v3_utl.c revision 296465 
1/* v3_utl.c */
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4 * project.
5 */
6/* ====================================================================
7 * Copyright (c) 1999-2003 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com).  This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59/* X509 v3 extension utilities */
60
61#include <stdio.h>
62#include <ctype.h>
63#include "cryptlib.h"
64#include <openssl/conf.h>
65#include <openssl/x509v3.h>
66#include <openssl/bn.h>
67
68static char *strip_spaces(char *name);
69static int sk_strcmp(const char *const *a, const char *const *b);
70static STACK *get_email(X509_NAME *name, GENERAL_NAMES *gens);
71static void str_free(void *str);
72static int append_ia5(STACK ** sk, ASN1_IA5STRING *email);
73
74static int ipv4_from_asc(unsigned char *v4, const char *in);
75static int ipv6_from_asc(unsigned char *v6, const char *in);
76static int ipv6_cb(const char *elem, int len, void *usr);
77static int ipv6_hex(unsigned char *out, const char *in, int inlen);
78
79/* Add a CONF_VALUE name value pair to stack */
80
81int X509V3_add_value(const char *name, const char *value,
82                     STACK_OF(CONF_VALUE) **extlist)
83{
84    CONF_VALUE *vtmp = NULL;
85    char *tname = NULL, *tvalue = NULL;
86    if (name && !(tname = BUF_strdup(name)))
87        goto err;
88    if (value && !(tvalue = BUF_strdup(value)))
89        goto err;
90    if (!(vtmp = (CONF_VALUE *)OPENSSL_malloc(sizeof(CONF_VALUE))))
91        goto err;
92    if (!*extlist && !(*extlist = sk_CONF_VALUE_new_null()))
93        goto err;
94    vtmp->section = NULL;
95    vtmp->name = tname;
96    vtmp->value = tvalue;
97    if (!sk_CONF_VALUE_push(*extlist, vtmp))
98        goto err;
99    return 1;
100 err:
101    X509V3err(X509V3_F_X509V3_ADD_VALUE, ERR_R_MALLOC_FAILURE);
102    if (vtmp)
103        OPENSSL_free(vtmp);
104    if (tname)
105        OPENSSL_free(tname);
106    if (tvalue)
107        OPENSSL_free(tvalue);
108    return 0;
109}
110
111int X509V3_add_value_uchar(const char *name, const unsigned char *value,
112                           STACK_OF(CONF_VALUE) **extlist)
113{
114    return X509V3_add_value(name, (const char *)value, extlist);
115}
116
117/* Free function for STACK_OF(CONF_VALUE) */
118
119void X509V3_conf_free(CONF_VALUE *conf)
120{
121    if (!conf)
122        return;
123    if (conf->name)
124        OPENSSL_free(conf->name);
125    if (conf->value)
126        OPENSSL_free(conf->value);
127    if (conf->section)
128        OPENSSL_free(conf->section);
129    OPENSSL_free(conf);
130}
131
132int X509V3_add_value_bool(const char *name, int asn1_bool,
133                          STACK_OF(CONF_VALUE) **extlist)
134{
135    if (asn1_bool)
136        return X509V3_add_value(name, "TRUE", extlist);
137    return X509V3_add_value(name, "FALSE", extlist);
138}
139
140int X509V3_add_value_bool_nf(char *name, int asn1_bool,
141                             STACK_OF(CONF_VALUE) **extlist)
142{
143    if (asn1_bool)
144        return X509V3_add_value(name, "TRUE", extlist);
145    return 1;
146}
147
148char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, ASN1_ENUMERATED *a)
149{
150    BIGNUM *bntmp = NULL;
151    char *strtmp = NULL;
152    if (!a)
153        return NULL;
154    if (!(bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) ||
155        !(strtmp = BN_bn2dec(bntmp)))
156        X509V3err(X509V3_F_I2S_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
157    BN_free(bntmp);
158    return strtmp;
159}
160
161char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, ASN1_INTEGER *a)
162{
163    BIGNUM *bntmp = NULL;
164    char *strtmp = NULL;
165    if (!a)
166        return NULL;
167    if (!(bntmp = ASN1_INTEGER_to_BN(a, NULL)) ||
168        !(strtmp = BN_bn2dec(bntmp)))
169        X509V3err(X509V3_F_I2S_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
170    BN_free(bntmp);
171    return strtmp;
172}
173
174ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, char *value)
175{
176    BIGNUM *bn = NULL;
177    ASN1_INTEGER *aint;
178    int isneg, ishex;
179    int ret;
