v3_utl.c revision 296341 
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_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
71                                           GENERAL_NAMES *gens);
72static void str_free(OPENSSL_STRING str);
73static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email);
74
75static int ipv4_from_asc(unsigned char *v4, const char *in);
76static int ipv6_from_asc(unsigned char *v6, const char *in);
77static int ipv6_cb(const char *elem, int len, void *usr);
78static int ipv6_hex(unsigned char *out, const char *in, int inlen);
79
80/* Add a CONF_VALUE name value pair to stack */
81
82int X509V3_add_value(const char *name, const char *value,
83                     STACK_OF(CONF_VALUE) **extlist)
84{
85    CONF_VALUE *vtmp = NULL;
86    char *tname = NULL, *tvalue = NULL;
87    if (name && !(tname = BUF_strdup(name)))
88        goto err;
89    if (value && !(tvalue = BUF_strdup(value)))
90        goto err;
91    if (!(vtmp = (CONF_VALUE *)OPENSSL_malloc(sizeof(CONF_VALUE))))
92        goto err;
93    if (!*extlist && !(*extlist = sk_CONF_VALUE_new_null()))
94        goto err;
95    vtmp->section = NULL;
96    vtmp->name = tname;
97    vtmp->value = tvalue;
98    if (!sk_CONF_VALUE_push(*extlist, vtmp))
99        goto err;
100    return 1;
101 err:
102    X509V3err(X509V3_F_X509V3_ADD_VALUE, ERR_R_MALLOC_FAILURE);
103    if (vtmp)
104        OPENSSL_free(vtmp);
105    if (tname)
106        OPENSSL_free(tname);
107    if (tvalue)
108        OPENSSL_free(tvalue);
109    return 0;
110}
111
112int X509V3_add_value_uchar(const char *name, const unsigned char *value,
113                           STACK_OF(CONF_VALUE) **extlist)
114{
115    return X509V3_add_value(name, (const char *)value, extlist);
116}
117
118/* Free function for STACK_OF(CONF_VALUE) */
119
120void X509V3_conf_free(CONF_VALUE *conf)
121{
122    if (!conf)
123        return;
124    if (conf->name)
125        OPENSSL_free(conf->name);
126    if (conf->value)
127        OPENSSL_free(conf->value);
128    if (conf->section)
129        OPENSSL_free(conf->section);
130    OPENSSL_free(conf);
131}
132
133int X509V3_add_value_bool(const char *name, int asn1_bool,
134                          STACK_OF(CONF_VALUE) **extlist)
135{
136    if (asn1_bool)
137        return X509V3_add_value(name, "TRUE", extlist);
138    return X509V3_add_value(name, "FALSE", extlist);
139}
140
141int X509V3_add_value_bool_nf(char *name, int asn1_bool,
142                             STACK_OF(CONF_VALUE) **extlist)
143{
144    if (asn1_bool)
145        return X509V3_add_value(name, "TRUE", extlist);
146    return 1;
147}
148
149char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, ASN1_ENUMERATED *a)
150{
151    BIGNUM *bntmp = NULL;
152    char *strtmp = NULL;
153    if (!a)
154        return NULL;
155    if (!(bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) ||
156        !(strtmp = BN_bn2dec(bntmp)))
157        X509V3err(X509V3_F_I2S_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
158    BN_free(bntmp);
159    return strtmp;
160}
161
162char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, ASN1_INTEGER *a)
163{
164    BIGNUM *bntmp = NULL;
165    char *strtmp = NULL;
166    if (!a)
167        return NULL;
168    if (!(bntmp = ASN1_INTEGER_to_BN(a, NULL)) ||
169        !(strtmp = BN_bn2dec(bntmp)))
170        X509V3err(X509V3_F_I2S_ASN1_INTEGER, ERR_R_MALLOC_FAILURE);
171    BN_free(bntmp);
172    return strtmp;
173}
174
175ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, char *value)
176{
177    BIGNUM *bn = NULL;
178    ASN1_INTEGER *aint;
179    int isneg, ishex;
180    int ret;
181    if (!value) {
182        X509V3err(X509V3_F_S2I_ASN1_INTEGER, X509V3_R_INVALID_NULL_VALUE);
183        return 0;
184    }
185    bn = BN_new();
186    if (value[0] == '-') {
187        value++;
188        isneg = 1;
189    } else
190        isneg = 0;
191
192    if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) {
193        value += 2;
194        ishex = 1;
195    } else
196        ishex = 0;
197
198    if (ishex)
199        ret = BN_hex2bn(&bn, value);
200    else
