v3_utl.c revision 280304 
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    state = HDR_NAME;
289    ntmp = NULL;
290    /* Go through all characters */
291    for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n');
292         p++) {
293
294        switch (state) {
295        case HDR_NAME:
296            if (c == ':') {
297                state = HDR_VALUE;
298                *p = 0;
299                ntmp = strip_spaces(q);
300                if (!ntmp) {
301                    X509V3err(X509V3_F_X509V3_PARSE_LIST,
302                              X509V3_R_INVALID_NULL_NAME);
303                    goto err;
304                }
305                q = p + 1;
306            } else if (c == ',') {
307                *p = 0;
308                ntmp = strip_spaces(q);
309                q = p + 1;
310#if 0
311                printf("%s\n", ntmp);
312#endif
313                if (!ntmp) {
314                    X509V3err(X509V3_F_X509V3_PARSE_LIST,
315                              X509V3_R_INVALID_NULL_NAME);
316                    goto err;
317                }
318                X509V3_add_value(ntmp, NULL, &values);
319            }
320            break;
321
322        case HDR_VALUE:
323            if (c == ',') {
324                state = HDR_NAME;
325                *p = 0;
326                vtmp = strip_spaces(q);
327#if 0
328                printf("%s\n", ntmp);
329#endif
330                if (!vtmp) {
331                    X509V3err(X509V3_F_X509V3_PARSE_LIST,
332                              X509V3_R_INVALID_NULL_VALUE);
333                    goto err;
334                }
335                X509V3_add_value(ntmp, vtmp, &values);
336                ntmp = NULL;
337                q = p + 1;
338            }
339
340        }
341    }
342
343    if (state == HDR_VALUE) {
344        vtmp = strip_spaces(q);
345#if 0
346        printf("%s=%s\n", ntmp, vtmp);
347#endif
348        if (!vtmp) {
349            X509V3err(X509V3_F_X509V3_PARSE_LIST,
350                      X509V3_R_INVALID_NULL_VALUE);
351            goto err;
352        }
353        X509V3_add_value(ntmp, vtmp, &values);
354    } else {
355        ntmp = strip_spaces(q);
356#if 0
357        printf("%s\n", ntmp);
358#endif
359        if (!ntmp) {
360            X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
361            goto err;
362        }
363        X509V3_add_value(ntmp, NULL, &values);
364    }
365    OPENSSL_free(linebuf);
366    return values;
367
368 err:
369    OPENSSL_free(linebuf);
370    sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
371    return NULL;
372
373}
374
375/* Delete leading and trailing spaces from a string */
376static char *strip_spaces(char *name)
377{
378    char *p, *q;
379    /* Skip over leading spaces */
380    p = name;
381    while (*p && isspace((unsigned char)*p))
382        p++;
383    if (!*p)
384        return NULL;
385    q = p + strlen(p) - 1;
386    while ((q != p) && isspace((unsigned char)*q))
387        q--;
388    if (p != q)
389        q[1] = 0;
390    if (!*p)
391        return NULL;
392    return p;
393}
394
395/* hex string utilities */
396
397/*
398 * Given a buffer of length 'len' return a OPENSSL_malloc'ed string with its
399 * hex representation @@@ (Contents of buffer are always kept in ASCII, also
400 * on EBCDIC machines)
401 */
402
403char *hex_to_string(const unsigned char *buffer, long len)
404{
405    char *tmp, *q;
406    const unsigned char *p;
407    int i;
408    const static char hexdig[] = "0123456789ABCDEF";
409    if (!buffer || !len)
410        return NULL;
411    if (!(tmp = OPENSSL_malloc(len * 3 + 1))) {
412        X509V3err(X509V3_F_HEX_TO_STRING, ERR_R_MALLOC_FAILURE);
413        return NULL;
414    }
415    q = tmp;
416    for (i = 0, p = buffer; i < len; i++, p++) {
417        *q++ = hexdig[(*p >> 4) & 0xf];
418        *q++ = hexdig[*p & 0xf];
419        *q++ = ':';
420    }
421    q[-1] = 0;
422#ifdef CHARSET_EBCDIC
423    ebcdic2ascii(tmp, tmp, q - tmp - 1);
424#endif
425
426    return tmp;
427}
428
429/*
430 * Give a string of hex digits convert to a buffer
431 */
432
433unsigned char *string_to_hex(const char *str, long *len)
434{
435    unsigned char *hexbuf, *q;
436    unsigned char ch, cl, *p;
437    if (!str) {
438        X509V3err(X509V3_F_STRING_TO_HEX, X509V3_R_INVALID_NULL_ARGUMENT);
439        return NULL;
440    }
441    if (!(hexbuf = OPENSSL_malloc(strlen(str) >> 1)))
442        goto err;
443    for (p = (unsigned char *)str, q = hexbuf; *p;) {
444        ch = *p++;
445#ifdef CHARSET_EBCDIC
446        ch = os_toebcdic[ch];
447#endif
448        if (ch == ':')
449            continue;
450        cl = *p++;
451#ifdef CHARSET_EBCDIC
452        cl = os_toebcdic[cl];
453#endif
454        if (!cl) {
455            X509V3err(X509V3_F_STRING_TO_HEX, X509V3_R_ODD_NUMBER_OF_DIGITS);
456            OPENSSL_free(hexbuf);
457            return NULL;
458        }
459        if (isupper(ch))
460            ch = tolower(ch);