180    if (!value) {
181        X509V3err(X509V3_F_S2I_ASN1_INTEGER, X509V3_R_INVALID_NULL_VALUE);
182        return 0;
183    }
184    bn = BN_new();
185    if (value[0] == '-') {
186        value++;
187        isneg = 1;
188    } else
189        isneg = 0;
190
191    if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
192        value += 2;
193        ishex = 1;
194    } else
195        ishex = 0;
196
197    if (ishex)
198        ret = BN_hex2bn(&bn, value);
199    else
200        ret = BN_dec2bn(&bn, value);
201
202    if (!ret || value[ret]) {
203        BN_free(bn);
204        X509V3err(X509V3_F_S2I_ASN1_INTEGER, X509V3_R_BN_DEC2BN_ERROR);
205        return 0;
206    }
207
208    if (isneg && BN_is_zero(bn))
209        isneg = 0;
210
211    aint = BN_to_ASN1_INTEGER(bn, NULL);
212    BN_free(bn);
213    if (!aint) {
214        X509V3err(X509V3_F_S2I_ASN1_INTEGER,
215                  X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
216        return 0;
217    }
218    if (isneg)
219        aint->type |= V_ASN1_NEG;
220    return aint;
221}
222
223int X509V3_add_value_int(const char *name, ASN1_INTEGER *aint,
224                         STACK_OF(CONF_VALUE) **extlist)
225{
226    char *strtmp;
227    int ret;
228    if (!aint)
229        return 1;
230    if (!(strtmp = i2s_ASN1_INTEGER(NULL, aint)))
231        return 0;
232    ret = X509V3_add_value(name, strtmp, extlist);
233    OPENSSL_free(strtmp);
234    return ret;
235}
236
237int X509V3_get_value_bool(CONF_VALUE *value, int *asn1_bool)
238{
239    char *btmp;
240    if (!(btmp = value->value))
241        goto err;
242    if (!strcmp(btmp, "TRUE") || !strcmp(btmp, "true")
243        || !strcmp(btmp, "Y") || !strcmp(btmp, "y")
244        || !strcmp(btmp, "YES") || !strcmp(btmp, "yes")) {
245        *asn1_bool = 0xff;
246        return 1;
247    } else if (!strcmp(btmp, "FALSE") || !strcmp(btmp, "false")
248               || !strcmp(btmp, "N") || !strcmp(btmp, "n")
249               || !strcmp(btmp, "NO") || !strcmp(btmp, "no")) {
250        *asn1_bool = 0;
251        return 1;
252    }
253 err:
254    X509V3err(X509V3_F_X509V3_GET_VALUE_BOOL,
255              X509V3_R_INVALID_BOOLEAN_STRING);
256    X509V3_conf_err(value);
257    return 0;
258}
259
260int X509V3_get_value_int(CONF_VALUE *value, ASN1_INTEGER **aint)
261{
262    ASN1_INTEGER *itmp;
263    if (!(itmp = s2i_ASN1_INTEGER(NULL, value->value))) {
264        X509V3_conf_err(value);
265        return 0;
266    }
267    *aint = itmp;
268    return 1;
269}
270
271#define HDR_NAME        1
272#define HDR_VALUE       2
273
274/*
275 * #define DEBUG
276 */
277
278STACK_OF(CONF_VALUE) *X509V3_parse_list(const char *line)
279{
280    char *p, *q, c;
281    char *ntmp, *vtmp;
282    STACK_OF(CONF_VALUE) *values = NULL;
283    char *linebuf;
284    int state;
285    /* We are going to modify the line so copy it first */
286    linebuf = BUF_strdup(line);
287    state = HDR_NAME;
288    ntmp = NULL;
289    /* Go through all characters */
290    for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
291         p++) {
292
293        switch (state) {
294        case HDR_NAME:
295            if (c == ':') {
296                state = HDR_VALUE;
297                *p = 0;
298                ntmp = strip_spaces(q);
299                if (!ntmp) {
300                    X509V3err(X509V3_F_X509V3_PARSE_LIST,
301                              X509V3_R_INVALID_NULL_NAME);
302                    goto err;
303                }
304                q = p + 1;
305            } else if (c == ',') {
306                *p = 0;
307                ntmp = strip_spaces(q);
308                q = p + 1;
309#if 0
310                printf("%s\n", ntmp);
311#endif
312                if (!ntmp) {
313                    X509V3err(X509V3_F_X509V3_PARSE_LIST,
314                              X509V3_R_INVALID_NULL_NAME);
315                    goto err;
316                }
317                X509V3_add_value(ntmp, NULL, &values);
318            }
319            break;
320
321        case HDR_VALUE:
322            if (c == ',') {
323                state = HDR_NAME;
324                *p = 0;
