14
15#if STARTTLS
16# include <openssl/err.h>
17# include <openssl/bio.h>
18# include <openssl/pem.h>
19# ifndef HASURANDOMDEV
20# include <openssl/rand.h>
21# endif /* ! HASURANDOMDEV */
22# if !TLS_NO_RSA
23static RSA *rsa_tmp = NULL; /* temporary RSA key */
24static RSA *tmp_rsa_key __P((SSL *, int, int));
25# endif /* !TLS_NO_RSA */
26# if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L
27static int tls_verify_cb __P((X509_STORE_CTX *));
28# else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */
29static int tls_verify_cb __P((X509_STORE_CTX *, void *));
30# endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */
31
32# if OPENSSL_VERSION_NUMBER > 0x00907000L
33static int x509_verify_cb __P((int, X509_STORE_CTX *));
34# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */
35
36# if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L
37# define CONST097
38# else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */
39# define CONST097 const
40# endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */
41static void apps_ssl_info_cb __P((CONST097 SSL *, int , int));
42static bool tls_ok_f __P((char *, char *, int));
43static bool tls_safe_f __P((char *, long, bool));
44static int tls_verify_log __P((int, X509_STORE_CTX *, char *));
45
46# if !NO_DH
47static DH *get_dh512 __P((void));
48
49static unsigned char dh512_p[] =
50{
51 0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75,
52 0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F,
53 0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3,
54 0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12,
55 0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C,
56 0x47,0x74,0xE8,0x33
57};
58static unsigned char dh512_g[] =
59{
60 0x02
61};
62
63static DH *
64get_dh512()
65{
66 DH *dh = NULL;
67
68 if ((dh = DH_new()) == NULL)
69 return NULL;
70 dh->p = BN_bin2bn(dh512_p, sizeof(dh512_p), NULL);
71 dh->g = BN_bin2bn(dh512_g, sizeof(dh512_g), NULL);
72 if ((dh->p == NULL) || (dh->g == NULL))
73 return NULL;
74 return dh;
75}
76# endif /* !NO_DH */
77
78
79/*
80** TLS_RAND_INIT -- initialize STARTTLS random generator
81**
82** Parameters:
83** randfile -- name of file with random data
84** logl -- loglevel
85**
86** Returns:
87** success/failure
88**
89** Side Effects:
90** initializes PRNG for tls library.
91*/
92
93# define MIN_RAND_BYTES 128 /* 1024 bits */
94
95# define RF_OK 0 /* randfile OK */
96# define RF_MISS 1 /* randfile == NULL || *randfile == '\0' */
97# define RF_UNKNOWN 2 /* unknown prefix for randfile */
98
99# define RI_NONE 0 /* no init yet */
100# define RI_SUCCESS 1 /* init was successful */
101# define RI_FAIL 2 /* init failed */
102
103static bool tls_rand_init __P((char *, int));
104
105static bool
106tls_rand_init(randfile, logl)
107 char *randfile;
108 int logl;
109{
110# ifndef HASURANDOMDEV
111 /* not required if /dev/urandom exists, OpenSSL does it internally */
112
113 bool ok;
114 int randdef;
115 static int done = RI_NONE;
116
117 /*
118 ** initialize PRNG
119 */
120
121 /* did we try this before? if yes: return old value */
122 if (done != RI_NONE)
123 return done == RI_SUCCESS;
124
125 /* set default values */
126 ok = false;
127 done = RI_FAIL;
128 randdef = (randfile == NULL || *randfile == '\0') ? RF_MISS : RF_OK;
129# if EGD
130 if (randdef == RF_OK && sm_strncasecmp(randfile, "egd:", 4) == 0)
131 {
132 randfile += 4;
133 if (RAND_egd(randfile) < 0)
134 {
135 sm_syslog(LOG_WARNING, NOQID,
136 "STARTTLS: RAND_egd(%s) failed: random number generator not seeded",
137 randfile);
138 }
139 else
140 ok = true;
141 }
142 else
143# endif /* EGD */
144 if (randdef == RF_OK && sm_strncasecmp(randfile, "file:", 5) == 0)
145 {
146 int fd;
147 long sff;
148 struct stat st;
149
150 randfile += 5;
151 sff = SFF_SAFEDIRPATH | SFF_NOWLINK
152 | SFF_NOGWFILES | SFF_NOWWFILES
153 | SFF_NOGRFILES | SFF_NOWRFILES
154 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT;
155 if (DontLockReadFiles)
156 sff |= SFF_NOLOCK;
157 if ((fd = safeopen(randfile, O_RDONLY, 0, sff)) >= 0)
158 {
159 if (fstat(fd, &st) < 0)
160 {
161 if (LogLevel > logl)
162 sm_syslog(LOG_ERR, NOQID,
163 "STARTTLS: can't fstat(%s)",
164 randfile);
165 }
166 else
167 {
168 bool use, problem;
169
170 use = true;
171 problem = false;
172
173 /* max. age of file: 10 minutes */
174 if (st.st_mtime + 600 < curtime())
175 {
176 use = bitnset(DBS_INSUFFICIENTENTROPY,
177 DontBlameSendmail);
178 problem = true;
179 if (LogLevel > logl)
180 sm_syslog(LOG_ERR, NOQID,
181 "STARTTLS: RandFile %s too old: %s",
182 randfile,
183 use ? "unsafe" :
184 "unusable");
185 }
186 if (use && st.st_size < MIN_RAND_BYTES)
187 {
188 use = bitnset(DBS_INSUFFICIENTENTROPY,
189 DontBlameSendmail);
190 problem = true;
191 if (LogLevel > logl)
192 sm_syslog(LOG_ERR, NOQID,
193 "STARTTLS: size(%s) < %d: %s",
194 randfile,
195 MIN_RAND_BYTES,
196 use ? "unsafe" :
197 "unusable");
198 }
199 if (use)
200 ok = RAND_load_file(randfile, -1) >=
201 MIN_RAND_BYTES;
202 if (use && !ok)
203 {
204 if (LogLevel > logl)
205 sm_syslog(LOG_WARNING, NOQID,
206 "STARTTLS: RAND_load_file(%s) failed: random number generator not seeded",
207 randfile);
208 }
209 if (problem)
210 ok = false;
211 }
212 if (ok || bitnset(DBS_INSUFFICIENTENTROPY,
213 DontBlameSendmail))
214 {
215 /* add this even if fstat() failed */
216 RAND_seed((void *) &st, sizeof st);
217 }
218 (void) close(fd);
219 }
220 else
221 {
222 if (LogLevel > logl)
223 sm_syslog(LOG_WARNING, NOQID,
224 "STARTTLS: Warning: safeopen(%s) failed",
225 randfile);
226 }
227 }
228 else if (randdef == RF_OK)
229 {
230 if (LogLevel > logl)
231 sm_syslog(LOG_WARNING, NOQID,
232 "STARTTLS: Error: no proper random file definition %s",
233 randfile);
234 randdef = RF_UNKNOWN;
235 }
236 if (randdef == RF_MISS)
237 {
238 if (LogLevel > logl)
239 sm_syslog(LOG_WARNING, NOQID,
240 "STARTTLS: Error: missing random file definition");
241 }
242 if (!ok && bitnset(DBS_INSUFFICIENTENTROPY, DontBlameSendmail))
243 {
244 int i;
245 long r;
246 unsigned char buf[MIN_RAND_BYTES];
247
248 /* assert((MIN_RAND_BYTES % sizeof(long)) == 0); */
249 for (i = 0; i <= sizeof(buf) - sizeof(long); i += sizeof(long))
250 {
251 r = get_random();
252 (void) memcpy(buf + i, (void *) &r, sizeof(long));
253 }
254 RAND_seed(buf, sizeof buf);
255 if (LogLevel > logl)
256 sm_syslog(LOG_WARNING, NOQID,
257 "STARTTLS: Warning: random number generator not properly seeded");
258 ok = true;
259 }
260 done = ok ? RI_SUCCESS : RI_FAIL;
261 return ok;
262# else /* ! HASURANDOMDEV */
263 return true;
264# endif /* ! HASURANDOMDEV */
265}
266/*
267** INIT_TLS_LIBRARY -- Calls functions which setup TLS library for global use.
268**
269** Parameters:
270** none.
271**
272** Returns:
273** succeeded?
274*/
275
276bool
277init_tls_library()
278{
279 /* basic TLS initialization, ignore result for now */
280 SSL_library_init();
281 SSL_load_error_strings();
282# if 0
283 /* this is currently a macro for SSL_library_init */
284 SSLeay_add_ssl_algorithms();
285# endif /* 0 */
286
287 return tls_rand_init(RandFile, 7);
288}
289/*
290** TLS_SET_VERIFY -- request client certificate?
291**
292** Parameters:
293** ctx -- TLS context
294** ssl -- TLS structure
295** vrfy -- require certificate?
296**
297** Returns:
298** none.
299**
300** Side Effects:
301** Sets verification state for TLS
302**
303# if TLS_VRFY_PER_CTX
304** Notice:
305** This is per TLS context, not per TLS structure;
306** the former is global, the latter per connection.
307** It would be nice to do this per connection, but this
308** doesn't work in the current TLS libraries :-(
309# endif * TLS_VRFY_PER_CTX *
310*/
311
312void
313tls_set_verify(ctx, ssl, vrfy)
314 SSL_CTX *ctx;
315 SSL *ssl;
316 bool vrfy;
317{
318# if !TLS_VRFY_PER_CTX
319 SSL_set_verify(ssl, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, NULL);
320# else /* !TLS_VRFY_PER_CTX */
321 SSL_CTX_set_verify(ctx, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE,
322 NULL);
323# endif /* !TLS_VRFY_PER_CTX */
324}
325
326/*
327** status in initialization
328** these flags keep track of the status of the initialization
329** i.e., whether a file exists (_EX) and whether it can be used (_OK)
330** [due to permissions]
331*/
332
333# define TLS_S_NONE 0x00000000 /* none yet */
334# define TLS_S_CERT_EX 0x00000001 /* cert file exists */
335# define TLS_S_CERT_OK 0x00000002 /* cert file is ok */
336# define TLS_S_KEY_EX 0x00000004 /* key file exists */
337# define TLS_S_KEY_OK 0x00000008 /* key file is ok */
338# define TLS_S_CERTP_EX 0x00000010 /* CA cert path exists */
339# define TLS_S_CERTP_OK 0x00000020 /* CA cert path is ok */
340# define TLS_S_CERTF_EX 0x00000040 /* CA cert file exists */
341# define TLS_S_CERTF_OK 0x00000080 /* CA cert file is ok */
342# define TLS_S_CRLF_EX 0x00000100 /* CRL file exists */
343# define TLS_S_CRLF_OK 0x00000200 /* CRL file is ok */
344
345# if _FFR_TLS_1
346# define TLS_S_CERT2_EX 0x00001000 /* 2nd cert file exists */
347# define TLS_S_CERT2_OK 0x00002000 /* 2nd cert file is ok */
348# define TLS_S_KEY2_EX 0x00004000 /* 2nd key file exists */
349# define TLS_S_KEY2_OK 0x00008000 /* 2nd key file is ok */
350# endif /* _FFR_TLS_1 */
351
352# define TLS_S_DH_OK 0x00200000 /* DH cert is ok */
353# define TLS_S_DHPAR_EX 0x00400000 /* DH param file exists */
354# define TLS_S_DHPAR_OK 0x00800000 /* DH param file is ok to use */
355
356/* Type of variable */
357# define TLS_T_OTHER 0
358# define TLS_T_SRV 1
359# define TLS_T_CLT 2
360
361/*
362** TLS_OK_F -- can var be an absolute filename?
363**
364** Parameters:
365** var -- filename
366** fn -- what is the filename used for?
367** type -- type of variable
368**
369** Returns:
370** ok?
371*/
372
373static bool
374tls_ok_f(var, fn, type)
375 char *var;
376 char *fn;
377 int type;
378{
379 /* must be absolute pathname */
380 if (var != NULL && *var == '/')
381 return true;
382 if (LogLevel > 12)
383 sm_syslog(LOG_WARNING, NOQID, "STARTTLS: %s%s missing",
384 type == TLS_T_SRV ? "Server" :
385 (type == TLS_T_CLT ? "Client" : ""), fn);
386 return false;
387}
388/*
389** TLS_SAFE_F -- is a file safe to use?
390**
391** Parameters:
392** var -- filename
393** sff -- flags for safefile()
394** srv -- server side?
395**
396** Returns:
397** ok?
398*/
399
400static bool
401tls_safe_f(var, sff, srv)
402 char *var;
403 long sff;
404 bool srv;
405{
406 int ret;
407
408 if ((ret = safefile(var, RunAsUid, RunAsGid, RunAsUserName, sff,
409 S_IRUSR, NULL)) == 0)
410 return true;
411 if (LogLevel > 7)
412 sm_syslog(LOG_WARNING, NOQID, "STARTTLS=%s: file %s unsafe: %s",
413 srv ? "server" : "client", var, sm_errstring(ret));
414 return false;
415}
416
417/*
418** TLS_OK_F -- macro to simplify calls to tls_ok_f
419**
420** Parameters:
421** var -- filename
422** fn -- what is the filename used for?
423** req -- is the file required?
424** st -- status bit to set if ok
425** type -- type of variable
426**
427** Side Effects:
428** uses r, ok; may change ok and status.
429**
430*/
431
432# define TLS_OK_F(var, fn, req, st, type) if (ok) \
433 { \
434 r = tls_ok_f(var, fn, type); \
435 if (r) \
436 status |= st; \
437 else if (req) \
438 ok = false; \
439 }
440
441/*
442** TLS_UNR -- macro to return whether a file should be unreadable
443**
444** Parameters:
445** bit -- flag to test
446** req -- flags
447**
448** Returns:
449** 0/SFF_NORFILES
450*/
451# define TLS_UNR(bit, req) (bitset(bit, req) ? SFF_NORFILES : 0)
452# define TLS_OUNR(bit, req) (bitset(bit, req) ? SFF_NOWRFILES : 0)
453# define TLS_KEYSFF(req) \
454 (bitnset(DBS_GROUPREADABLEKEYFILE, DontBlameSendmail) ? \
455 TLS_OUNR(TLS_I_KEY_OUNR, req) : \
456 TLS_UNR(TLS_I_KEY_UNR, req))
457
458/*
459** TLS_SAFE_F -- macro to simplify calls to tls_safe_f
460**
461** Parameters:
462** var -- filename
463** sff -- flags for safefile()
464** req -- is the file required?