461        if (isupper(cl))
462            cl = tolower(cl);
463
464        if ((ch >= '0') && (ch <= '9'))
465            ch -= '0';
466        else if ((ch >= 'a') && (ch <= 'f'))
467            ch -= 'a' - 10;
468        else
469            goto badhex;
470
471        if ((cl >= '0') && (cl <= '9'))
472            cl -= '0';
473        else if ((cl >= 'a') && (cl <= 'f'))
474            cl -= 'a' - 10;
475        else
476            goto badhex;
477
478        *q++ = (ch << 4) | cl;
479    }
480
481    if (len)
482        *len = q - hexbuf;
483
484    return hexbuf;
485
486 err:
487    if (hexbuf)
488        OPENSSL_free(hexbuf);
489    X509V3err(X509V3_F_STRING_TO_HEX, ERR_R_MALLOC_FAILURE);
490    return NULL;
491
492 badhex:
493    OPENSSL_free(hexbuf);
494    X509V3err(X509V3_F_STRING_TO_HEX, X509V3_R_ILLEGAL_HEX_DIGIT);
495    return NULL;
496
497}
498
499/*
500 * V2I name comparison function: returns zero if 'name' matches cmp or cmp.*
501 */
502
503int name_cmp(const char *name, const char *cmp)
504{
505    int len, ret;
506    char c;
507    len = strlen(cmp);
508    if ((ret = strncmp(name, cmp, len)))
509        return ret;
510    c = name[len];
511    if (!c || (c == '.'))
512        return 0;
513    return 1;
514}
515
516static int sk_strcmp(const char *const *a, const char *const *b)
517{
518    return strcmp(*a, *b);
519}
520
521STACK_OF(OPENSSL_STRING) *X509_get1_email(X509 *x)
522{
523    GENERAL_NAMES *gens;
524    STACK_OF(OPENSSL_STRING) *ret;
525
526    gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
527    ret = get_email(X509_get_subject_name(x), gens);
528    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
529    return ret;
530}
531
532STACK_OF(OPENSSL_STRING) *X509_get1_ocsp(X509 *x)
533{
534    AUTHORITY_INFO_ACCESS *info;
535    STACK_OF(OPENSSL_STRING) *ret = NULL;
536    int i;
537
538    info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL);
539    if (!info)
540        return NULL;
541    for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++) {
542        ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i);
543        if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
544            if (ad->location->type == GEN_URI) {
545                if (!append_ia5
546                    (&ret, ad->location->d.uniformResourceIdentifier))
547                    break;
548            }
549        }
550    }
551    AUTHORITY_INFO_ACCESS_free(info);
552    return ret;
553}
554
555STACK_OF(OPENSSL_STRING) *X509_REQ_get1_email(X509_REQ *x)
556{
557    GENERAL_NAMES *gens;
558    STACK_OF(X509_EXTENSION) *exts;
559    STACK_OF(OPENSSL_STRING) *ret;
560
561    exts = X509_REQ_get_extensions(x);
562    gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL);
563    ret = get_email(X509_REQ_get_subject_name(x), gens);
564    sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free);
565    sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
566    return ret;
567}
568
569static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name,
570                                           GENERAL_NAMES *gens)
571{
572    STACK_OF(OPENSSL_STRING) *ret = NULL;
573    X509_NAME_ENTRY *ne;
574    ASN1_IA5STRING *email;
575    GENERAL_NAME *gen;
576    int i;
577    /* Now add any email address(es) to STACK */
578    i = -1;
579    /* First supplied X509_NAME */
580    while ((i = X509_NAME_get_index_by_NID(name,
581                                           NID_pkcs9_emailAddress, i)) >= 0) {
582        ne = X509_NAME_get_entry(name, i);
583        email = X509_NAME_ENTRY_get_data(ne);
584        if (!append_ia5(&ret, email))
585            return NULL;
586    }
587    for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
588        gen = sk_GENERAL_NAME_value(gens, i);
589        if (gen->type != GEN_EMAIL)
590            continue;
591        if (!append_ia5(&ret, gen->d.ia5))
592            return NULL;
593    }
594    return ret;
595}
596
597static void str_free(OPENSSL_STRING str)
598{
599    OPENSSL_free(str);
600}
601
602static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email)
603{
604    char *emtmp;
605    /* First some sanity checks */
606    if (email->type != V_ASN1_IA5STRING)
607        return 1;
608    if (!email->data || !email->length)
609        return 1;
610    if (!*sk)
611        *sk = sk_OPENSSL_STRING_new(sk_strcmp);
612    if (!*sk)
613        return 0;
614    /* Don't add duplicates */
615    if (sk_OPENSSL_STRING_find(*sk, (char *)email->data) != -1)
616        return 1;
617    emtmp = BUF_strdup((char *)email->data);
618    if (!emtmp || !sk_OPENSSL_STRING_push(*sk, emtmp)) {
619        X509_email_free(*sk);
620        *sk = NULL;
621        return 0;
622    }
623    return 1;
624}
625
626void X509_email_free(STACK_OF(OPENSSL_STRING) *sk)
627{
628    sk_OPENSSL_STRING_pop_free(sk, str_free);
629}
630
631/*
632 * Convert IP addresses both IPv4 and IPv6 into an OCTET STRING compatible
633 * with RFC3280.