325                vtmp = strip_spaces(q);
326#if 0
327                printf("%s\n", ntmp);
328#endif
329                if (!vtmp) {
330                    X509V3err(X509V3_F_X509V3_PARSE_LIST,
331                              X509V3_R_INVALID_NULL_VALUE);
332                    goto err;
333                }
334                X509V3_add_value(ntmp, vtmp, &values);
335                ntmp = NULL;
336                q = p + 1;
337            }
338
339        }
340    }
341
342    if (state == HDR_VALUE) {
343        vtmp = strip_spaces(q);
344#if 0
345        printf("%s=%s\n", ntmp, vtmp);
346#endif
347        if (!vtmp) {
348            X509V3err(X509V3_F_X509V3_PARSE_LIST,
349                      X509V3_R_INVALID_NULL_VALUE);
350            goto err;
351        }
352        X509V3_add_value(ntmp, vtmp, &values);
353    } else {
354        ntmp = strip_spaces(q);
355#if 0
356        printf("%s\n", ntmp);
357#endif
358        if (!ntmp) {
359            X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
360            goto err;
361        }
362        X509V3_add_value(ntmp, NULL, &values);
363    }
364    OPENSSL_free(linebuf);
365    return values;
366
367 err:
368    OPENSSL_free(linebuf);
369    sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
370    return NULL;
371
372}
373
374/* Delete leading and trailing spaces from a string */
375static char *strip_spaces(char *name)
376{
377    char *p, *q;
378    /* Skip over leading spaces */
379    p = name;
380    while (*p && isspace((unsigned char)*p))
381        p++;
382    if (!*p)
383        return NULL;
384    q = p + strlen(p) - 1;
385    while ((q != p) && isspace((unsigned char)*q))
386        q--;
387    if (p != q)
388        q[1] = 0;
389    if (!*p)
390        return NULL;
391    return p;
392}
393
394/* hex string utilities */
395
396/*
397 * Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its
398 * hex representation @@@ (Contents of buffer are always kept in ASCII, also
399 * on EBCDIC machines)
400 */
401
402char *hex_to_string(unsigned char *buffer, long len)
403{
404    char *tmp, *q;
405    unsigned char *p;
406    int i;
407    const static char hexdig[] = "0123456789ABCDEF";
408    if (!buffer || !len)
409        return NULL;
410    if (!(tmp = OPENSSL_malloc(len * 3 + 1))) {
411        X509V3err(X509V3_F_HEX_TO_STRING, ERR_R_MALLOC_FAILURE);
412        return NULL;
413    }
414    q = tmp;
415    for (i = 0, p = buffer; i < len; i++, p++) {
416        *q++ = hexdig[(*p >> 4) & 0xf];
417        *q++ = hexdig[*p & 0xf];
418        *q++ = ':';
419    }
420    q[-1] = 0;
421#ifdef CHARSET_EBCDIC
422    ebcdic2ascii(tmp, tmp, q - tmp - 1);
423#endif
424
425    return tmp;
426}
427
428/*
429 * Give a string of hex digits convert to a buffer
430 */
431
432unsigned char *string_to_hex(char *str, long *len)
433{
434    unsigned char *hexbuf, *q;
435    unsigned char ch, cl, *p;
436    if (!str) {
437        X509V3err(X509V3_F_STRING_TO_HEX, X509V3_R_INVALID_NULL_ARGUMENT);
438        return NULL;
439    }
440    if (!(hexbuf = OPENSSL_malloc(strlen(str) >> 1)))
441        goto err;
442    for (p = (unsigned char *)str, q = hexbuf; *p;) {
443        ch = *p++;
444#ifdef CHARSET_EBCDIC
445        ch = os_toebcdic[ch];
446#endif
447        if (ch == ':')
448            continue;
449        cl = *p++;
450#ifdef CHARSET_EBCDIC
451        cl = os_toebcdic[cl];
452#endif
453        if (!cl) {
454            X509V3err(X509V3_F_STRING_TO_HEX, X509V3_R_ODD_NUMBER_OF_DIGITS);
455            OPENSSL_free(hexbuf);
456            return NULL;
457        }
458        if (isupper(ch))
459            ch = tolower(ch);
460        if (isupper(cl))
461            cl = tolower(cl);
462
463        if ((ch >= '0') && (ch <= '9'))
464            ch -= '0';
465        else if ((ch >= 'a') && (ch <= 'f'))
466            ch -= 'a' - 10;
467        else
468            goto badhex;
469
470        if ((cl >= '0') && (cl <= '9'))
471            cl -= '0';
472        else if ((cl >= 'a') && (cl <= 'f'))
473            cl -= 'a' - 10;
474        else
475            goto badhex;
476
477        *q++ = (ch << 4) | cl;
478    }