465** ex -- does the file exist?
466** st -- status bit to set if ok
467** srv -- server side?
468**
469** Side Effects:
470** uses r, ok, ex; may change ok and status.
471**
472*/
473
474# define TLS_SAFE_F(var, sff, req, ex, st, srv) if (ex && ok) \
475 { \
476 r = tls_safe_f(var, sff, srv); \
477 if (r) \
478 status |= st; \
479 else if (req) \
480 ok = false; \
481 }
482
483/*
484** INITTLS -- initialize TLS
485**
486** Parameters:
487** ctx -- pointer to context
488** req -- requirements for initialization (see sendmail.h)
489** srv -- server side?
490** certfile -- filename of certificate
491** keyfile -- filename of private key
492** cacertpath -- path to CAs
493** cacertfile -- file with CA(s)
494** dhparam -- parameters for DH
495**
496** Returns:
497** succeeded?
498*/
499
500bool
501inittls(ctx, req, srv, certfile, keyfile, cacertpath, cacertfile, dhparam)
502 SSL_CTX **ctx;
503 unsigned long req;
504 bool srv;
505 char *certfile, *keyfile, *cacertpath, *cacertfile, *dhparam;
506{
507# if !NO_DH
508 static DH *dh = NULL;
509# endif /* !NO_DH */
510 int r;
511 bool ok;
512 long sff, status;
513 char *who;
514# if _FFR_TLS_1
515 char *cf2, *kf2;
516# endif /* _FFR_TLS_1 */
517# if SM_CONF_SHM
518 extern int ShmId;
519# endif /* SM_CONF_SHM */
520# if OPENSSL_VERSION_NUMBER > 0x00907000L
521 BIO *crl_file;
522 X509_CRL *crl;
523 X509_STORE *store;
524# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */
525
526 status = TLS_S_NONE;
527 who = srv ? "server" : "client";
528 if (ctx == NULL)
529 syserr("STARTTLS=%s, inittls: ctx == NULL", who);
530
531 /* already initialized? (we could re-init...) */
532 if (*ctx != NULL)
533 return true;
534 ok = true;
535
536# if _FFR_TLS_1
537 /*
538 ** look for a second filename: it must be separated by a ','
539 ** no blanks allowed (they won't be skipped).
540 ** we change a global variable here! this change will be undone
541 ** before return from the function but only if it returns true.
542 ** this isn't a problem since in a failure case this function
543 ** won't be called again with the same (overwritten) values.
544 ** otherwise each return must be replaced with a goto endinittls.
545 */
546
547 cf2 = NULL;
548 kf2 = NULL;
549 if (certfile != NULL && (cf2 = strchr(certfile, ',')) != NULL)
550 {
551 *cf2++ = '\0';
552 if (keyfile != NULL && (kf2 = strchr(keyfile, ',')) != NULL)
553 *kf2++ = '\0';
554 }
555# endif /* _FFR_TLS_1 */
556
557 /*
558 ** Check whether files/paths are defined
559 */
560
561 TLS_OK_F(certfile, "CertFile", bitset(TLS_I_CERT_EX, req),
562 TLS_S_CERT_EX, srv ? TLS_T_SRV : TLS_T_CLT);
563 TLS_OK_F(keyfile, "KeyFile", bitset(TLS_I_KEY_EX, req),
564 TLS_S_KEY_EX, srv ? TLS_T_SRV : TLS_T_CLT);
565 TLS_OK_F(cacertpath, "CACertPath", bitset(TLS_I_CERTP_EX, req),
566 TLS_S_CERTP_EX, TLS_T_OTHER);
567 TLS_OK_F(cacertfile, "CACertFile", bitset(TLS_I_CERTF_EX, req),
568 TLS_S_CERTF_EX, TLS_T_OTHER);
569
570# if OPENSSL_VERSION_NUMBER > 0x00907000L
571 TLS_OK_F(CRLFile, "CRLFile", bitset(TLS_I_CRLF_EX, req),
572 TLS_S_CRLF_EX, TLS_T_OTHER);
573# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */
574
575# if _FFR_TLS_1
576 /*
577 ** if the second file is specified it must exist
578 ** XXX: it is possible here to define only one of those files
579 */
580
581 if (cf2 != NULL)
582 {
583 TLS_OK_F(cf2, "CertFile", bitset(TLS_I_CERT_EX, req),
584 TLS_S_CERT2_EX, srv ? TLS_T_SRV : TLS_T_CLT);
585 }
586 if (kf2 != NULL)
587 {
588 TLS_OK_F(kf2, "KeyFile", bitset(TLS_I_KEY_EX, req),
589 TLS_S_KEY2_EX, srv ? TLS_T_SRV : TLS_T_CLT);
590 }
591# endif /* _FFR_TLS_1 */
592
593 /*
594 ** valid values for dhparam are (only the first char is checked)
595 ** none no parameters: don't use DH
596 ** 512 generate 512 bit parameters (fixed)
597 ** 1024 generate 1024 bit parameters
598 ** /file/name read parameters from /file/name
599 ** default is: 1024 for server, 512 for client (OK? XXX)
600 */
601
602 if (bitset(TLS_I_TRY_DH, req))
603 {
604 if (dhparam != NULL)
605 {
606 char c = *dhparam;
607
608 if (c == '1')
609 req |= TLS_I_DH1024;
610 else if (c == '5')
611 req |= TLS_I_DH512;
612 else if (c != 'n' && c != 'N' && c != '/')
613 {
614 if (LogLevel > 12)
615 sm_syslog(LOG_WARNING, NOQID,
616 "STARTTLS=%s, error: illegal value '%s' for DHParam",
617 who, dhparam);
618 dhparam = NULL;
619 }
620 }
621 if (dhparam == NULL)
622 dhparam = srv ? "1" : "5";
623 else if (*dhparam == '/')
624 {
625 TLS_OK_F(dhparam, "DHParameters",
626 bitset(TLS_I_DHPAR_EX, req),
627 TLS_S_DHPAR_EX, TLS_T_OTHER);
628 }
629 }
630 if (!ok)
631 return ok;
632
633 /* certfile etc. must be "safe". */
634 sff = SFF_REGONLY | SFF_SAFEDIRPATH | SFF_NOWLINK
635 | SFF_NOGWFILES | SFF_NOWWFILES
636 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT;
637 if (DontLockReadFiles)
638 sff |= SFF_NOLOCK;
639
640 TLS_SAFE_F(certfile, sff | TLS_UNR(TLS_I_CERT_UNR, req),
641 bitset(TLS_I_CERT_EX, req),
642 bitset(TLS_S_CERT_EX, status), TLS_S_CERT_OK, srv);
643 TLS_SAFE_F(keyfile, sff | TLS_KEYSFF(req),
644 bitset(TLS_I_KEY_EX, req),
645 bitset(TLS_S_KEY_EX, status), TLS_S_KEY_OK, srv);
646 TLS_SAFE_F(cacertfile, sff | TLS_UNR(TLS_I_CERTF_UNR, req),
647 bitset(TLS_I_CERTF_EX, req),
648 bitset(TLS_S_CERTF_EX, status), TLS_S_CERTF_OK, srv);
649 TLS_SAFE_F(dhparam, sff | TLS_UNR(TLS_I_DHPAR_UNR, req),
650 bitset(TLS_I_DHPAR_EX, req),
651 bitset(TLS_S_DHPAR_EX, status), TLS_S_DHPAR_OK, srv);
652# if OPENSSL_VERSION_NUMBER > 0x00907000L
653 TLS_SAFE_F(CRLFile, sff | TLS_UNR(TLS_I_CRLF_UNR, req),
654 bitset(TLS_I_CRLF_EX, req),
655 bitset(TLS_S_CRLF_EX, status), TLS_S_CRLF_OK, srv);
656# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */
657 if (!ok)
658 return ok;
659# if _FFR_TLS_1
660 if (cf2 != NULL)
661 {
662 TLS_SAFE_F(cf2, sff | TLS_UNR(TLS_I_CERT_UNR, req),
663 bitset(TLS_I_CERT_EX, req),
664 bitset(TLS_S_CERT2_EX, status), TLS_S_CERT2_OK, srv);
665 }
666 if (kf2 != NULL)
667 {
668 TLS_SAFE_F(kf2, sff | TLS_KEYSFF(req),
669 bitset(TLS_I_KEY_EX, req),
670 bitset(TLS_S_KEY2_EX, status), TLS_S_KEY2_OK, srv);
671 }
672# endif /* _FFR_TLS_1 */
673
674 /* create a method and a new context */
675 if ((*ctx = SSL_CTX_new(srv ? SSLv23_server_method() :
676 SSLv23_client_method())) == NULL)
677 {
678 if (LogLevel > 7)
679 sm_syslog(LOG_WARNING, NOQID,
680 "STARTTLS=%s, error: SSL_CTX_new(SSLv23_%s_method()) failed",
681 who, who);
682 if (LogLevel > 9)
683 tlslogerr(who);
684 return false;
685 }
686
687# if OPENSSL_VERSION_NUMBER > 0x00907000L
688 if (CRLFile != NULL)
689 {
690 /* get a pointer to the current certificate validation store */
691 store = SSL_CTX_get_cert_store(*ctx); /* does not fail */
692 crl_file = BIO_new(BIO_s_file_internal());
693 if (crl_file != NULL)
694 {
695 if (BIO_read_filename(crl_file, CRLFile) >= 0)
696 {
697 crl = PEM_read_bio_X509_CRL(crl_file, NULL,
698 NULL, NULL);
699 BIO_free(crl_file);
700 X509_STORE_add_crl(store, crl);
701 X509_CRL_free(crl);
702 X509_STORE_set_flags(store,
703 X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL);
704 X509_STORE_set_verify_cb_func(store,
705 x509_verify_cb);
706 }
707 else
708 {
709 if (LogLevel > 9)
710 {
711 sm_syslog(LOG_WARNING, NOQID,
712 "STARTTLS=%s, error: PEM_read_bio_X509_CRL(%s)=failed",
713 who, CRLFile);
714 }
715
716 /* avoid memory leaks */
717 BIO_free(crl_file);
718 return false;
719 }
720
721 }
722 else if (LogLevel > 9)
723 sm_syslog(LOG_WARNING, NOQID,
724 "STARTTLS=%s, error: BIO_new=failed", who);
725 }
726# if _FFR_CRLPATH
727 if (CRLPath != NULL)
728 {
729 X509_LOOKUP *lookup;
730
731 lookup = X509_STORE_add_lookup(store, X509_LOOKUP_hash_dir());
732 if (lookup == NULL)
733 {
734 if (LogLevel > 9)
735 {
736 sm_syslog(LOG_WARNING, NOQID,
737 "STARTTLS=%s, error: X509_STORE_add_lookup(hash)=failed",
738 who, CRLFile);
739 }
740 return false;
741 }
742 X509_LOOKUP_add_dir(lookup, CRLPath, X509_FILETYPE_PEM);
743 X509_STORE_set_flags(store,
744 X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL);
745 }
746# endif /* _FFR_CRLPATH */
747# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */
748
749# if TLS_NO_RSA
750 /* turn off backward compatibility, required for no-rsa */
751 SSL_CTX_set_options(*ctx, SSL_OP_NO_SSLv2);
752# endif /* TLS_NO_RSA */
753
754
755# if !TLS_NO_RSA
756 /*
757 ** Create a temporary RSA key
758 ** XXX Maybe we shouldn't create this always (even though it
759 ** is only at startup).
760 ** It is a time-consuming operation and it is not always necessary.
761 ** maybe we should do it only on demand...