201        ret = BN_dec2bn(&bn, value);
202
203    if (!ret || value[ret]) {
204        BN_free(bn);
205        X509V3err(X509V3_F_S2I_ASN1_INTEGER, X509V3_R_BN_DEC2BN_ERROR);
206        return 0;
207    }
208
209    if (isneg && BN_is_zero(bn))
210        isneg = 0;
211
212    aint = BN_to_ASN1_INTEGER(bn, NULL);
213    BN_free(bn);
214    if (!aint) {
215        X509V3err(X509V3_F_S2I_ASN1_INTEGER,
216                  X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
217        return 0;
218    }
219    if (isneg)
220        aint->type |= V_ASN1_NEG;
221    return aint;
222}
223
224int X509V3_add_value_int(const char *name, ASN1_INTEGER *aint,
225                         STACK_OF(CONF_VALUE) **extlist)
226{
227    char *strtmp;
228    int ret;
229    if (!aint)
230        return 1;
231    if (!(strtmp = i2s_ASN1_INTEGER(NULL, aint)))
232        return 0;
233    ret = X509V3_add_value(name, strtmp, extlist);
234    OPENSSL_free(strtmp);
235    return ret;
236}
237
238int X509V3_get_value_bool(CONF_VALUE *value, int *asn1_bool)
239{
240    char *btmp;
241    if (!(btmp = value->value))
242        goto err;
243    if (!strcmp(btmp, "TRUE") || !strcmp(btmp, "true")
244        || !strcmp(btmp, "Y") || !strcmp(btmp, "y")
245        || !strcmp(btmp, "YES") || !strcmp(btmp, "yes")) {
246        *asn1_bool = 0xff;
247        return 1;
248    } else if (!strcmp(btmp, "FALSE") || !strcmp(btmp, "false")
249               || !strcmp(btmp, "N") || !strcmp(btmp, "n")
250               || !strcmp(btmp, "NO") || !strcmp(btmp, "no")) {
251        *asn1_bool = 0;
252        return 1;
253    }
254 err:
255    X509V3err(X509V3_F_X509V3_GET_VALUE_BOOL,
256              X509V3_R_INVALID_BOOLEAN_STRING);
257    X509V3_conf_err(value);
258    return 0;
259}
260
261int X509V3_get_value_int(CONF_VALUE *value, ASN1_INTEGER **aint)
262{
263    ASN1_INTEGER *itmp;
264    if (!(itmp = s2i_ASN1_INTEGER(NULL, value->value))) {
265        X509V3_conf_err(value);
266        return 0;
267    }
268    *aint = itmp;
269    return 1;
270}
271
272#define HDR_NAME        1
273#define HDR_VALUE       2
274
275/*
276 * #define DEBUG
277 */
278
279STACK_OF(CONF_VALUE) *X509V3_parse_list(const char *line)
280{
281    char *p, *q, c;
282    char *ntmp, *vtmp;
283    STACK_OF(CONF_VALUE) *values = NULL;
284    char *linebuf;
285    int state;
286    /* We are going to modify the line so copy it first */
287    linebuf = BUF_strdup(line);
288    if (linebuf == NULL) {
289        X509V3err(X509V3_F_X509V3_PARSE_LIST, ERR_R_MALLOC_FAILURE);
290        goto err;
291    }
292    state = HDR_NAME;
293    ntmp = NULL;
294    /* Go through all characters */
295    for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
296         p++) {
297
298        switch (state) {
299        case HDR_NAME:
300            if (c == ':') {
301                state = HDR_VALUE;
302                *p = 0;
303                ntmp = strip_spaces(q);
304                if (!ntmp) {
305                    X509V3err(X509V3_F_X509V3_PARSE_LIST,
306                              X509V3_R_INVALID_NULL_NAME);
307                    goto err;
308                }
309                q = p + 1;
310            } else if (c == ',') {
311                *p = 0;
312                ntmp = strip_spaces(q);
313                q = p + 1;
314#if 0
315                printf("%s\n", ntmp);
316#endif
317                if (!ntmp) {
318                    X509V3err(X509V3_F_X509V3_PARSE_LIST,
319                              X509V3_R_INVALID_NULL_NAME);
320                    goto err;
321                }
322                X509V3_add_value(ntmp, NULL, &values);
323            }
324            break;
325
326        case HDR_VALUE:
327            if (c == ',') {
328                state = HDR_NAME;
329                *p = 0;
330                vtmp = strip_spaces(q);
331#if 0
332                printf("%s\n", ntmp);
333#endif
334                if (!vtmp) {
335                    X509V3err(X509V3_F_X509V3_PARSE_LIST,
336                              X509V3_R_INVALID_NULL_VALUE);
337                    goto err;
338                }