479
480    if (len)
481        *len = q - hexbuf;
482
483    return hexbuf;
484
485 err:
486    if (hexbuf)
487        OPENSSL_free(hexbuf);
488    X509V3err(X509V3_F_STRING_TO_HEX, ERR_R_MALLOC_FAILURE);
489    return NULL;
490
491 badhex:
492    OPENSSL_free(hexbuf);
493    X509V3err(X509V3_F_STRING_TO_HEX, X509V3_R_ILLEGAL_HEX_DIGIT);
494    return NULL;
495
496}
497
498/*
499 * V2I name comparison function: returns zero if 'name' matches cmp or cmp.*
500 */
501
502int name_cmp(const char *name, const char *cmp)
503{
504    int len, ret;
505    char c;
506    len = strlen(cmp);
507    if ((ret = strncmp(name, cmp, len)))
508        return ret;
509    c = name[len];
510    if (!c || (c == '.'))
511        return 0;
512    return 1;
513}
514
515static int sk_strcmp(const char *const *a, const char *const *b)
516{
517    return strcmp(*a, *b);
518}
519
520STACK *X509_get1_email(X509 *x)
521{
522    GENERAL_NAMES *gens;
523    STACK *ret;
524    gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
525    ret = get_email(X509_get_subject_name(x), gens);
526    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
527    return ret;
528}
529
530STACK *X509_get1_ocsp(X509 *x)
531{
532    AUTHORITY_INFO_ACCESS *info;
533    STACK *ret = NULL;
534    int i;
535    info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL);
536    if (!info)
537        return NULL;
538    for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++) {
539        ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i);
540        if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
541            if (ad->location->type == GEN_URI) {
542                if (!append_ia5
543                    (&ret, ad->location->d.uniformResourceIdentifier))
544                    break;
545            }
546        }
547    }
548    AUTHORITY_INFO_ACCESS_free(info);
549    return ret;
550}
551
552STACK *X509_REQ_get1_email(X509_REQ *x)
553{
554    GENERAL_NAMES *gens;
555    STACK_OF(X509_EXTENSION) *exts;
556    STACK *ret;
557    exts = X509_REQ_get_extensions(x);
558    gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
559    ret = get_email(X509_REQ_get_subject_name(x), gens);
560    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
561    sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
562    return ret;
563}
564
565static STACK *get_email(X509_NAME *name, GENERAL_NAMES *gens)
566{
567    STACK *ret = NULL;
568    X509_NAME_ENTRY *ne;
569    ASN1_IA5STRING *email;
570    GENERAL_NAME *gen;
571    int i;
572    /* Now add any email address(es) to STACK */
573    i = -1;
574    /* First supplied X509_NAME */
575    while ((i = X509_NAME_get_index_by_NID(name,
576                                           NID_pkcs9_emailAddress, i)) >= 0) {
577        ne = X509_NAME_get_entry(name, i);
578        email = X509_NAME_ENTRY_get_data(ne);
579        if (!append_ia5(&ret, email))
580            return NULL;
581    }
582    for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
583        gen = sk_GENERAL_NAME_value(gens, i);
584        if (gen->type != GEN_EMAIL)
585            continue;
586        if (!append_ia5(&ret, gen->d.ia5))
587            return NULL;
588    }
589    return ret;
590}
591
592static void str_free(void *str)
593{
594    OPENSSL_free(str);
595}
596
597static int append_ia5(STACK ** sk, ASN1_IA5STRING *email)
598{
599    char *emtmp;
600    /* First some sanity checks */
601    if (email->type != V_ASN1_IA5STRING)
602        return 1;
603    if (!email->data || !email->length)
604        return 1;
605    if (!*sk)
606        *sk = sk_new(sk_strcmp);
607    if (!*sk)
608        return 0;
609    /* Don't add duplicates */
610    if (sk_find(*sk, (char *)email->data) != -1)
611        return 1;
612    emtmp = BUF_strdup((char *)email->data);
613    if (!emtmp || !sk_push(*sk, emtmp)) {
614        X509_email_free(*sk);
615        *sk = NULL;
616        return 0;
617    }
618    return 1;
619}
620
621void X509_email_free(STACK * sk)
622{
623    sk_pop_free(sk, str_free);
624}
625
626/*
627 * Convert IP addresses both IPv4 and IPv6 into an OCTET STRING compatible
628 * with RFC3280.