762 */
763
764 if (bitset(TLS_I_RSA_TMP, req)
765# if SM_CONF_SHM
766 && ShmId != SM_SHM_NO_ID &&
767 (rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL,
768 NULL)) == NULL
769# else /* SM_CONF_SHM */
770 && 0 /* no shared memory: no need to generate key now */
771# endif /* SM_CONF_SHM */
772 )
773 {
774 if (LogLevel > 7)
775 {
776 sm_syslog(LOG_WARNING, NOQID,
777 "STARTTLS=%s, error: RSA_generate_key failed",
778 who);
779 if (LogLevel > 9)
780 tlslogerr(who);
781 }
782 return false;
783 }
784# endif /* !TLS_NO_RSA */
785
786 /*
787 ** load private key
788 ** XXX change this for DSA-only version
789 */
790
791 if (bitset(TLS_S_KEY_OK, status) &&
792 SSL_CTX_use_PrivateKey_file(*ctx, keyfile,
793 SSL_FILETYPE_PEM) <= 0)
794 {
795 if (LogLevel > 7)
796 {
797 sm_syslog(LOG_WARNING, NOQID,
798 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed",
799 who, keyfile);
800 if (LogLevel > 9)
801 tlslogerr(who);
802 }
803 if (bitset(TLS_I_USE_KEY, req))
804 return false;
805 }
806
807 /* get the certificate file */
808 if (bitset(TLS_S_CERT_OK, status) &&
809 SSL_CTX_use_certificate_file(*ctx, certfile,
810 SSL_FILETYPE_PEM) <= 0)
811 {
812 if (LogLevel > 7)
813 {
814 sm_syslog(LOG_WARNING, NOQID,
815 "STARTTLS=%s, error: SSL_CTX_use_certificate_file(%s) failed",
816 who, certfile);
817 if (LogLevel > 9)
818 tlslogerr(who);
819 }
820 if (bitset(TLS_I_USE_CERT, req))
821 return false;
822 }
823
824 /* check the private key */
825 if (bitset(TLS_S_KEY_OK, status) &&
826 (r = SSL_CTX_check_private_key(*ctx)) <= 0)
827 {
828 /* Private key does not match the certificate public key */
829 if (LogLevel > 5)
830 {
831 sm_syslog(LOG_WARNING, NOQID,
832 "STARTTLS=%s, error: SSL_CTX_check_private_key failed(%s): %d",
833 who, keyfile, r);
834 if (LogLevel > 9)
835 tlslogerr(who);
836 }
837 if (bitset(TLS_I_USE_KEY, req))
838 return false;
839 }
840
841# if _FFR_TLS_1
842 /* XXX this code is pretty much duplicated from above! */
843
844 /* load private key */
845 if (bitset(TLS_S_KEY2_OK, status) &&
846 SSL_CTX_use_PrivateKey_file(*ctx, kf2, SSL_FILETYPE_PEM) <= 0)
847 {
848 if (LogLevel > 7)
849 {
850 sm_syslog(LOG_WARNING, NOQID,
851 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed",
852 who, kf2);
853 if (LogLevel > 9)
854 tlslogerr(who);
855 }
856 }
857
858 /* get the certificate file */
859 if (bitset(TLS_S_CERT2_OK, status) &&
860 SSL_CTX_use_certificate_file(*ctx, cf2, SSL_FILETYPE_PEM) <= 0)
861 {
862 if (LogLevel > 7)
863 {
864 sm_syslog(LOG_WARNING, NOQID,
865 "STARTTLS=%s, error: SSL_CTX_use_certificate_file(%s) failed",
866 who, cf2);
867 if (LogLevel > 9)
868 tlslogerr(who);
869 }
870 }
871
872 /* also check the private key */
873 if (bitset(TLS_S_KEY2_OK, status) &&
874 (r = SSL_CTX_check_private_key(*ctx)) <= 0)
875 {
876 /* Private key does not match the certificate public key */
877 if (LogLevel > 5)
878 {
879 sm_syslog(LOG_WARNING, NOQID,
880 "STARTTLS=%s, error: SSL_CTX_check_private_key 2 failed: %d",
881 who, r);
882 if (LogLevel > 9)
883 tlslogerr(who);
884 }
885 }
886# endif /* _FFR_TLS_1 */
887
888 /* SSL_CTX_set_quiet_shutdown(*ctx, 1); violation of standard? */
889 SSL_CTX_set_options(*ctx, SSL_OP_ALL); /* XXX bug compatibility? */
890
891# if !NO_DH
892 /* Diffie-Hellman initialization */
893 if (bitset(TLS_I_TRY_DH, req))
894 {
895 if (bitset(TLS_S_DHPAR_OK, status))
896 {
897 BIO *bio;
898
899 if ((bio = BIO_new_file(dhparam, "r")) != NULL)
900 {
901 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
902 BIO_free(bio);
903 if (dh == NULL && LogLevel > 7)
904 {
905 unsigned long err;
906
907 err = ERR_get_error();
908 sm_syslog(LOG_WARNING, NOQID,
909 "STARTTLS=%s, error: cannot read DH parameters(%s): %s",
910 who, dhparam,
911 ERR_error_string(err, NULL));
912 if (LogLevel > 9)
913 tlslogerr(who);
914 }
915 }
916 else
917 {
918 if (LogLevel > 5)
919 {
920 sm_syslog(LOG_WARNING, NOQID,
921 "STARTTLS=%s, error: BIO_new_file(%s) failed",
922 who, dhparam);
923 if (LogLevel > 9)
924 tlslogerr(who);
925 }
926 }
927 }
928 if (dh == NULL && bitset(TLS_I_DH1024, req))
929 {
930 DSA *dsa;
931
932 /* this takes a while! (7-130s on a 450MHz AMD K6-2) */
933 dsa = DSA_generate_parameters(1024, NULL, 0, NULL,
934 NULL, 0, NULL);
935 dh = DSA_dup_DH(dsa);
936 DSA_free(dsa);
937 }
938 else
939 if (dh == NULL && bitset(TLS_I_DH512, req))
940 dh = get_dh512();
941
942 if (dh == NULL)
943 {
944 if (LogLevel > 9)
945 {
946 unsigned long err;
947
948 err = ERR_get_error();
949 sm_syslog(LOG_WARNING, NOQID,
950 "STARTTLS=%s, error: cannot read or set DH parameters(%s): %s",
951 who, dhparam,
952 ERR_error_string(err, NULL));
953 }
954 if (bitset(TLS_I_REQ_DH, req))
955 return false;
956 }
957 else
958 {
959 SSL_CTX_set_tmp_dh(*ctx, dh);
960
961 /* important to avoid small subgroup attacks */
962 SSL_CTX_set_options(*ctx, SSL_OP_SINGLE_DH_USE);
963 if (LogLevel > 13)
964 sm_syslog(LOG_INFO, NOQID,
965 "STARTTLS=%s, Diffie-Hellman init, key=%d bit (%c)",
966 who, 8 * DH_size(dh), *dhparam);
967 DH_free(dh);
968 }
969 }
970# endif /* !NO_DH */
971
972
973 /* XXX do we need this cache here? */
974 if (bitset(TLS_I_CACHE, req))
975 SSL_CTX_sess_set_cache_size(*ctx, 128);
976 /* timeout? SSL_CTX_set_timeout(*ctx, TimeOut...); */
977
978 /* load certificate locations and default CA paths */
979 if (bitset(TLS_S_CERTP_EX, status) && bitset(TLS_S_CERTF_EX, status))
980 {
981 if ((r = SSL_CTX_load_verify_locations(*ctx, cacertfile,
982 cacertpath)) == 1)
983 {
984# if !TLS_NO_RSA
985 if (bitset(TLS_I_RSA_TMP, req))
986 SSL_CTX_set_tmp_rsa_callback(*ctx, tmp_rsa_key);
987# endif /* !TLS_NO_RSA */
988
989 /*
990 ** We have to install our own verify callback:
991 ** SSL_VERIFY_PEER requests a client cert but even
992 ** though *FAIL_IF* isn't set, the connection
993 ** will be aborted if the client presents a cert
994 ** that is not "liked" (can't be verified?) by
995 ** the TLS library :-(
996 */
997
998 /*
999 ** XXX currently we could call tls_set_verify()
1000 ** but we hope that that function will later on
1001 ** only set the mode per connection.
1002 */
1003 SSL_CTX_set_verify(*ctx,
1004 bitset(TLS_I_NO_VRFY, req) ? SSL_VERIFY_NONE
1005 : SSL_VERIFY_PEER,
1006 NULL);
1007
1008 /* install verify callback */
1009 SSL_CTX_set_cert_verify_callback(*ctx, tls_verify_cb,
1010 NULL);
1011 SSL_CTX_set_client_CA_list(*ctx,
1012 SSL_load_client_CA_file(cacertfile));
1013 }
1014 else
1015 {
1016 /*
1017 ** can't load CA data; do we care?
1018 ** the data is necessary to authenticate the client,
1019 ** which in turn would be necessary
1020 ** if we want to allow relaying based on it.
1021 */
1022 if (LogLevel > 5)
1023 {
1024 sm_syslog(LOG_WARNING, NOQID,
1025 "STARTTLS=%s, error: load verify locs %s, %s failed: %d",
1026 who, cacertpath, cacertfile, r);
1027 if (LogLevel > 9)
1028 tlslogerr(who);
1029 }
1030 if (bitset(TLS_I_VRFY_LOC, req))
1031 return false;
1032 }
1033 }
1034
1035 /* XXX: make this dependent on an option? */
1036 if (tTd(96, 9))
1037 SSL_CTX_set_info_callback(*ctx, apps_ssl_info_cb);
1038
1039# if _FFR_TLS_1
1040 /* install our own cipher list */
1041 if (CipherList != NULL && *CipherList != '\0')
1042 {
1043 if (SSL_CTX_set_cipher_list(*ctx, CipherList) <= 0)
1044 {
1045 if (LogLevel > 7)
1046 {
1047 sm_syslog(LOG_WARNING, NOQID,
1048 "STARTTLS=%s, error: SSL_CTX_set_cipher_list(%s) failed, list ignored",
1049 who, CipherList);
1050
1051 if (LogLevel > 9)
1052 tlslogerr(who);
1053 }
1054 /* failure if setting to this list is required? */
1055 }
1056 }
1057# endif /* _FFR_TLS_1 */
1058 if (LogLevel > 12)
1059 sm_syslog(LOG_INFO, NOQID, "STARTTLS=%s, init=%d", who, ok);
1060
1061# if _FFR_TLS_1
1062# if 0
1063 /*
1064 ** this label is required if we want to have a "clean" exit
1065 ** see the comments above at the initialization of cf2
1066 */
1067
1068 endinittls:
1069# endif /* 0 */
1070
1071 /* undo damage to global variables */
1072 if (cf2 != NULL)
1073 *--cf2 = ',';
1074 if (kf2 != NULL)
1075 *--kf2 = ',';
1076# endif /* _FFR_TLS_1 */
1077
1078 return ok;
1079}
1080/*
1081** TLS_GET_INFO -- get information about TLS connection
1082**
1083** Parameters:
1084** ssl -- TLS connection structure
1085** srv -- server or client
1086** host -- hostname of other side
1087** mac -- macro storage
1088** certreq -- did we ask for a cert?
1089**
1090** Returns:
1091** result of authentication.
1092**
1093** Side Effects:
1094** sets macros: {cipher}, {tls_version}, {verify},
1095** {cipher_bits}, {alg_bits}, {cert}, {cert_subject},
1096** {cert_issuer}, {cn_subject}, {cn_issuer}
1097*/
1098
1099int
1100tls_get_info(ssl, srv, host, mac, certreq)
1101 SSL *ssl;
1102 bool srv;
1103 char *host;
1104 MACROS_T *mac;
1105 bool certreq;
1106{
1107 SSL_CIPHER *c;
1108 int b, r;
1109 long verifyok;
1110 char *s, *who;
1111 char bitstr[16];
1112 X509 *cert;
1113
1114 c = SSL_get_current_cipher(ssl);
1115
1116 /* cast is just workaround for compiler warning */
1117 macdefine(mac, A_TEMP, macid("{cipher}"),
1118 (char *) SSL_CIPHER_get_name(c));
1119 b = SSL_CIPHER_get_bits(c, &r);
1120 (void) sm_snprintf(bitstr, sizeof bitstr, "%d", b);
1121 macdefine(mac, A_TEMP, macid("{cipher_bits}"), bitstr);
1122 (void) sm_snprintf(bitstr, sizeof bitstr, "%d", r);
1123 macdefine(mac, A_TEMP, macid("{alg_bits}"), bitstr);
1124 s = SSL_CIPHER_get_version(c);
1125 if (s == NULL)
1126 s = "UNKNOWN";
1127 macdefine(mac, A_TEMP, macid("{tls_version}"), s);
1128
1129 who = srv ? "server" : "client";
1130 cert = SSL_get_peer_certificate(ssl);
1131 verifyok = SSL_get_verify_result(ssl);
1132 if (LogLevel > 14)
1133 sm_syslog(LOG_INFO, NOQID,
1134 "STARTTLS=%s, get_verify: %ld get_peer: 0x%lx",
1135 who, verifyok, (unsigned long) cert);
1136 if (cert != NULL)
1137 {
1138 unsigned int n;
1139 unsigned char md[EVP_MAX_MD_SIZE];
1140 char buf[MAXNAME];
1141
1142 X509_NAME_oneline(X509_get_subject_name(cert),
1143 buf, sizeof buf);
1144 macdefine(mac, A_TEMP, macid("{cert_subject}"),
1145 xtextify(buf, "<>\")"));
1146 X509_NAME_oneline(X509_get_issuer_name(cert),
1147 buf, sizeof buf);
1148 macdefine(mac, A_TEMP, macid("{cert_issuer}"),
1149 xtextify(buf, "<>\")"));
1150 X509_NAME_get_text_by_NID(X509_get_subject_name(cert),
1151 NID_commonName, buf, sizeof buf);
1152 macdefine(mac, A_TEMP, macid("{cn_subject}"),
1153 xtextify(buf, "<>\")"));
1154 X509_NAME_get_text_by_NID(X509_get_issuer_name(cert),
1155 NID_commonName, buf, sizeof buf);
1156 macdefine(mac, A_TEMP, macid("{cn_issuer}"),
1157 xtextify(buf, "<>\")"));
| 14
15#if STARTTLS
16# include <openssl/err.h>
17# include <openssl/bio.h>
18# include <openssl/pem.h>
19# ifndef HASURANDOMDEV
20# include <openssl/rand.h>
21# endif /* ! HASURANDOMDEV */
22# if !TLS_NO_RSA
23static RSA *rsa_tmp = NULL; /* temporary RSA key */
24static RSA *tmp_rsa_key __P((SSL *, int, int));
25# endif /* !TLS_NO_RSA */
26# if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L
27static int tls_verify_cb __P((X509_STORE_CTX *));
28# else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */
29static int tls_verify_cb __P((X509_STORE_CTX *, void *));
30# endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */
31
32# if OPENSSL_VERSION_NUMBER > 0x00907000L
33static int x509_verify_cb __P((int, X509_STORE_CTX *));
34# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */
35
36# if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L
37# define CONST097
38# else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */
39# define CONST097 const
40# endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */
41static void apps_ssl_info_cb __P((CONST097 SSL *, int , int));
42static bool tls_ok_f __P((char *, char *, int));
43static bool tls_safe_f __P((char *, long, bool));
44static int tls_verify_log __P((int, X509_STORE_CTX *, char *));
45
46# if !NO_DH
47static DH *get_dh512 __P((void));
48
49static unsigned char dh512_p[] =
50{
51 0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75,
52 0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F,
53 0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3,
54 0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12,
55 0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C,
56 0x47,0x74,0xE8,0x33
57};
58static unsigned char dh512_g[] =
59{
60 0x02
61};
62
63static DH *
64get_dh512()
65{
66 DH *dh = NULL;
67
68 if ((dh = DH_new()) == NULL)
69 return NULL;
70 dh->p = BN_bin2bn(dh512_p, sizeof(dh512_p), NULL);
71 dh->g = BN_bin2bn(dh512_g, sizeof(dh512_g), NULL);
72 if ((dh->p == NULL) || (dh->g == NULL))
73 return NULL;
74 return dh;
75}
76# endif /* !NO_DH */
77
78
79/*
80** TLS_RAND_INIT -- initialize STARTTLS random generator
81**
82** Parameters:
83** randfile -- name of file with random data
84** logl -- loglevel
85**
86** Returns:
87** success/failure
88**
89** Side Effects:
90** initializes PRNG for tls library.