339                X509V3_add_value(ntmp, vtmp, &values);
340                ntmp = NULL;
341                q = p + 1;
342            }
343
344        }
345    }
346
347    if (state == HDR_VALUE) {
348        vtmp = strip_spaces(q);
349#if 0
350        printf("%s=%s\n", ntmp, vtmp);
351#endif
352        if (!vtmp) {
353            X509V3err(X509V3_F_X509V3_PARSE_LIST,
354                      X509V3_R_INVALID_NULL_VALUE);
355            goto err;
356        }
357        X509V3_add_value(ntmp, vtmp, &values);
358    } else {
359        ntmp = strip_spaces(q);
360#if 0
361        printf("%s\n", ntmp);
362#endif
363        if (!ntmp) {
364            X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
365            goto err;
366        }
367        X509V3_add_value(ntmp, NULL, &values);
368    }
369    OPENSSL_free(linebuf);
370    return values;
371
372 err:
373    OPENSSL_free(linebuf);
374    sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
375    return NULL;
376
377}
378
379/* Delete leading and trailing spaces from a string */
380static char *strip_spaces(char *name)
381{
382    char *p, *q;
383    /* Skip over leading spaces */
384    p = name;
385    while (*p && isspace((unsigned char)*p))
386        p++;
387    if (!*p)
388        return NULL;
389    q = p + strlen(p) - 1;
390    while ((q != p) && isspace((unsigned char)*q))
391        q--;
392    if (p != q)
393        q[1] = 0;
394    if (!*p)
395        return NULL;
396    return p;
397}
398
399/* hex string utilities */
400
401/*
402 * Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its
403 * hex representation @@@ (Contents of buffer are always kept in ASCII, also
404 * on EBCDIC machines)
405 */
406
407char *hex_to_string(const unsigned char *buffer, long len)
408{
409    char *tmp, *q;
410    const unsigned char *p;
411    int i;
412    const static char hexdig[] = "0123456789ABCDEF";
413    if (!buffer || !len)
414        return NULL;
415    if (!(tmp = OPENSSL_malloc(len * 3 + 1))) {
416        X509V3err(X509V3_F_HEX_TO_STRING, ERR_R_MALLOC_FAILURE);
417        return NULL;
418    }
419    q = tmp;
420    for (i = 0, p = buffer; i < len; i++, p++) {
421        *q++ = hexdig[(*p >> 4) & 0xf];
422        *q++ = hexdig[*p & 0xf];
423        *q++ = ':';
424    }
425    q[-1] = 0;
426#ifdef CHARSET_EBCDIC
427    ebcdic2ascii(tmp, tmp, q - tmp - 1);
428#endif
429
430    return tmp;
431}
432
433/*
434 * Give a string of hex digits convert to a buffer
435 */
436
437unsigned char *string_to_hex(const char *str, long *len)
438{
439    unsigned char *hexbuf, *q;
440    unsigned char ch, cl, *p;
441    if (!str) {
442        X509V3err(X509V3_F_STRING_TO_HEX, X509V3_R_INVALID_NULL_ARGUMENT);
443        return NULL;
444    }
445    if (!(hexbuf = OPENSSL_malloc(strlen(str) >> 1)))
446        goto err;
447    for (p = (unsigned char *)str, q = hexbuf; *p;) {
448        ch = *p++;
449#ifdef CHARSET_EBCDIC
450        ch = os_toebcdic[ch];
451#endif
452        if (ch == ':')
453            continue;
454        cl = *p++;
455#ifdef CHARSET_EBCDIC
456        cl = os_toebcdic[cl];
457#endif
458        if (!cl) {
459            X509V3err(X509V3_F_STRING_TO_HEX, X509V3_R_ODD_NUMBER_OF_DIGITS);
460            OPENSSL_free(hexbuf);
461            return NULL;
462        }
463        if (isupper(ch))
464            ch = tolower(ch);
465        if (isupper(cl))
466            cl = tolower(cl);
467
468        if ((ch >= '0') && (ch <= '9'))
469            ch -= '0';
470        else if ((ch >= 'a') && (ch <= 'f'))
471            ch -= 'a' - 10;
472        else
473            goto badhex;
474
475        if ((cl >= '0') && (cl <= '9'))
476            cl -= '0';
477        else if ((cl >= 'a') && (cl <= 'f'))
478            cl -= 'a' - 10;
479        else
480            goto badhex;
481
482        *q++ = (ch << 4) | cl;
483    }
484
485    if (len)
486        *len = q - hexbuf;
487
488    return hexbuf;
489
490 err:
491    if (hexbuf)
492        OPENSSL_free(hexbuf);
493    X509V3err(X509V3_F_STRING_TO_HEX, ERR_R_MALLOC_FAILURE);
494    return NULL;
495
496 badhex:
497    OPENSSL_free(hexbuf);
498    X509V3err(X509V3_F_STRING_TO_HEX, X509V3_R_ILLEGAL_HEX_DIGIT);