629 */
630
631ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
632{
633    unsigned char ipout[16];
634    ASN1_OCTET_STRING *ret;
635    int iplen;
636
637    /* If string contains a ':' assume IPv6 */
638
639    iplen = a2i_ipadd(ipout, ipasc);
640
641    if (!iplen)
642        return NULL;
643
644    ret = ASN1_OCTET_STRING_new();
645    if (!ret)
646        return NULL;
647    if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) {
648        ASN1_OCTET_STRING_free(ret);
649        return NULL;
650    }
651    return ret;
652}
653
654ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)
655{
656    ASN1_OCTET_STRING *ret = NULL;
657    unsigned char ipout[32];
658    char *iptmp = NULL, *p;
659    int iplen1, iplen2;
660    p = strchr(ipasc, '/');
661    if (!p)
662        return NULL;
663    iptmp = BUF_strdup(ipasc);
664    if (!iptmp)
665        return NULL;
666    p = iptmp + (p - ipasc);
667    *p++ = 0;
668
669    iplen1 = a2i_ipadd(ipout, iptmp);
670
671    if (!iplen1)
672        goto err;
673
674    iplen2 = a2i_ipadd(ipout + iplen1, p);
675
676    OPENSSL_free(iptmp);
677    iptmp = NULL;
678
679    if (!iplen2 || (iplen1 != iplen2))
680        goto err;
681
682    ret = ASN1_OCTET_STRING_new();
683    if (!ret)
684        goto err;
685    if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
686        goto err;
687
688    return ret;
689
690 err:
691    if (iptmp)
692        OPENSSL_free(iptmp);
693    if (ret)
694        ASN1_OCTET_STRING_free(ret);
695    return NULL;
696}
697
698int a2i_ipadd(unsigned char *ipout, const char *ipasc)
699{
700    /* If string contains a ':' assume IPv6 */
701
702    if (strchr(ipasc, ':')) {
703        if (!ipv6_from_asc(ipout, ipasc))
704            return 0;
705        return 16;
706    } else {
707        if (!ipv4_from_asc(ipout, ipasc))
708            return 0;
709        return 4;
710    }
711}
712
713static int ipv4_from_asc(unsigned char *v4, const char *in)
714{
715    int a0, a1, a2, a3;
716    if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
717        return 0;
718    if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
719        || (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
720        return 0;
721    v4[0] = a0;
722    v4[1] = a1;
723    v4[2] = a2;
724    v4[3] = a3;
725    return 1;
726}
727
728typedef struct {
729    /* Temporary store for IPV6 output */
730    unsigned char tmp[16];
731    /* Total number of bytes in tmp */
732    int total;
733    /* The position of a zero (corresponding to '::') */
734    int zero_pos;
735    /* Number of zeroes */
736    int zero_cnt;
737} IPV6_STAT;
738
739static int ipv6_from_asc(unsigned char *v6, const char *in)
740{
741    IPV6_STAT v6stat;
742    v6stat.total = 0;
743    v6stat.zero_pos = -1;
744    v6stat.zero_cnt = 0;
745    /*
746     * Treat the IPv6 representation as a list of values separated by ':'.
747     * The presence of a '::' will parse as one, two or three zero length
748     * elements.