91*/
92
93# define MIN_RAND_BYTES 128 /* 1024 bits */
94
95# define RF_OK 0 /* randfile OK */
96# define RF_MISS 1 /* randfile == NULL || *randfile == '\0' */
97# define RF_UNKNOWN 2 /* unknown prefix for randfile */
98
99# define RI_NONE 0 /* no init yet */
100# define RI_SUCCESS 1 /* init was successful */
101# define RI_FAIL 2 /* init failed */
102
103static bool tls_rand_init __P((char *, int));
104
105static bool
106tls_rand_init(randfile, logl)
107 char *randfile;
108 int logl;
109{
110# ifndef HASURANDOMDEV
111 /* not required if /dev/urandom exists, OpenSSL does it internally */
112
113 bool ok;
114 int randdef;
115 static int done = RI_NONE;
116
117 /*
118 ** initialize PRNG
119 */
120
121 /* did we try this before? if yes: return old value */
122 if (done != RI_NONE)
123 return done == RI_SUCCESS;
124
125 /* set default values */
126 ok = false;
127 done = RI_FAIL;
128 randdef = (randfile == NULL || *randfile == '\0') ? RF_MISS : RF_OK;
129# if EGD
130 if (randdef == RF_OK && sm_strncasecmp(randfile, "egd:", 4) == 0)
131 {
132 randfile += 4;
133 if (RAND_egd(randfile) < 0)
134 {
135 sm_syslog(LOG_WARNING, NOQID,
136 "STARTTLS: RAND_egd(%s) failed: random number generator not seeded",
137 randfile);
138 }
139 else
140 ok = true;
141 }
142 else
143# endif /* EGD */
144 if (randdef == RF_OK && sm_strncasecmp(randfile, "file:", 5) == 0)
145 {
146 int fd;
147 long sff;
148 struct stat st;
149
150 randfile += 5;
151 sff = SFF_SAFEDIRPATH | SFF_NOWLINK
152 | SFF_NOGWFILES | SFF_NOWWFILES
153 | SFF_NOGRFILES | SFF_NOWRFILES
154 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT;
155 if (DontLockReadFiles)
156 sff |= SFF_NOLOCK;
157 if ((fd = safeopen(randfile, O_RDONLY, 0, sff)) >= 0)
158 {
159 if (fstat(fd, &st) < 0)
160 {
161 if (LogLevel > logl)
162 sm_syslog(LOG_ERR, NOQID,
163 "STARTTLS: can't fstat(%s)",
164 randfile);
165 }
166 else
167 {
168 bool use, problem;
169
170 use = true;
171 problem = false;
172
173 /* max. age of file: 10 minutes */
174 if (st.st_mtime + 600 < curtime())
175 {
176 use = bitnset(DBS_INSUFFICIENTENTROPY,
177 DontBlameSendmail);
178 problem = true;
179 if (LogLevel > logl)
180 sm_syslog(LOG_ERR, NOQID,
181 "STARTTLS: RandFile %s too old: %s",
182 randfile,
183 use ? "unsafe" :
184 "unusable");
185 }
186 if (use && st.st_size < MIN_RAND_BYTES)
187 {
188 use = bitnset(DBS_INSUFFICIENTENTROPY,
189 DontBlameSendmail);
190 problem = true;
191 if (LogLevel > logl)
192 sm_syslog(LOG_ERR, NOQID,
193 "STARTTLS: size(%s) < %d: %s",
194 randfile,
195 MIN_RAND_BYTES,
196 use ? "unsafe" :
197 "unusable");
198 }
199 if (use)
200 ok = RAND_load_file(randfile, -1) >=
201 MIN_RAND_BYTES;
202 if (use && !ok)
203 {
204 if (LogLevel > logl)
205 sm_syslog(LOG_WARNING, NOQID,
206 "STARTTLS: RAND_load_file(%s) failed: random number generator not seeded",
207 randfile);
208 }
209 if (problem)
210 ok = false;
211 }
212 if (ok || bitnset(DBS_INSUFFICIENTENTROPY,
213 DontBlameSendmail))
214 {
215 /* add this even if fstat() failed */
216 RAND_seed((void *) &st, sizeof st);
217 }
218 (void) close(fd);
219 }
220 else
221 {
222 if (LogLevel > logl)
223 sm_syslog(LOG_WARNING, NOQID,
224 "STARTTLS: Warning: safeopen(%s) failed",
225 randfile);
226 }
227 }
228 else if (randdef == RF_OK)
229 {
230 if (LogLevel > logl)
231 sm_syslog(LOG_WARNING, NOQID,
232 "STARTTLS: Error: no proper random file definition %s",
233 randfile);
234 randdef = RF_UNKNOWN;
235 }
236 if (randdef == RF_MISS)
237 {
238 if (LogLevel > logl)
239 sm_syslog(LOG_WARNING, NOQID,
240 "STARTTLS: Error: missing random file definition");
241 }
242 if (!ok && bitnset(DBS_INSUFFICIENTENTROPY, DontBlameSendmail))
243 {
244 int i;
245 long r;
246 unsigned char buf[MIN_RAND_BYTES];
247
248 /* assert((MIN_RAND_BYTES % sizeof(long)) == 0); */
249 for (i = 0; i <= sizeof(buf) - sizeof(long); i += sizeof(long))
250 {
251 r = get_random();
252 (void) memcpy(buf + i, (void *) &r, sizeof(long));
253 }
254 RAND_seed(buf, sizeof buf);
255 if (LogLevel > logl)
256 sm_syslog(LOG_WARNING, NOQID,
257 "STARTTLS: Warning: random number generator not properly seeded");
258 ok = true;
259 }
260 done = ok ? RI_SUCCESS : RI_FAIL;
261 return ok;
262# else /* ! HASURANDOMDEV */
263 return true;
264# endif /* ! HASURANDOMDEV */
265}
266/*
267** INIT_TLS_LIBRARY -- Calls functions which setup TLS library for global use.
268**
269** Parameters:
270** none.
271**
272** Returns:
273** succeeded?
274*/
275
276bool
277init_tls_library()
278{
279 /* basic TLS initialization, ignore result for now */
280 SSL_library_init();
281 SSL_load_error_strings();
282# if 0
283 /* this is currently a macro for SSL_library_init */
284 SSLeay_add_ssl_algorithms();
285# endif /* 0 */
286
287 return tls_rand_init(RandFile, 7);
288}
289/*
290** TLS_SET_VERIFY -- request client certificate?
291**
292** Parameters:
293** ctx -- TLS context
294** ssl -- TLS structure
295** vrfy -- require certificate?
296**
297** Returns:
298** none.
299**
300** Side Effects:
301** Sets verification state for TLS
302**
303# if TLS_VRFY_PER_CTX
304** Notice:
305** This is per TLS context, not per TLS structure;
306** the former is global, the latter per connection.
307** It would be nice to do this per connection, but this
308** doesn't work in the current TLS libraries :-(
309# endif * TLS_VRFY_PER_CTX *
310*/
311
312void
313tls_set_verify(ctx, ssl, vrfy)
314 SSL_CTX *ctx;
315 SSL *ssl;
316 bool vrfy;
317{
318# if !TLS_VRFY_PER_CTX
319 SSL_set_verify(ssl, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, NULL);
320# else /* !TLS_VRFY_PER_CTX */
321 SSL_CTX_set_verify(ctx, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE,
322 NULL);
323# endif /* !TLS_VRFY_PER_CTX */
324}
325
326/*
327** status in initialization
328** these flags keep track of the status of the initialization
329** i.e., whether a file exists (_EX) and whether it can be used (_OK)
330** [due to permissions]
331*/
332
333# define TLS_S_NONE 0x00000000 /* none yet */
334# define TLS_S_CERT_EX 0x00000001 /* cert file exists */
335# define TLS_S_CERT_OK 0x00000002 /* cert file is ok */
336# define TLS_S_KEY_EX 0x00000004 /* key file exists */
337# define TLS_S_KEY_OK 0x00000008 /* key file is ok */
338# define TLS_S_CERTP_EX 0x00000010 /* CA cert path exists */
339# define TLS_S_CERTP_OK 0x00000020 /* CA cert path is ok */
340# define TLS_S_CERTF_EX 0x00000040 /* CA cert file exists */
341# define TLS_S_CERTF_OK 0x00000080 /* CA cert file is ok */
342# define TLS_S_CRLF_EX 0x00000100 /* CRL file exists */
343# define TLS_S_CRLF_OK 0x00000200 /* CRL file is ok */
344
345# if _FFR_TLS_1
346# define TLS_S_CERT2_EX 0x00001000 /* 2nd cert file exists */
347# define TLS_S_CERT2_OK 0x00002000 /* 2nd cert file is ok */
348# define TLS_S_KEY2_EX 0x00004000 /* 2nd key file exists */
349# define TLS_S_KEY2_OK 0x00008000 /* 2nd key file is ok */
350# endif /* _FFR_TLS_1 */
351
352# define TLS_S_DH_OK 0x00200000 /* DH cert is ok */
353# define TLS_S_DHPAR_EX 0x00400000 /* DH param file exists */
354# define TLS_S_DHPAR_OK 0x00800000 /* DH param file is ok to use */
355
356/* Type of variable */
357# define TLS_T_OTHER 0
358# define TLS_T_SRV 1
359# define TLS_T_CLT 2
360
361/*
362** TLS_OK_F -- can var be an absolute filename?
363**
364** Parameters:
365** var -- filename
366** fn -- what is the filename used for?
367** type -- type of variable
368**
369** Returns:
370** ok?
371*/
372
373static bool
374tls_ok_f(var, fn, type)
375 char *var;
376 char *fn;
377 int type;
378{
379 /* must be absolute pathname */
380 if (var != NULL && *var == '/')
381 return true;
382 if (LogLevel > 12)
383 sm_syslog(LOG_WARNING, NOQID, "STARTTLS: %s%s missing",
384 type == TLS_T_SRV ? "Server" :
385 (type == TLS_T_CLT ? "Client" : ""), fn);
386 return false;
387}
388/*
389** TLS_SAFE_F -- is a file safe to use?
390**
391** Parameters:
392** var -- filename
393** sff -- flags for safefile()
394** srv -- server side?
395**
396** Returns:
397** ok?
398*/
399
400static bool
401tls_safe_f(var, sff, srv)
402 char *var;
403 long sff;
404 bool srv;
405{
406 int ret;
407
408 if ((ret = safefile(var, RunAsUid, RunAsGid, RunAsUserName, sff,
409 S_IRUSR, NULL)) == 0)
410 return true;
411 if (LogLevel > 7)
412 sm_syslog(LOG_WARNING, NOQID, "STARTTLS=%s: file %s unsafe: %s",
413 srv ? "server" : "client", var, sm_errstring(ret));
414 return false;
415}
416
417/*
418** TLS_OK_F -- macro to simplify calls to tls_ok_f
419**
420** Parameters:
421** var -- filename
422** fn -- what is the filename used for?
423** req -- is the file required?
424** st -- status bit to set if ok
425** type -- type of variable
426**
427** Side Effects:
428** uses r, ok; may change ok and status.
429**
430*/
431
432# define TLS_OK_F(var, fn, req, st, type) if (ok) \
433 { \
434 r = tls_ok_f(var, fn, type); \
435 if (r) \
436 status |= st; \
437 else if (req) \
438 ok = false; \
439 }
440
441/*
442** TLS_UNR -- macro to return whether a file should be unreadable
443**
444** Parameters:
445** bit -- flag to test
446** req -- flags
447**
448** Returns:
449** 0/SFF_NORFILES
450*/
451# define TLS_UNR(bit, req) (bitset(bit, req) ? SFF_NORFILES : 0)
452# define TLS_OUNR(bit, req) (bitset(bit, req) ? SFF_NOWRFILES : 0)
453# define TLS_KEYSFF(req) \
454 (bitnset(DBS_GROUPREADABLEKEYFILE, DontBlameSendmail) ? \
455 TLS_OUNR(TLS_I_KEY_OUNR, req) : \
456 TLS_UNR(TLS_I_KEY_UNR, req))
457
458/*
459** TLS_SAFE_F -- macro to simplify calls to tls_safe_f
460**
461** Parameters:
462** var -- filename
463** sff -- flags for safefile()
464** req -- is the file required?
465** ex -- does the file exist?
466** st -- status bit to set if ok
467** srv -- server side?
468**
469** Side Effects:
470** uses r, ok, ex; may change ok and status.
471**
472*/
473
474# define TLS_SAFE_F(var, sff, req, ex, st, srv) if (ex && ok) \
475 { \
476 r = tls_safe_f(var, sff, srv); \
477 if (r) \
478 status |= st; \
479 else if (req) \
480 ok = false; \
481 }
482
483/*
484** INITTLS -- initialize TLS
485**
486** Parameters:
487** ctx -- pointer to context
488** req -- requirements for initialization (see sendmail.h)
489** srv -- server side?
490** certfile -- filename of certificate
491** keyfile -- filename of private key
492** cacertpath -- path to CAs
493** cacertfile -- file with CA(s)
494** dhparam -- parameters for DH
495**
496** Returns:
497** succeeded?