499    return NULL;
500
501}
502
503/*
504 * V2I name comparison function: returns zero if 'name' matches cmp or cmp.*
505 */
506
507int name_cmp(const char *name, const char *cmp)
508{
509    int len, ret;
510    char c;
511    len = strlen(cmp);
512    if ((ret = strncmp(name, cmp, len)))
513        return ret;
514    c = name[len];
515    if (!c || (c == '.'))
516        return 0;
517    return 1;
518}
519
520static int sk_strcmp(const char *const *a, const char *const *b)
521{
522    return strcmp(*a, *b);
523}
524
525STACK_OF(OPENSSL_STRING) *X509_get1_email(X509 *x)
526{
527    GENERAL_NAMES *gens;
528    STACK_OF(OPENSSL_STRING) *ret;
529
530    gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
531    ret = get_email(X509_get_subject_name(x), gens);
532    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
533    return ret;
534}
535
536STACK_OF(OPENSSL_STRING) *X509_get1_ocsp(X509 *x)
537{
538    AUTHORITY_INFO_ACCESS *info;
539    STACK_OF(OPENSSL_STRING) *ret = NULL;
540    int i;
541
542    info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL);
543    if (!info)
544        return NULL;
545    for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++) {
546        ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i);
547        if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
548            if (ad->location->type == GEN_URI) {
549                if (!append_ia5
550                    (&ret, ad->location->d.uniformResourceIdentifier))
551                    break;
552            }
553        }
554    }
555    AUTHORITY_INFO_ACCESS_free(info);
556    return ret;
557}
558
559STACK_OF(OPENSSL_STRING) *X509_REQ_get1_email(X509_REQ *x)
560{
561    GENERAL_NAMES *gens;
562    STACK_OF(X509_EXTENSION) *exts;
563    STACK_OF(OPENSSL_STRING) *ret;
564
565    exts = X509_REQ_get_extensions(x);
566    gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
567    ret = get_email(X509_REQ_get_subject_name(x), gens);
568    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
569    sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
570    return ret;
571}
572
573static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
574                                           GENERAL_NAMES *gens)
575{
576    STACK_OF(OPENSSL_STRING) *ret = NULL;
577    X509_NAME_ENTRY *ne;
578    ASN1_IA5STRING *email;
579    GENERAL_NAME *gen;
580    int i;
581    /* Now add any email address(es) to STACK */
582    i = -1;
583    /* First supplied X509_NAME */
584    while ((i = X509_NAME_get_index_by_NID(name,
585                                           NID_pkcs9_emailAddress, i)) >= 0) {
586        ne = X509_NAME_get_entry(name, i);
587        email = X509_NAME_ENTRY_get_data(ne);
588        if (!append_ia5(&ret, email))
589            return NULL;
590    }
591    for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
592        gen = sk_GENERAL_NAME_value(gens, i);
593        if (gen->type != GEN_EMAIL)
594            continue;
595        if (!append_ia5(&ret, gen->d.ia5))
596            return NULL;
597    }
598    return ret;
599}
600
601static void str_free(OPENSSL_STRING str)
602{
603    OPENSSL_free(str);
604}
605
606static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email)
607{
608    char *emtmp;
609    /* First some sanity checks */
610    if (email->type != V_ASN1_IA5STRING)
611        return 1;
612    if (!email->data || !email->length)
613        return 1;
614    if (!*sk)
615        *sk = sk_OPENSSL_STRING_new(sk_strcmp);
616    if (!*sk)
617        return 0;
618    /* Don't add duplicates */
619    if (sk_OPENSSL_STRING_find(*sk, (char *)email->data) != -1)
620        return 1;
621    emtmp = BUF_strdup((char *)email->data);
622    if (!emtmp || !sk_OPENSSL_STRING_push(*sk, emtmp)) {
623        X509_email_free(*sk);
624        *sk = NULL;
625        return 0;
626    }
627    return 1;
628}
629
630void X509_email_free(STACK_OF(OPENSSL_STRING) *sk)
631{
632    sk_OPENSSL_STRING_pop_free(sk, str_free);
633}
634
635/*
636 * Convert IP addresses both IPv4 and IPv6 into an OCTET STRING compatible
637 * with RFC3280.