749     */
750    if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
751        return 0;
752
753    /* Now for some sanity checks */
754
755    if (v6stat.zero_pos == -1) {
756        /* If no '::' must have exactly 16 bytes */
757        if (v6stat.total != 16)
758            return 0;
759    } else {
760        /* If '::' must have less than 16 bytes */
761        if (v6stat.total == 16)
762            return 0;
763        /* More than three zeroes is an error */
764        if (v6stat.zero_cnt > 3)
765            return 0;
766        /* Can only have three zeroes if nothing else present */
767        else if (v6stat.zero_cnt == 3) {
768            if (v6stat.total > 0)
769                return 0;
770        }
771        /* Can only have two zeroes if at start or end */
772        else if (v6stat.zero_cnt == 2) {
773            if ((v6stat.zero_pos != 0)
774                && (v6stat.zero_pos != v6stat.total))
775                return 0;
776        } else
777            /* Can only have one zero if *not* start or end */
778        {
779            if ((v6stat.zero_pos == 0)
780                || (v6stat.zero_pos == v6stat.total))
781                return 0;
782        }
783    }
784
785    /* Format result */
786
787    if (v6stat.zero_pos >= 0) {
788        /* Copy initial part */
789        memcpy(v6, v6stat.tmp, v6stat.zero_pos);
790        /* Zero middle */
791        memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
792        /* Copy final part */
793        if (v6stat.total != v6stat.zero_pos)
794            memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
795                   v6stat.tmp + v6stat.zero_pos,
796                   v6stat.total - v6stat.zero_pos);
797    } else
798        memcpy(v6, v6stat.tmp, 16);
799
800    return 1;
801}
802
803static int ipv6_cb(const char *elem, int len, void *usr)
804{
805    IPV6_STAT *s = usr;
806    /* Error if 16 bytes written */
807    if (s->total == 16)
808        return 0;
809    if (len == 0) {
810        /* Zero length element, corresponds to '::' */
811        if (s->zero_pos == -1)
812            s->zero_pos = s->total;
813        /* If we've already got a :: its an error */
814        else if (s->zero_pos != s->total)
815            return 0;
816        s->zero_cnt++;
817    } else {
818        /* If more than 4 characters could be final a.b.c.d form */
819        if (len > 4) {
820            /* Need at least 4 bytes left */
821            if (s->total > 12)
822                return 0;
823            /* Must be end of string */
824            if (elem[len])
825                return 0;
826            if (!ipv4_from_asc(s->tmp + s->total, elem))
827                return 0;
828            s->total += 4;
829        } else {
830            if (!ipv6_hex(s->tmp + s->total, elem, len))
831                return 0;
832            s->total += 2;
833        }
834    }
835    return 1;
836}
837
838/*
839 * Convert a string of up to 4 hex digits into the corresponding IPv6 form.
840 */
841
842static int ipv6_hex(unsigned char *out, const char *in, int inlen)
843{
844    unsigned char c;
845    unsigned int num = 0;
846    if (inlen > 4)
847        return 0;
848    while (inlen--) {
849        c = *in++;
850        num <<= 4;
851        if ((c >= '0') && (c <= '9'))
852            num |= c - '0';
853        else if ((c >= 'A') && (c <= 'F'))
854            num |= c - 'A' + 10;
855        else if ((c >= 'a') && (c <= 'f'))
856            num |= c - 'a' + 10;
857        else
858            return 0;
859    }
860    out[0] = num >> 8;
861    out[1] = num & 0xff;
862    return 1;
863}
864
865int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE) *dn_sk,
866                             unsigned long chtype)
867{
868    CONF_VALUE *v;
869    int i, mval;
870    char *p, *type;
871    if (!nm)
872        return 0;
873
874    for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) {
875        v = sk_CONF_VALUE_value(dn_sk, i);
876        type = v->name;
877        /*
878         * Skip past any leading X. X: X, etc to allow for multiple instances
879         */
880        for (p = type; *p; p++)
881#ifndef CHARSET_EBCDIC
882            if ((*p == ':') || (*p == ',') || (*p == '.'))
883#else
884            if ((*p == os_toascii[':']) || (*p == os_toascii[','])
885                || (*p == os_toascii['.']))
886#endif
887            {
888                p++;
889                if (*p)
890                    type = p;
891                break;
892            }
893#ifndef CHARSET_EBCDIC
894        if (*type == '+')
895#else
896        if (*type == os_toascii['+'])
897#endif
898        {
899            mval = -1;
900            type++;
901        } else
902            mval = 0;
903        if (!X509_NAME_add_entry_by_txt(nm, type, chtype,
904                                        (unsigned char *)v->value, -1, -1,
905                                        mval))
906            return 0;
907
908    }
909    return 1;
910}
911