498*/
499
500bool
501inittls(ctx, req, srv, certfile, keyfile, cacertpath, cacertfile, dhparam)
502 SSL_CTX **ctx;
503 unsigned long req;
504 bool srv;
505 char *certfile, *keyfile, *cacertpath, *cacertfile, *dhparam;
506{
507# if !NO_DH
508 static DH *dh = NULL;
509# endif /* !NO_DH */
510 int r;
511 bool ok;
512 long sff, status;
513 char *who;
514# if _FFR_TLS_1
515 char *cf2, *kf2;
516# endif /* _FFR_TLS_1 */
517# if SM_CONF_SHM
518 extern int ShmId;
519# endif /* SM_CONF_SHM */
520# if OPENSSL_VERSION_NUMBER > 0x00907000L
521 BIO *crl_file;
522 X509_CRL *crl;
523 X509_STORE *store;
524# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */
525
526 status = TLS_S_NONE;
527 who = srv ? "server" : "client";
528 if (ctx == NULL)
529 syserr("STARTTLS=%s, inittls: ctx == NULL", who);
530
531 /* already initialized? (we could re-init...) */
532 if (*ctx != NULL)
533 return true;
534 ok = true;
535
536# if _FFR_TLS_1
537 /*
538 ** look for a second filename: it must be separated by a ','
539 ** no blanks allowed (they won't be skipped).
540 ** we change a global variable here! this change will be undone
541 ** before return from the function but only if it returns true.
542 ** this isn't a problem since in a failure case this function
543 ** won't be called again with the same (overwritten) values.
544 ** otherwise each return must be replaced with a goto endinittls.
545 */
546
547 cf2 = NULL;
548 kf2 = NULL;
549 if (certfile != NULL && (cf2 = strchr(certfile, ',')) != NULL)
550 {
551 *cf2++ = '\0';
552 if (keyfile != NULL && (kf2 = strchr(keyfile, ',')) != NULL)
553 *kf2++ = '\0';
554 }
555# endif /* _FFR_TLS_1 */
556
557 /*
558 ** Check whether files/paths are defined
559 */
560
561 TLS_OK_F(certfile, "CertFile", bitset(TLS_I_CERT_EX, req),
562 TLS_S_CERT_EX, srv ? TLS_T_SRV : TLS_T_CLT);
563 TLS_OK_F(keyfile, "KeyFile", bitset(TLS_I_KEY_EX, req),
564 TLS_S_KEY_EX, srv ? TLS_T_SRV : TLS_T_CLT);
565 TLS_OK_F(cacertpath, "CACertPath", bitset(TLS_I_CERTP_EX, req),
566 TLS_S_CERTP_EX, TLS_T_OTHER);
567 TLS_OK_F(cacertfile, "CACertFile", bitset(TLS_I_CERTF_EX, req),
568 TLS_S_CERTF_EX, TLS_T_OTHER);
569
570# if OPENSSL_VERSION_NUMBER > 0x00907000L
571 TLS_OK_F(CRLFile, "CRLFile", bitset(TLS_I_CRLF_EX, req),
572 TLS_S_CRLF_EX, TLS_T_OTHER);
573# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */
574
575# if _FFR_TLS_1
576 /*
577 ** if the second file is specified it must exist
578 ** XXX: it is possible here to define only one of those files
579 */
580
581 if (cf2 != NULL)
582 {
583 TLS_OK_F(cf2, "CertFile", bitset(TLS_I_CERT_EX, req),
584 TLS_S_CERT2_EX, srv ? TLS_T_SRV : TLS_T_CLT);
585 }
586 if (kf2 != NULL)
587 {
588 TLS_OK_F(kf2, "KeyFile", bitset(TLS_I_KEY_EX, req),
589 TLS_S_KEY2_EX, srv ? TLS_T_SRV : TLS_T_CLT);
590 }
591# endif /* _FFR_TLS_1 */
592
593 /*
594 ** valid values for dhparam are (only the first char is checked)
595 ** none no parameters: don't use DH
596 ** 512 generate 512 bit parameters (fixed)
597 ** 1024 generate 1024 bit parameters
598 ** /file/name read parameters from /file/name
599 ** default is: 1024 for server, 512 for client (OK? XXX)
600 */
601
602 if (bitset(TLS_I_TRY_DH, req))
603 {
604 if (dhparam != NULL)
605 {
606 char c = *dhparam;
607
608 if (c == '1')
609 req |= TLS_I_DH1024;
610 else if (c == '5')
611 req |= TLS_I_DH512;
612 else if (c != 'n' && c != 'N' && c != '/')
613 {
614 if (LogLevel > 12)
615 sm_syslog(LOG_WARNING, NOQID,
616 "STARTTLS=%s, error: illegal value '%s' for DHParam",
617 who, dhparam);
618 dhparam = NULL;
619 }
620 }
621 if (dhparam == NULL)
622 dhparam = srv ? "1" : "5";
623 else if (*dhparam == '/')
624 {
625 TLS_OK_F(dhparam, "DHParameters",
626 bitset(TLS_I_DHPAR_EX, req),
627 TLS_S_DHPAR_EX, TLS_T_OTHER);
628 }
629 }
630 if (!ok)
631 return ok;
632
633 /* certfile etc. must be "safe". */
634 sff = SFF_REGONLY | SFF_SAFEDIRPATH | SFF_NOWLINK
635 | SFF_NOGWFILES | SFF_NOWWFILES
636 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT;
637 if (DontLockReadFiles)
638 sff |= SFF_NOLOCK;
639
640 TLS_SAFE_F(certfile, sff | TLS_UNR(TLS_I_CERT_UNR, req),
641 bitset(TLS_I_CERT_EX, req),
642 bitset(TLS_S_CERT_EX, status), TLS_S_CERT_OK, srv);
643 TLS_SAFE_F(keyfile, sff | TLS_KEYSFF(req),
644 bitset(TLS_I_KEY_EX, req),
645 bitset(TLS_S_KEY_EX, status), TLS_S_KEY_OK, srv);
646 TLS_SAFE_F(cacertfile, sff | TLS_UNR(TLS_I_CERTF_UNR, req),
647 bitset(TLS_I_CERTF_EX, req),
648 bitset(TLS_S_CERTF_EX, status), TLS_S_CERTF_OK, srv);
649 TLS_SAFE_F(dhparam, sff | TLS_UNR(TLS_I_DHPAR_UNR, req),
650 bitset(TLS_I_DHPAR_EX, req),
651 bitset(TLS_S_DHPAR_EX, status), TLS_S_DHPAR_OK, srv);
652# if OPENSSL_VERSION_NUMBER > 0x00907000L
653 TLS_SAFE_F(CRLFile, sff | TLS_UNR(TLS_I_CRLF_UNR, req),
654 bitset(TLS_I_CRLF_EX, req),
655 bitset(TLS_S_CRLF_EX, status), TLS_S_CRLF_OK, srv);
656# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */
657 if (!ok)
658 return ok;
659# if _FFR_TLS_1
660 if (cf2 != NULL)
661 {
662 TLS_SAFE_F(cf2, sff | TLS_UNR(TLS_I_CERT_UNR, req),
663 bitset(TLS_I_CERT_EX, req),
664 bitset(TLS_S_CERT2_EX, status), TLS_S_CERT2_OK, srv);
665 }
666 if (kf2 != NULL)
667 {
668 TLS_SAFE_F(kf2, sff | TLS_KEYSFF(req),
669 bitset(TLS_I_KEY_EX, req),
670 bitset(TLS_S_KEY2_EX, status), TLS_S_KEY2_OK, srv);
671 }
672# endif /* _FFR_TLS_1 */
673
674 /* create a method and a new context */
675 if ((*ctx = SSL_CTX_new(srv ? SSLv23_server_method() :
676 SSLv23_client_method())) == NULL)
677 {
678 if (LogLevel > 7)
679 sm_syslog(LOG_WARNING, NOQID,
680 "STARTTLS=%s, error: SSL_CTX_new(SSLv23_%s_method()) failed",
681 who, who);
682 if (LogLevel > 9)
683 tlslogerr(who);
684 return false;
685 }
686
687# if OPENSSL_VERSION_NUMBER > 0x00907000L
688 if (CRLFile != NULL)
689 {
690 /* get a pointer to the current certificate validation store */
691 store = SSL_CTX_get_cert_store(*ctx); /* does not fail */
692 crl_file = BIO_new(BIO_s_file_internal());
693 if (crl_file != NULL)
694 {
695 if (BIO_read_filename(crl_file, CRLFile) >= 0)
696 {
697 crl = PEM_read_bio_X509_CRL(crl_file, NULL,
698 NULL, NULL);
699 BIO_free(crl_file);
700 X509_STORE_add_crl(store, crl);
701 X509_CRL_free(crl);
702 X509_STORE_set_flags(store,
703 X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL);
704 X509_STORE_set_verify_cb_func(store,
705 x509_verify_cb);
706 }
707 else
708 {
709 if (LogLevel > 9)
710 {
711 sm_syslog(LOG_WARNING, NOQID,
712 "STARTTLS=%s, error: PEM_read_bio_X509_CRL(%s)=failed",
713 who, CRLFile);
714 }
715
716 /* avoid memory leaks */
717 BIO_free(crl_file);
718 return false;
719 }
720
721 }
722 else if (LogLevel > 9)
723 sm_syslog(LOG_WARNING, NOQID,
724 "STARTTLS=%s, error: BIO_new=failed", who);
725 }
726# if _FFR_CRLPATH
727 if (CRLPath != NULL)
728 {
729 X509_LOOKUP *lookup;
730
731 lookup = X509_STORE_add_lookup(store, X509_LOOKUP_hash_dir());
732 if (lookup == NULL)
733 {
734 if (LogLevel > 9)
735 {
736 sm_syslog(LOG_WARNING, NOQID,
737 "STARTTLS=%s, error: X509_STORE_add_lookup(hash)=failed",
738 who, CRLFile);
739 }
740 return false;
741 }
742 X509_LOOKUP_add_dir(lookup, CRLPath, X509_FILETYPE_PEM);
743 X509_STORE_set_flags(store,
744 X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL);
745 }
746# endif /* _FFR_CRLPATH */
747# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */
748
749# if TLS_NO_RSA
750 /* turn off backward compatibility, required for no-rsa */
751 SSL_CTX_set_options(*ctx, SSL_OP_NO_SSLv2);
752# endif /* TLS_NO_RSA */
753
754
755# if !TLS_NO_RSA
756 /*
757 ** Create a temporary RSA key
758 ** XXX Maybe we shouldn't create this always (even though it
759 ** is only at startup).
760 ** It is a time-consuming operation and it is not always necessary.
761 ** maybe we should do it only on demand...