638 */
639
640ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
641{
642    unsigned char ipout[16];
643    ASN1_OCTET_STRING *ret;
644    int iplen;
645
646    /* If string contains a ':' assume IPv6 */
647
648    iplen = a2i_ipadd(ipout, ipasc);
649
650    if (!iplen)
651        return NULL;
652
653    ret = ASN1_OCTET_STRING_new();
654    if (!ret)
655        return NULL;
656    if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) {
657        ASN1_OCTET_STRING_free(ret);
658        return NULL;
659    }
660    return ret;
661}
662
663ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)
664{
665    ASN1_OCTET_STRING *ret = NULL;
666    unsigned char ipout[32];
667    char *iptmp = NULL, *p;
668    int iplen1, iplen2;
669    p = strchr(ipasc, '/');
670    if (!p)
671        return NULL;
672    iptmp = BUF_strdup(ipasc);
673    if (!iptmp)
674        return NULL;
675    p = iptmp + (p - ipasc);
676    *p++ = 0;
677
678    iplen1 = a2i_ipadd(ipout, iptmp);
679
680    if (!iplen1)
681        goto err;
682
683    iplen2 = a2i_ipadd(ipout + iplen1, p);
684
685    OPENSSL_free(iptmp);
686    iptmp = NULL;
687
688    if (!iplen2 || (iplen1 != iplen2))
689        goto err;
690
691    ret = ASN1_OCTET_STRING_new();
692    if (!ret)
693        goto err;
694    if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
695        goto err;
696
697    return ret;
698
699 err:
700    if (iptmp)
701        OPENSSL_free(iptmp);
702    if (ret)
703        ASN1_OCTET_STRING_free(ret);
704    return NULL;
705}
706
707int a2i_ipadd(unsigned char *ipout, const char *ipasc)
708{
709    /* If string contains a ':' assume IPv6 */
710
711    if (strchr(ipasc, ':')) {
712        if (!ipv6_from_asc(ipout, ipasc))
713            return 0;
714        return 16;
715    } else {
716        if (!ipv4_from_asc(ipout, ipasc))
717            return 0;
718        return 4;
719    }
720}
721
722static int ipv4_from_asc(unsigned char *v4, const char *in)
723{
724    int a0, a1, a2, a3;
725    if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
726        return 0;
727    if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
728        || (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
729        return 0;
730    v4[0] = a0;
731    v4[1] = a1;
732    v4[2] = a2;
733    v4[3] = a3;
734    return 1;
735}
736
737typedef struct {
738    /* Temporary store for IPV6 output */
739    unsigned char tmp[16];
740    /* Total number of bytes in tmp */
741    int total;
742    /* The position of a zero (corresponding to '::') */
743    int zero_pos;
744    /* Number of zeroes */
745    int zero_cnt;
746} IPV6_STAT;
747
748static int ipv6_from_asc(unsigned char *v6, const char *in)
749{
750    IPV6_STAT v6stat;
751    v6stat.total = 0;
752    v6stat.zero_pos = -1;
753    v6stat.zero_cnt = 0;
754    /*
755     * Treat the IPv6 representation as a list of values separated by ':'.
756     * The presence of a '::' will parse as one, two or three zero length
757     * elements.