762 */
763
764 if (bitset(TLS_I_RSA_TMP, req)
765# if SM_CONF_SHM
766 && ShmId != SM_SHM_NO_ID &&
767 (rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL,
768 NULL)) == NULL
769# else /* SM_CONF_SHM */
770 && 0 /* no shared memory: no need to generate key now */
771# endif /* SM_CONF_SHM */
772 )
773 {
774 if (LogLevel > 7)
775 {
776 sm_syslog(LOG_WARNING, NOQID,
777 "STARTTLS=%s, error: RSA_generate_key failed",
778 who);
779 if (LogLevel > 9)
780 tlslogerr(who);
781 }
782 return false;
783 }
784# endif /* !TLS_NO_RSA */
785
786 /*
787 ** load private key
788 ** XXX change this for DSA-only version
789 */
790
791 if (bitset(TLS_S_KEY_OK, status) &&
792 SSL_CTX_use_PrivateKey_file(*ctx, keyfile,
793 SSL_FILETYPE_PEM) <= 0)
794 {
795 if (LogLevel > 7)
796 {
797 sm_syslog(LOG_WARNING, NOQID,
798 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed",
799 who, keyfile);
800 if (LogLevel > 9)
801 tlslogerr(who);
802 }
803 if (bitset(TLS_I_USE_KEY, req))
804 return false;
805 }
806
807 /* get the certificate file */
808 if (bitset(TLS_S_CERT_OK, status) &&
809 SSL_CTX_use_certificate_file(*ctx, certfile,
810 SSL_FILETYPE_PEM) <= 0)
811 {
812 if (LogLevel > 7)
813 {
814 sm_syslog(LOG_WARNING, NOQID,
815 "STARTTLS=%s, error: SSL_CTX_use_certificate_file(%s) failed",
816 who, certfile);
817 if (LogLevel > 9)
818 tlslogerr(who);
819 }
820 if (bitset(TLS_I_USE_CERT, req))
821 return false;
822 }
823
824 /* check the private key */
825 if (bitset(TLS_S_KEY_OK, status) &&
826 (r = SSL_CTX_check_private_key(*ctx)) <= 0)
827 {
828 /* Private key does not match the certificate public key */
829 if (LogLevel > 5)
830 {
831 sm_syslog(LOG_WARNING, NOQID,
832 "STARTTLS=%s, error: SSL_CTX_check_private_key failed(%s): %d",
833 who, keyfile, r);
834 if (LogLevel > 9)
835 tlslogerr(who);
836 }
837 if (bitset(TLS_I_USE_KEY, req))
838 return false;
839 }
840
841# if _FFR_TLS_1
842 /* XXX this code is pretty much duplicated from above! */
843
844 /* load private key */
845 if (bitset(TLS_S_KEY2_OK, status) &&
846 SSL_CTX_use_PrivateKey_file(*ctx, kf2, SSL_FILETYPE_PEM) <= 0)
847 {
848 if (LogLevel > 7)
849 {
850 sm_syslog(LOG_WARNING, NOQID,
851 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed",
852 who, kf2);
853 if (LogLevel > 9)
854 tlslogerr(who);
855 }
856 }
857
858 /* get the certificate file */
859 if (bitset(TLS_S_CERT2_OK, status) &&
860 SSL_CTX_use_certificate_file(*ctx, cf2, SSL_FILETYPE_PEM) <= 0)
861 {
862 if (LogLevel > 7)
863 {
864 sm_syslog(LOG_WARNING, NOQID,
865 "STARTTLS=%s, error: SSL_CTX_use_certificate_file(%s) failed",
866 who, cf2);
867 if (LogLevel > 9)
868 tlslogerr(who);
869 }
870 }
871
872 /* also check the private key */
873 if (bitset(TLS_S_KEY2_OK, status) &&
874 (r = SSL_CTX_check_private_key(*ctx)) <= 0)
875 {
876 /* Private key does not match the certificate public key */
877 if (LogLevel > 5)
878 {
879 sm_syslog(LOG_WARNING, NOQID,
880 "STARTTLS=%s, error: SSL_CTX_check_private_key 2 failed: %d",
881 who, r);
882 if (LogLevel > 9)
883 tlslogerr(who);
884 }
885 }
886# endif /* _FFR_TLS_1 */
887
888 /* SSL_CTX_set_quiet_shutdown(*ctx, 1); violation of standard? */
889 SSL_CTX_set_options(*ctx, SSL_OP_ALL); /* XXX bug compatibility? */
890
891# if !NO_DH
892 /* Diffie-Hellman initialization */
893 if (bitset(TLS_I_TRY_DH, req))
894 {
895 if (bitset(TLS_S_DHPAR_OK, status))
896 {
897 BIO *bio;
898
899 if ((bio = BIO_new_file(dhparam, "r")) != NULL)
900 {
901 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
902 BIO_free(bio);
903 if (dh == NULL && LogLevel > 7)
904 {
905 unsigned long err;
906
907 err = ERR_get_error();
908 sm_syslog(LOG_WARNING, NOQID,
909 "STARTTLS=%s, error: cannot read DH parameters(%s): %s",
910 who, dhparam,
911 ERR_error_string(err, NULL));
912 if (LogLevel > 9)
913 tlslogerr(who);
914 }
915 }
916 else
917 {
918 if (LogLevel > 5)
919 {
920 sm_syslog(LOG_WARNING, NOQID,
921 "STARTTLS=%s, error: BIO_new_file(%s) failed",
922 who, dhparam);
923 if (LogLevel > 9)
924 tlslogerr(who);
925 }
926 }
927 }
928 if (dh == NULL && bitset(TLS_I_DH1024, req))
929 {
930 DSA *dsa;
931
932 /* this takes a while! (7-130s on a 450MHz AMD K6-2) */
933 dsa = DSA_generate_parameters(1024, NULL, 0, NULL,
934 NULL, 0, NULL);
935 dh = DSA_dup_DH(dsa);
936 DSA_free(dsa);
937 }
938 else
939 if (dh == NULL && bitset(TLS_I_DH512, req))
940 dh = get_dh512();
941
942 if (dh == NULL)
943 {
944 if (LogLevel > 9)
945 {
946 unsigned long err;
947
948 err = ERR_get_error();
949 sm_syslog(LOG_WARNING, NOQID,
950 "STARTTLS=%s, error: cannot read or set DH parameters(%s): %s",
951 who, dhparam,
952 ERR_error_string(err, NULL));
953 }
954 if (bitset(TLS_I_REQ_DH, req))
955 return false;
956 }
957 else
958 {
959 SSL_CTX_set_tmp_dh(*ctx, dh);
960
961 /* important to avoid small subgroup attacks */
962 SSL_CTX_set_options(*ctx, SSL_OP_SINGLE_DH_USE);
963 if (LogLevel > 13)
964 sm_syslog(LOG_INFO, NOQID,
965 "STARTTLS=%s, Diffie-Hellman init, key=%d bit (%c)",
966 who, 8 * DH_size(dh), *dhparam);
967 DH_free(dh);
968 }
969 }
970# endif /* !NO_DH */
971
972
973 /* XXX do we need this cache here? */
974 if (bitset(TLS_I_CACHE, req))
975 SSL_CTX_sess_set_cache_size(*ctx, 128);
976 /* timeout? SSL_CTX_set_timeout(*ctx, TimeOut...); */
977
978 /* load certificate locations and default CA paths */
979 if (bitset(TLS_S_CERTP_EX, status) && bitset(TLS_S_CERTF_EX, status))
980 {
981 if ((r = SSL_CTX_load_verify_locations(*ctx, cacertfile,
982 cacertpath)) == 1)
983 {
984# if !TLS_NO_RSA
985 if (bitset(TLS_I_RSA_TMP, req))
986 SSL_CTX_set_tmp_rsa_callback(*ctx, tmp_rsa_key);
987# endif /* !TLS_NO_RSA */
988
989 /*
990 ** We have to install our own verify callback:
991 ** SSL_VERIFY_PEER requests a client cert but even
992 ** though *FAIL_IF* isn't set, the connection
993 ** will be aborted if the client presents a cert
994 ** that is not "liked" (can't be verified?) by
995 ** the TLS library :-(
996 */
997
998 /*
999 ** XXX currently we could call tls_set_verify()
1000 ** but we hope that that function will later on
1001 ** only set the mode per connection.
1002 */
1003 SSL_CTX_set_verify(*ctx,
1004 bitset(TLS_I_NO_VRFY, req) ? SSL_VERIFY_NONE
1005 : SSL_VERIFY_PEER,
1006 NULL);
1007
1008 /* install verify callback */
1009 SSL_CTX_set_cert_verify_callback(*ctx, tls_verify_cb,
1010 NULL);
1011 SSL_CTX_set_client_CA_list(*ctx,
1012 SSL_load_client_CA_file(cacertfile));
1013 }
1014 else
1015 {
1016 /*
1017 ** can't load CA data; do we care?
1018 ** the data is necessary to authenticate the client,
1019 ** which in turn would be necessary
1020 ** if we want to allow relaying based on it.
1021 */
1022 if (LogLevel > 5)
1023 {
1024 sm_syslog(LOG_WARNING, NOQID,
1025 "STARTTLS=%s, error: load verify locs %s, %s failed: %d",
1026 who, cacertpath, cacertfile, r);
1027 if (LogLevel > 9)
1028 tlslogerr(who);
1029 }
1030 if (bitset(TLS_I_VRFY_LOC, req))
1031 return false;
1032 }
1033 }
1034
1035 /* XXX: make this dependent on an option? */
1036 if (tTd(96, 9))
1037 SSL_CTX_set_info_callback(*ctx, apps_ssl_info_cb);
1038
1039# if _FFR_TLS_1
1040 /* install our own cipher list */
1041 if (CipherList != NULL && *CipherList != '\0')
1042 {
1043 if (SSL_CTX_set_cipher_list(*ctx, CipherList) <= 0)
1044 {
1045 if (LogLevel > 7)
1046 {
1047 sm_syslog(LOG_WARNING, NOQID,
1048 "STARTTLS=%s, error: SSL_CTX_set_cipher_list(%s) failed, list ignored",
1049 who, CipherList);
1050
1051 if (LogLevel > 9)
1052 tlslogerr(who);
1053 }
1054 /* failure if setting to this list is required? */
1055 }
1056 }
1057# endif /* _FFR_TLS_1 */
1058 if (LogLevel > 12)
1059 sm_syslog(LOG_INFO, NOQID, "STARTTLS=%s, init=%d", who, ok);
1060
1061# if _FFR_TLS_1
1062# if 0
1063 /*
1064 ** this label is required if we want to have a "clean" exit
1065 ** see the comments above at the initialization of cf2
1066 */
1067
1068 endinittls:
1069# endif /* 0 */
1070
1071 /* undo damage to global variables */
1072 if (cf2 != NULL)
1073 *--cf2 = ',';
1074 if (kf2 != NULL)
1075 *--kf2 = ',';
1076# endif /* _FFR_TLS_1 */
1077
1078 return ok;
1079}
1080/*
1081** TLS_GET_INFO -- get information about TLS connection
1082**
1083** Parameters:
1084** ssl -- TLS connection structure
1085** srv -- server or client
1086** host -- hostname of other side
1087** mac -- macro storage
1088** certreq -- did we ask for a cert?
1089**
1090** Returns:
1091** result of authentication.
1092**
1093** Side Effects:
1094** sets macros: {cipher}, {tls_version}, {verify},
1095** {cipher_bits}, {alg_bits}, {cert}, {cert_subject},
1096** {cert_issuer}, {cn_subject}, {cn_issuer}
1097*/
1098
1099int
1100tls_get_info(ssl, srv, host, mac, certreq)
1101 SSL *ssl;
1102 bool srv;
1103 char *host;
1104 MACROS_T *mac;
1105 bool certreq;
1106{
1107 SSL_CIPHER *c;
1108 int b, r;
1109 long verifyok;
1110 char *s, *who;
1111 char bitstr[16];
1112 X509 *cert;
1113
1114 c = SSL_get_current_cipher(ssl);
1115
1116 /* cast is just workaround for compiler warning */
1117 macdefine(mac, A_TEMP, macid("{cipher}"),
1118 (char *) SSL_CIPHER_get_name(c));
1119 b = SSL_CIPHER_get_bits(c, &r);
1120 (void) sm_snprintf(bitstr, sizeof bitstr, "%d", b);
1121 macdefine(mac, A_TEMP, macid("{cipher_bits}"), bitstr);
1122 (void) sm_snprintf(bitstr, sizeof bitstr, "%d", r);
1123 macdefine(mac, A_TEMP, macid("{alg_bits}"), bitstr);
1124 s = SSL_CIPHER_get_version(c);
1125 if (s == NULL)
1126 s = "UNKNOWN";
1127 macdefine(mac, A_TEMP, macid("{tls_version}"), s);
1128
1129 who = srv ? "server" : "client";
1130 cert = SSL_get_peer_certificate(ssl);
1131 verifyok = SSL_get_verify_result(ssl);
1132 if (LogLevel > 14)
1133 sm_syslog(LOG_INFO, NOQID,
1134 "STARTTLS=%s, get_verify: %ld get_peer: 0x%lx",
1135 who, verifyok, (unsigned long) cert);
1136 if (cert != NULL)
1137 {
1138 unsigned int n;
1139 unsigned char md[EVP_MAX_MD_SIZE];
1140 char buf[MAXNAME];
1141
1142 X509_NAME_oneline(X509_get_subject_name(cert),
1143 buf, sizeof buf);
1144 macdefine(mac, A_TEMP, macid("{cert_subject}"),
1145 xtextify(buf, "<>\")"));
1146 X509_NAME_oneline(X509_get_issuer_name(cert),
1147 buf, sizeof buf);
1148 macdefine(mac, A_TEMP, macid("{cert_issuer}"),
1149 xtextify(buf, "<>\")"));
1150 X509_NAME_get_text_by_NID(X509_get_subject_name(cert),
1151 NID_commonName, buf, sizeof buf);
1152 macdefine(mac, A_TEMP, macid("{cn_subject}"),
1153 xtextify(buf, "<>\")"));
1154 X509_NAME_get_text_by_NID(X509_get_issuer_name(cert),
1155 NID_commonName, buf, sizeof buf);
1156 macdefine(mac, A_TEMP, macid("{cn_issuer}"),
1157 xtextify(buf, "<>\")"));
|
1159 {
1160 char md5h[EVP_MAX_MD_SIZE * 3];
1161 static const char hexcodes[] = "0123456789ABCDEF";
1162
1163 SM_ASSERT((n * 3) + 2 < sizeof(md5h));
1164 for (r = 0; r < (int) n; r++)
1165 {
1166 md5h[r * 3] = hexcodes[(md[r] & 0xf0) >> 4];
1167 md5h[(r * 3) + 1] = hexcodes[(md[r] & 0x0f)];
1168 md5h[(r * 3) + 2] = ':';
1169 }
1170 md5h[(n * 3) - 1] = '\0';
1171 macdefine(mac, A_TEMP, macid("{cert_md5}"), md5h);
1172 }
1173 else
1174 macdefine(mac, A_TEMP, macid("{cert_md5}"), "");
1175 }
1176 else
1177 {
1178 macdefine(mac, A_PERM, macid("{cert_subject}"), "");
1179 macdefine(mac, A_PERM, macid("{cert_issuer}"), "");
1180 macdefine(mac, A_PERM, macid("{cn_subject}"), "");
1181 macdefine(mac, A_PERM, macid("{cn_issuer}"), "");
1182 macdefine(mac, A_TEMP, macid("{cert_md5}"), "");
1183 }
1184 switch (verifyok)
1185 {
1186 case X509_V_OK:
1187 if (cert != NULL)
1188 {
1189 s = "OK";
1190 r = TLS_AUTH_OK;
1191 }
1192 else
1193 {
1194 s = certreq ? "NO" : "NOT",
1195 r = TLS_AUTH_NO;
1196 }
1197 break;
1198 default:
1199 s = "FAIL";
1200 r = TLS_AUTH_FAIL;
1201 break;
1202 }
1203 macdefine(mac, A_PERM, macid("{verify}"), s);
1204 if (cert != NULL)
1205 X509_free(cert);
1206
1207 /* do some logging */
1208 if (LogLevel > 8)
1209 {
1210 char *vers, *s1, *s2, *cbits, *algbits;
1211
1212 vers = macget(mac, macid("{tls_version}"));
1213 cbits = macget(mac, macid("{cipher_bits}"));
1214 algbits = macget(mac, macid("{alg_bits}"));
1215 s1 = macget(mac, macid("{verify}"));
1216 s2 = macget(mac, macid("{cipher}"));
1217
1218 /* XXX: maybe cut off ident info? */
1219 sm_syslog(LOG_INFO, NOQID,
1220 "STARTTLS=%s, relay=%.100s, version=%.16s, verify=%.16s, cipher=%.64s, bits=%.6s/%.6s",
1221 who,
1222 host == NULL ? "local" : host,
1223 vers, s1, s2, /* sm_snprintf() can deal with NULL */
1224 algbits == NULL ? "0" : algbits,
1225 cbits == NULL ? "0" : cbits);
1226 if (LogLevel > 11)
1227 {
1228 /*
1229 ** Maybe run xuntextify on the strings?
1230 ** That is easier to read but makes it maybe a bit
1231 ** more complicated to figure out the right values
1232 ** for the access map...
1233 */
1234
1235 s1 = macget(mac, macid("{cert_subject}"));
1236 s2 = macget(mac, macid("{cert_issuer}"));
1237 sm_syslog(LOG_INFO, NOQID,
1238 "STARTTLS=%s, cert-subject=%.256s, cert-issuer=%.256s, verifymsg=%s",
1239 who, s1, s2,
1240 X509_verify_cert_error_string(verifyok));
1241 }
1242 }
1243 return r;
1244}
1245/*
1246** ENDTLS -- shutdown secure connection
1247**
1248** Parameters:
1249** ssl -- SSL connection information.
1250** side -- server/client (for logging).
1251**
1252** Returns:
1253** success? (EX_* code)
1254*/
1255
1256int
1257endtls(ssl, side)
1258 SSL *ssl;
1259 char *side;
1260{
1261 int ret = EX_OK;
1262
1263 if (ssl != NULL)
1264 {
1265 int r;
1266
1267 if ((r = SSL_shutdown(ssl)) < 0)
1268 {
1269 if (LogLevel > 11)
1270 {
1271 sm_syslog(LOG_WARNING, NOQID,
1272 "STARTTLS=%s, SSL_shutdown failed: %d",
1273 side, r);
1274 tlslogerr(side);
1275 }
1276 ret = EX_SOFTWARE;
1277 }
1278# if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL
1279
1280 /*
1281 ** Bug in OpenSSL (at least up to 0.9.6b):
1282 ** From: Lutz.Jaenicke@aet.TU-Cottbus.DE
1283 ** Message-ID: <20010723152244.A13122@serv01.aet.tu-cottbus.de>
1284 ** To: openssl-users@openssl.org
1285 ** Subject: Re: SSL_shutdown() woes (fwd)
1286 **
1287 ** The side sending the shutdown alert first will
1288 ** not care about the answer of the peer but will
1289 ** immediately return with a return value of "0"
1290 ** (ssl/s3_lib.c:ssl3_shutdown()). SSL_get_error will evaluate
1291 ** the value of "0" and as the shutdown alert of the peer was
1292 ** not received (actually, the program did not even wait for
1293 ** the answer), an SSL_ERROR_SYSCALL is flagged, because this
1294 ** is the default rule in case everything else does not apply.
1295 **
1296 ** For your server the problem is different, because it
1297 ** receives the shutdown first (setting SSL_RECEIVED_SHUTDOWN),
1298 ** then sends its response (SSL_SENT_SHUTDOWN), so for the
1299 ** server the shutdown was successfull.
1300 **
1301 ** As is by know, you would have to call SSL_shutdown() once
1302 ** and ignore an SSL_ERROR_SYSCALL returned. Then call
1303 ** SSL_shutdown() again to actually get the server's response.
1304 **
1305 ** In the last discussion, Bodo Moeller concluded that a
1306 ** rewrite of the shutdown code would be necessary, but
1307 ** probably with another API, as the change would not be
1308 ** compatible to the way it is now. Things do not become
1309 ** easier as other programs do not follow the shutdown
1310 ** guidelines anyway, so that a lot error conditions and
1311 ** compitibility issues would have to be caught.
1312 **
1313 ** For now the recommondation is to ignore the error message.
1314 */
1315
1316 else if (r == 0)
1317 {
1318 if (LogLevel > 15)
1319 {
1320 sm_syslog(LOG_WARNING, NOQID,
1321 "STARTTLS=%s, SSL_shutdown not done",
1322 side);
1323 tlslogerr(side);
1324 }
1325 ret = EX_SOFTWARE;
1326 }
1327# endif /* !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL */
1328 SSL_free(ssl);
1329 ssl = NULL;
1330 }
1331 return ret;
1332}
1333
1334# if !TLS_NO_RSA
1335/*
1336** TMP_RSA_KEY -- return temporary RSA key
1337**
1338** Parameters:
1339** s -- TLS connection structure
1340** export --
1341** keylength --
1342**
1343** Returns:
1344** temporary RSA key.
1345*/
1346
1347# ifndef MAX_RSA_TMP_CNT
1348# define MAX_RSA_TMP_CNT 1000 /* XXX better value? */
1349# endif /* ! MAX_RSA_TMP_CNT */
1350
1351/* ARGUSED0 */
1352static RSA *
1353tmp_rsa_key(s, export, keylength)
1354 SSL *s;
1355 int export;
1356 int keylength;
1357{
1358# if SM_CONF_SHM
1359 extern int ShmId;
1360 extern int *PRSATmpCnt;
1361
1362 if (ShmId != SM_SHM_NO_ID && rsa_tmp != NULL &&
1363 ++(*PRSATmpCnt) < MAX_RSA_TMP_CNT)
1364 return rsa_tmp;
1365# endif /* SM_CONF_SHM */
1366
1367 if (rsa_tmp != NULL)
1368 RSA_free(rsa_tmp);
1369 rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, NULL);
1370 if (rsa_tmp == NULL)
1371 {
1372 if (LogLevel > 0)
1373 sm_syslog(LOG_ERR, NOQID,
1374 "STARTTLS=server, tmp_rsa_key: RSA_generate_key failed!");
1375 }
1376 else
1377 {
1378# if SM_CONF_SHM
1379# if 0
1380 /*
1381 ** XXX we can't (yet) share the new key...
1382 ** The RSA structure contains pointers hence it can't be
1383 ** easily kept in shared memory. It must be transformed
1384 ** into a continous memory region first, then stored,
1385 ** and later read out again (each time re-transformed).
1386 */
1387
1388 if (ShmId != SM_SHM_NO_ID)
1389 *PRSATmpCnt = 0;
1390# endif /* 0 */
1391# endif /* SM_CONF_SHM */
1392 if (LogLevel > 9)
1393 sm_syslog(LOG_ERR, NOQID,
1394 "STARTTLS=server, tmp_rsa_key: new temp RSA key");
1395 }
1396 return rsa_tmp;
1397}
1398# endif /* !TLS_NO_RSA */
1399/*
1400** APPS_SSL_INFO_CB -- info callback for TLS connections
1401**
1402** Parameters:
1403** s -- TLS connection structure
1404** where -- state in handshake
1405** ret -- return code of last operation
1406**
1407** Returns:
1408** none.
1409*/
1410
1411static void
1412apps_ssl_info_cb(s, where, ret)
1413 CONST097 SSL *s;
1414 int where;
1415 int ret;
1416{
1417 int w;
1418 char *str;
1419 BIO *bio_err = NULL;
1420
1421 if (LogLevel > 14)
1422 sm_syslog(LOG_INFO, NOQID,
1423 "STARTTLS: info_callback where=0x%x, ret=%d",
1424 where, ret);
1425
1426 w = where & ~SSL_ST_MASK;
1427 if (bio_err == NULL)
1428 bio_err = BIO_new_fp(stderr, BIO_NOCLOSE);
1429
1430 if (bitset(SSL_ST_CONNECT, w))
1431 str = "SSL_connect";
1432 else if (bitset(SSL_ST_ACCEPT, w))
1433 str = "SSL_accept";
1434 else
1435 str = "undefined";
1436
1437 if (bitset(SSL_CB_LOOP, where))
1438 {
1439 if (LogLevel > 12)
1440 sm_syslog(LOG_NOTICE, NOQID,
1441 "STARTTLS: %s:%s",
1442 str, SSL_state_string_long(s));
1443 }
1444 else if (bitset(SSL_CB_ALERT, where))
1445 {
1446 str = bitset(SSL_CB_READ, where) ? "read" : "write";
1447 if (LogLevel > 12)
1448 sm_syslog(LOG_NOTICE, NOQID,
1449 "STARTTLS: SSL3 alert %s:%s:%s",
1450 str, SSL_alert_type_string_long(ret),
1451 SSL_alert_desc_string_long(ret));
1452 }
1453 else if (bitset(SSL_CB_EXIT, where))
1454 {
1455 if (ret == 0)
1456 {
1457 if (LogLevel > 7)
1458 sm_syslog(LOG_WARNING, NOQID,
1459 "STARTTLS: %s:failed in %s",
1460 str, SSL_state_string_long(s));
1461 }
1462 else if (ret < 0)
1463 {
1464 if (LogLevel > 7)
1465 sm_syslog(LOG_WARNING, NOQID,
1466 "STARTTLS: %s:error in %s",
1467 str, SSL_state_string_long(s));
1468 }
1469 }
1470}
1471/*
1472** TLS_VERIFY_LOG -- log verify error for TLS certificates
1473**
1474** Parameters:
1475** ok -- verify ok?
1476** ctx -- x509 context
1477**
1478** Returns:
1479** 0 -- fatal error
1480** 1 -- ok
1481*/
1482
1483static int
1484tls_verify_log(ok, ctx, name)
1485 int ok;
1486 X509_STORE_CTX *ctx;
1487 char *name;
1488{
1489 SSL *ssl;
1490 X509 *cert;
1491 int reason, depth;
1492 char buf[512];
1493
1494 cert = X509_STORE_CTX_get_current_cert(ctx);
1495 reason = X509_STORE_CTX_get_error(ctx);
1496 depth = X509_STORE_CTX_get_error_depth(ctx);
1497 ssl = (SSL *) X509_STORE_CTX_get_ex_data(ctx,
1498 SSL_get_ex_data_X509_STORE_CTX_idx());
1499
1500 if (ssl == NULL)
1501 {
1502 /* internal error */
1503 sm_syslog(LOG_ERR, NOQID,
1504 "STARTTLS: internal error: tls_verify_cb: ssl == NULL");
1505 return 0;
1506 }
1507
1508 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof buf);
1509 sm_syslog(LOG_INFO, NOQID,
1510 "STARTTLS: %s cert verify: depth=%d %s, state=%d, reason=%s",
1511 name, depth, buf, ok, X509_verify_cert_error_string(reason));
1512 return 1;
1513}
1514
1515/*
1516** TLS_VERIFY_CB -- verify callback for TLS certificates
1517**
1518** Parameters:
1519** ctx -- x509 context
1520**
1521** Returns:
1522** accept connection?
1523** currently: always yes.
1524*/
1525
1526static int
1527# if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L
1528tls_verify_cb(ctx)
1529 X509_STORE_CTX *ctx;
1530# else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */
1531tls_verify_cb(ctx, unused)
1532 X509_STORE_CTX *ctx;
1533 void *unused;
1534# endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */
1535{
1536 int ok;
1537
1538 ok = X509_verify_cert(ctx);
1539 if (ok == 0)
1540 {
1541 if (LogLevel > 13)
1542 return tls_verify_log(ok, ctx, "TLS");
1543 return 1; /* override it */
1544 }
1545 return ok;
1546}
1547/*
1548** TLSLOGERR -- log the errors from the TLS error stack
1549**
1550** Parameters:
1551** who -- server/client (for logging).
1552**
1553** Returns:
1554** none.
1555*/
1556
1557void
1558tlslogerr(who)
1559 char *who;
1560{
1561 unsigned long l;
1562 int line, flags;
1563 unsigned long es;
1564 char *file, *data;
1565 char buf[256];
1566# define CP (const char **)
1567
1568 es = CRYPTO_thread_id();
1569 while ((l = ERR_get_error_line_data(CP &file, &line, CP &data, &flags))
1570 != 0)
1571 {
1572 sm_syslog(LOG_WARNING, NOQID,
1573 "STARTTLS=%s: %lu:%s:%s:%d:%s", who, es,
1574 ERR_error_string(l, buf),
1575 file, line,
1576 bitset(ERR_TXT_STRING, flags) ? data : "");
1577 }
1578}
1579
1580# if OPENSSL_VERSION_NUMBER > 0x00907000L
1581/*
1582** X509_VERIFY_CB -- verify callback
1583**
1584** Parameters:
1585** ctx -- x509 context
1586**
1587** Returns:
1588** accept connection?
1589** currently: always yes.
1590*/
1591
1592static int
1593x509_verify_cb(ok, ctx)
1594 int ok;
1595 X509_STORE_CTX *ctx;
1596{
1597 if (ok == 0)
1598 {
1599 if (LogLevel > 13)
1600 tls_verify_log(ok, ctx, "x509");
1601 if (ctx->error == X509_V_ERR_UNABLE_TO_GET_CRL)
1602 {
1603 ctx->error = 0;
1604 return 1; /* override it */
1605 }
1606 }
1607 return ok;
1608}
1609# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */
1610#endif /* STARTTLS */
| 1160 {
1161 char md5h[EVP_MAX_MD_SIZE * 3];
1162 static const char hexcodes[] = "0123456789ABCDEF";
1163
1164 SM_ASSERT((n * 3) + 2 < sizeof(md5h));
1165 for (r = 0; r < (int) n; r++)
1166 {
1167 md5h[r * 3] = hexcodes[(md[r] & 0xf0) >> 4];
1168 md5h[(r * 3) + 1] = hexcodes[(md[r] & 0x0f)];
1169 md5h[(r * 3) + 2] = ':';
1170 }
1171 md5h[(n * 3) - 1] = '\0';
1172 macdefine(mac, A_TEMP, macid("{cert_md5}"), md5h);
1173 }
1174 else
1175 macdefine(mac, A_TEMP, macid("{cert_md5}"), "");
1176 }
1177 else
1178 {
1179 macdefine(mac, A_PERM, macid("{cert_subject}"), "");
1180 macdefine(mac, A_PERM, macid("{cert_issuer}"), "");
1181 macdefine(mac, A_PERM, macid("{cn_subject}"), "");
1182 macdefine(mac, A_PERM, macid("{cn_issuer}"), "");
1183 macdefine(mac, A_TEMP, macid("{cert_md5}"), "");
1184 }
1185 switch (verifyok)
1186 {
1187 case X509_V_OK:
1188 if (cert != NULL)
1189 {
1190 s = "OK";
1191 r = TLS_AUTH_OK;
1192 }
1193 else
1194 {
1195 s = certreq ? "NO" : "NOT",
1196 r = TLS_AUTH_NO;
1197 }
1198 break;
1199 default:
1200 s = "FAIL";
1201 r = TLS_AUTH_FAIL;
1202 break;
1203 }
1204 macdefine(mac, A_PERM, macid("{verify}"), s);
1205 if (cert != NULL)
1206 X509_free(cert);
1207
1208 /* do some logging */
1209 if (LogLevel > 8)
1210 {
1211 char *vers, *s1, *s2, *cbits, *algbits;
1212
1213 vers = macget(mac, macid("{tls_version}"));
1214 cbits = macget(mac, macid("{cipher_bits}"));
1215 algbits = macget(mac, macid("{alg_bits}"));
1216 s1 = macget(mac, macid("{verify}"));
1217 s2 = macget(mac, macid("{cipher}"));
1218
1219 /* XXX: maybe cut off ident info? */
1220 sm_syslog(LOG_INFO, NOQID,
1221 "STARTTLS=%s, relay=%.100s, version=%.16s, verify=%.16s, cipher=%.64s, bits=%.6s/%.6s",
1222 who,
1223 host == NULL ? "local" : host,
1224 vers, s1, s2, /* sm_snprintf() can deal with NULL */
1225 algbits == NULL ? "0" : algbits,
1226 cbits == NULL ? "0" : cbits);
1227 if (LogLevel > 11)
1228 {
1229 /*
1230 ** Maybe run xuntextify on the strings?