758     */
759    if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
760        return 0;
761
762    /* Now for some sanity checks */
763
764    if (v6stat.zero_pos == -1) {
765        /* If no '::' must have exactly 16 bytes */
766        if (v6stat.total != 16)
767            return 0;
768    } else {
769        /* If '::' must have less than 16 bytes */
770        if (v6stat.total == 16)
771            return 0;
772        /* More than three zeroes is an error */
773        if (v6stat.zero_cnt > 3)
774            return 0;
775        /* Can only have three zeroes if nothing else present */
776        else if (v6stat.zero_cnt == 3) {
777            if (v6stat.total > 0)
778                return 0;
779        }
780        /* Can only have two zeroes if at start or end */
781        else if (v6stat.zero_cnt == 2) {
782            if ((v6stat.zero_pos != 0)
783                && (v6stat.zero_pos != v6stat.total))
784                return 0;
785        } else
786            /* Can only have one zero if *not* start or end */
787        {
788            if ((v6stat.zero_pos == 0)
789                || (v6stat.zero_pos == v6stat.total))
790                return 0;
791        }
792    }
793
794    /* Format result */
795
796    if (v6stat.zero_pos >= 0) {
797        /* Copy initial part */
798        memcpy(v6, v6stat.tmp, v6stat.zero_pos);
799        /* Zero middle */
800        memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
801        /* Copy final part */
802        if (v6stat.total != v6stat.zero_pos)
803            memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
804                   v6stat.tmp + v6stat.zero_pos,
805                   v6stat.total - v6stat.zero_pos);
806    } else
807        memcpy(v6, v6stat.tmp, 16);
808
809    return 1;
810}
811
812static int ipv6_cb(const char *elem, int len, void *usr)
813{
814    IPV6_STAT *s = usr;
815    /* Error if 16 bytes written */
816    if (s->total == 16)
817        return 0;
818    if (len == 0) {
819        /* Zero length element, corresponds to '::' */
820        if (s->zero_pos == -1)
821            s->zero_pos = s->total;
822        /* If we've already got a :: its an error */
823        else if (s->zero_pos != s->total)
824            return 0;
825        s->zero_cnt++;
826    } else {
827        /* If more than 4 characters could be final a.b.c.d form */
828        if (len > 4) {
829            /* Need at least 4 bytes left */
830            if (s->total > 12)
831                return 0;
832            /* Must be end of string */
833            if (elem[len])
834                return 0;
835            if (!ipv4_from_asc(s->tmp + s->total, elem))
836                return 0;
837            s->total += 4;
838        } else {
839            if (!ipv6_hex(s->tmp + s->total, elem, len))
840                return 0;
841            s->total += 2;
842        }
843    }
844    return 1;
845}
846
847/*
848 * Convert a string of up to 4 hex digits into the corresponding IPv6 form.
849 */
850
851static int ipv6_hex(unsigned char *out, const char *in, int inlen)
852{
853    unsigned char c;
854    unsigned int num = 0;
855    if (inlen > 4)
856        return 0;
857    while (inlen--) {
858        c = *in++;
859        num <<= 4;
860        if ((c >= '0') && (c <= '9'))
861            num |= c - '0';
862        else if ((c >= 'A') && (c <= 'F'))
863            num |= c - 'A' + 10;
864        else if ((c >= 'a') && (c <= 'f'))
865            num |= c - 'a' + 10;
866        else
867            return 0;
868    }
869    out[0] = num >> 8;
870    out[1] = num & 0xff;
871    return 1;
872}
873
874int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE) *dn_sk,
875                             unsigned long chtype)
876{
877    CONF_VALUE *v;
878    int i, mval;
879    char *p, *type;
880    if (!nm)
881        return 0;
882
883    for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) {
884        v = sk_CONF_VALUE_value(dn_sk, i);
885        type = v->name;
886        /*
887         * Skip past any leading X. X: X, etc to allow for multiple instances
888         */
889        for (p = type; *p; p++)
890#ifndef CHARSET_EBCDIC
891            if ((*p == ':') || (*p == ',') || (*p == '.'))
892#else
893            if ((*p == os_toascii[':']) || (*p == os_toascii[','])
894                || (*p == os_toascii['.']))
895#endif
896            {
897                p++;
898                if (*p)
899                    type = p;
900                break;
901            }
902#ifndef CHARSET_EBCDIC
903        if (*type == '+')
904#else
905        if (*type == os_toascii['+'])
906#endif
907        {
908            mval = -1;
909            type++;
910        } else
911            mval = 0;
912        if (!X509_NAME_add_entry_by_txt(nm, type, chtype,
913                                        (unsigned char *)v->value, -1, -1,
914                                        mval))
915            return 0;
916
917    }
918    return 1;
919}
920