1231 ** That is easier to read but makes it maybe a bit
1232 ** more complicated to figure out the right values
1233 ** for the access map...
1234 */
1235
1236 s1 = macget(mac, macid("{cert_subject}"));
1237 s2 = macget(mac, macid("{cert_issuer}"));
1238 sm_syslog(LOG_INFO, NOQID,
1239 "STARTTLS=%s, cert-subject=%.256s, cert-issuer=%.256s, verifymsg=%s",
1240 who, s1, s2,
1241 X509_verify_cert_error_string(verifyok));
1242 }
1243 }
1244 return r;
1245}
1246/*
1247** ENDTLS -- shutdown secure connection
1248**
1249** Parameters:
1250** ssl -- SSL connection information.
1251** side -- server/client (for logging).
1252**
1253** Returns:
1254** success? (EX_* code)
1255*/
1256
1257int
1258endtls(ssl, side)
1259 SSL *ssl;
1260 char *side;
1261{
1262 int ret = EX_OK;
1263
1264 if (ssl != NULL)
1265 {
1266 int r;
1267
1268 if ((r = SSL_shutdown(ssl)) < 0)
1269 {
1270 if (LogLevel > 11)
1271 {
1272 sm_syslog(LOG_WARNING, NOQID,
1273 "STARTTLS=%s, SSL_shutdown failed: %d",
1274 side, r);
1275 tlslogerr(side);
1276 }
1277 ret = EX_SOFTWARE;
1278 }
1279# if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL
1280
1281 /*
1282 ** Bug in OpenSSL (at least up to 0.9.6b):
1283 ** From: Lutz.Jaenicke@aet.TU-Cottbus.DE
1284 ** Message-ID: <20010723152244.A13122@serv01.aet.tu-cottbus.de>
1285 ** To: openssl-users@openssl.org
1286 ** Subject: Re: SSL_shutdown() woes (fwd)
1287 **
1288 ** The side sending the shutdown alert first will
1289 ** not care about the answer of the peer but will
1290 ** immediately return with a return value of "0"
1291 ** (ssl/s3_lib.c:ssl3_shutdown()). SSL_get_error will evaluate
1292 ** the value of "0" and as the shutdown alert of the peer was
1293 ** not received (actually, the program did not even wait for
1294 ** the answer), an SSL_ERROR_SYSCALL is flagged, because this
1295 ** is the default rule in case everything else does not apply.
1296 **
1297 ** For your server the problem is different, because it
1298 ** receives the shutdown first (setting SSL_RECEIVED_SHUTDOWN),
1299 ** then sends its response (SSL_SENT_SHUTDOWN), so for the
1300 ** server the shutdown was successfull.
1301 **
1302 ** As is by know, you would have to call SSL_shutdown() once
1303 ** and ignore an SSL_ERROR_SYSCALL returned. Then call
1304 ** SSL_shutdown() again to actually get the server's response.
1305 **
1306 ** In the last discussion, Bodo Moeller concluded that a
1307 ** rewrite of the shutdown code would be necessary, but
1308 ** probably with another API, as the change would not be
1309 ** compatible to the way it is now. Things do not become
1310 ** easier as other programs do not follow the shutdown
1311 ** guidelines anyway, so that a lot error conditions and
1312 ** compitibility issues would have to be caught.
1313 **
1314 ** For now the recommondation is to ignore the error message.
1315 */
1316
1317 else if (r == 0)
1318 {
1319 if (LogLevel > 15)
1320 {
1321 sm_syslog(LOG_WARNING, NOQID,
1322 "STARTTLS=%s, SSL_shutdown not done",
1323 side);
1324 tlslogerr(side);
1325 }
1326 ret = EX_SOFTWARE;
1327 }
1328# endif /* !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL */
1329 SSL_free(ssl);
1330 ssl = NULL;
1331 }
1332 return ret;
1333}
1334
1335# if !TLS_NO_RSA
1336/*
1337** TMP_RSA_KEY -- return temporary RSA key
1338**
1339** Parameters:
1340** s -- TLS connection structure
1341** export --
1342** keylength --
1343**
1344** Returns:
1345** temporary RSA key.
1346*/
1347
1348# ifndef MAX_RSA_TMP_CNT
1349# define MAX_RSA_TMP_CNT 1000 /* XXX better value? */
1350# endif /* ! MAX_RSA_TMP_CNT */
1351
1352/* ARGUSED0 */
1353static RSA *
1354tmp_rsa_key(s, export, keylength)
1355 SSL *s;
1356 int export;
1357 int keylength;
1358{
1359# if SM_CONF_SHM
1360 extern int ShmId;
1361 extern int *PRSATmpCnt;
1362
1363 if (ShmId != SM_SHM_NO_ID && rsa_tmp != NULL &&
1364 ++(*PRSATmpCnt) < MAX_RSA_TMP_CNT)
1365 return rsa_tmp;
1366# endif /* SM_CONF_SHM */
1367
1368 if (rsa_tmp != NULL)
1369 RSA_free(rsa_tmp);
1370 rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, NULL);
1371 if (rsa_tmp == NULL)
1372 {
1373 if (LogLevel > 0)
1374 sm_syslog(LOG_ERR, NOQID,
1375 "STARTTLS=server, tmp_rsa_key: RSA_generate_key failed!");
1376 }
1377 else
1378 {
1379# if SM_CONF_SHM
1380# if 0
1381 /*
1382 ** XXX we can't (yet) share the new key...
1383 ** The RSA structure contains pointers hence it can't be
1384 ** easily kept in shared memory. It must be transformed
1385 ** into a continous memory region first, then stored,
1386 ** and later read out again (each time re-transformed).
1387 */
1388
1389 if (ShmId != SM_SHM_NO_ID)
1390 *PRSATmpCnt = 0;
1391# endif /* 0 */
1392# endif /* SM_CONF_SHM */
1393 if (LogLevel > 9)
1394 sm_syslog(LOG_ERR, NOQID,
1395 "STARTTLS=server, tmp_rsa_key: new temp RSA key");
1396 }
1397 return rsa_tmp;
1398}
1399# endif /* !TLS_NO_RSA */
1400/*
1401** APPS_SSL_INFO_CB -- info callback for TLS connections
1402**
1403** Parameters:
1404** s -- TLS connection structure
1405** where -- state in handshake
1406** ret -- return code of last operation
1407**
1408** Returns:
1409** none.
1410*/
1411
1412static void
1413apps_ssl_info_cb(s, where, ret)
1414 CONST097 SSL *s;
1415 int where;
1416 int ret;
1417{
1418 int w;
1419 char *str;
1420 BIO *bio_err = NULL;
1421
1422 if (LogLevel > 14)
1423 sm_syslog(LOG_INFO, NOQID,
1424 "STARTTLS: info_callback where=0x%x, ret=%d",
1425 where, ret);
1426
1427 w = where & ~SSL_ST_MASK;
1428 if (bio_err == NULL)
1429 bio_err = BIO_new_fp(stderr, BIO_NOCLOSE);
1430
1431 if (bitset(SSL_ST_CONNECT, w))
1432 str = "SSL_connect";
1433 else if (bitset(SSL_ST_ACCEPT, w))
1434 str = "SSL_accept";
1435 else
1436 str = "undefined";
1437
1438 if (bitset(SSL_CB_LOOP, where))
1439 {
1440 if (LogLevel > 12)
1441 sm_syslog(LOG_NOTICE, NOQID,
1442 "STARTTLS: %s:%s",
1443 str, SSL_state_string_long(s));
1444 }
1445 else if (bitset(SSL_CB_ALERT, where))
1446 {
1447 str = bitset(SSL_CB_READ, where) ? "read" : "write";
1448 if (LogLevel > 12)
1449 sm_syslog(LOG_NOTICE, NOQID,
1450 "STARTTLS: SSL3 alert %s:%s:%s",
1451 str, SSL_alert_type_string_long(ret),
1452 SSL_alert_desc_string_long(ret));
1453 }
1454 else if (bitset(SSL_CB_EXIT, where))
1455 {
1456 if (ret == 0)
1457 {
1458 if (LogLevel > 7)
1459 sm_syslog(LOG_WARNING, NOQID,
1460 "STARTTLS: %s:failed in %s",
1461 str, SSL_state_string_long(s));
1462 }
1463 else if (ret < 0)
1464 {
1465 if (LogLevel > 7)
1466 sm_syslog(LOG_WARNING, NOQID,
1467 "STARTTLS: %s:error in %s",
1468 str, SSL_state_string_long(s));
1469 }
1470 }
1471}
1472/*
1473** TLS_VERIFY_LOG -- log verify error for TLS certificates
1474**
1475** Parameters:
1476** ok -- verify ok?
1477** ctx -- x509 context
1478**
1479** Returns:
1480** 0 -- fatal error
1481** 1 -- ok
1482*/
1483
1484static int
1485tls_verify_log(ok, ctx, name)
1486 int ok;
1487 X509_STORE_CTX *ctx;
1488 char *name;
1489{
1490 SSL *ssl;
1491 X509 *cert;
1492 int reason, depth;
1493 char buf[512];
1494
1495 cert = X509_STORE_CTX_get_current_cert(ctx);
1496 reason = X509_STORE_CTX_get_error(ctx);
1497 depth = X509_STORE_CTX_get_error_depth(ctx);
1498 ssl = (SSL *) X509_STORE_CTX_get_ex_data(ctx,
1499 SSL_get_ex_data_X509_STORE_CTX_idx());
1500
1501 if (ssl == NULL)
1502 {
1503 /* internal error */
1504 sm_syslog(LOG_ERR, NOQID,
1505 "STARTTLS: internal error: tls_verify_cb: ssl == NULL");
1506 return 0;
1507 }
1508
1509 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof buf);
1510 sm_syslog(LOG_INFO, NOQID,
1511 "STARTTLS: %s cert verify: depth=%d %s, state=%d, reason=%s",
1512 name, depth, buf, ok, X509_verify_cert_error_string(reason));
1513 return 1;
1514}
1515
1516/*
1517** TLS_VERIFY_CB -- verify callback for TLS certificates
1518**
1519** Parameters:
1520** ctx -- x509 context
1521**
1522** Returns:
1523** accept connection?
1524** currently: always yes.
1525*/
1526
1527static int
1528# if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L
1529tls_verify_cb(ctx)
1530 X509_STORE_CTX *ctx;
1531# else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */
1532tls_verify_cb(ctx, unused)
1533 X509_STORE_CTX *ctx;
1534 void *unused;
1535# endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */
1536{
1537 int ok;
1538
1539 ok = X509_verify_cert(ctx);
1540 if (ok == 0)
1541 {
1542 if (LogLevel > 13)
1543 return tls_verify_log(ok, ctx, "TLS");
1544 return 1; /* override it */
1545 }
1546 return ok;
1547}
1548/*
1549** TLSLOGERR -- log the errors from the TLS error stack
1550**
1551** Parameters:
1552** who -- server/client (for logging).
1553**
1554** Returns:
1555** none.
1556*/
1557
1558void
1559tlslogerr(who)
1560 char *who;
1561{
1562 unsigned long l;
1563 int line, flags;
1564 unsigned long es;
1565 char *file, *data;
1566 char buf[256];
1567# define CP (const char **)
1568
1569 es = CRYPTO_thread_id();
1570 while ((l = ERR_get_error_line_data(CP &file, &line, CP &data, &flags))
1571 != 0)
1572 {
1573 sm_syslog(LOG_WARNING, NOQID,
1574 "STARTTLS=%s: %lu:%s:%s:%d:%s", who, es,
1575 ERR_error_string(l, buf),
1576 file, line,
1577 bitset(ERR_TXT_STRING, flags) ? data : "");
1578 }
1579}
1580
1581# if OPENSSL_VERSION_NUMBER > 0x00907000L
1582/*
1583** X509_VERIFY_CB -- verify callback
1584**
1585** Parameters:
1586** ctx -- x509 context
1587**
1588** Returns:
1589** accept connection?
1590** currently: always yes.
1591*/
1592
1593static int
1594x509_verify_cb(ok, ctx)
1595 int ok;
1596 X509_STORE_CTX *ctx;
1597{
1598 if (ok == 0)
1599 {
1600 if (LogLevel > 13)
1601 tls_verify_log(ok, ctx, "x509");
1602 if (ctx->error == X509_V_ERR_UNABLE_TO_GET_CRL)
1603 {
1604 ctx->error = 0;
1605 return 1; /* override it */
1606 }
1607 }
1608 return ok;
1609}
1610# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */
1611#endif /* STARTTLS */
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