634 */
635
636ASN1_OCTET_STRING *a2i_IPADDRESS(const char *ipasc)
637{
638    unsigned char ipout[16];
639    ASN1_OCTET_STRING *ret;
640    int iplen;
641
642    /* If string contains a ':' assume IPv6 */
643
644    iplen = a2i_ipadd(ipout, ipasc);
645
646    if (!iplen)
647        return NULL;
648
649    ret = ASN1_OCTET_STRING_new();
650    if (!ret)
651        return NULL;
652    if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) {
653        ASN1_OCTET_STRING_free(ret);
654        return NULL;
655    }
656    return ret;
657}
658
659ASN1_OCTET_STRING *a2i_IPADDRESS_NC(const char *ipasc)
660{
661    ASN1_OCTET_STRING *ret = NULL;
662    unsigned char ipout[32];
663    char *iptmp = NULL, *p;
664    int iplen1, iplen2;
665    p = strchr(ipasc, '/');
666    if (!p)
667        return NULL;
668    iptmp = BUF_strdup(ipasc);
669    if (!iptmp)
670        return NULL;
671    p = iptmp + (p - ipasc);
672    *p++ = 0;
673
674    iplen1 = a2i_ipadd(ipout, iptmp);
675
676    if (!iplen1)
677        goto err;
678
679    iplen2 = a2i_ipadd(ipout + iplen1, p);
680
681    OPENSSL_free(iptmp);
682    iptmp = NULL;
683
684    if (!iplen2 || (iplen1 != iplen2))
685        goto err;
686
687    ret = ASN1_OCTET_STRING_new();
688    if (!ret)
689        goto err;
690    if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2))
691        goto err;
692
693    return ret;
694
695 err:
696    if (iptmp)
697        OPENSSL_free(iptmp);
698    if (ret)
699        ASN1_OCTET_STRING_free(ret);
700    return NULL;
701}
702
703int a2i_ipadd(unsigned char *ipout, const char *ipasc)
704{
705    /* If string contains a ':' assume IPv6 */
706
707    if (strchr(ipasc, ':')) {
708        if (!ipv6_from_asc(ipout, ipasc))
709            return 0;
710        return 16;
711    } else {
712        if (!ipv4_from_asc(ipout, ipasc))
713            return 0;
714        return 4;
715    }
716}
717
718static int ipv4_from_asc(unsigned char *v4, const char *in)
719{
720    int a0, a1, a2, a3;
721    if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4)
722        return 0;
723    if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255)
724        || (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255))
725        return 0;
726    v4[0] = a0;
727    v4[1] = a1;
728    v4[2] = a2;
729    v4[3] = a3;
730    return 1;
731}
732
733typedef struct {
734    /* Temporary store for IPV6 output */
735    unsigned char tmp[16];
736    /* Total number of bytes in tmp */
737    int total;
738    /* The position of a zero (corresponding to '::') */
739    int zero_pos;
740    /* Number of zeroes */
741    int zero_cnt;
742} IPV6_STAT;
743
744static int ipv6_from_asc(unsigned char *v6, const char *in)
745{
746    IPV6_STAT v6stat;
747    v6stat.total = 0;
748    v6stat.zero_pos = -1;
749    v6stat.zero_cnt = 0;
750    /*
751     * Treat the IPv6 representation as a list of values separated by ':'.
752     * The presence of a '::' will parse as one, two or three zero length
753     * elements.
754     */
755    if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat))
756        return 0;
757
758    /* Now for some sanity checks */
759
760    if (v6stat.zero_pos == -1) {
761        /* If no '::' must have exactly 16 bytes */
762        if (v6stat.total != 16)
763            return 0;
764    } else {
765        /* If '::' must have less than 16 bytes */
766        if (v6stat.total == 16)
767            return 0;
768        /* More than three zeroes is an error */
769        if (v6stat.zero_cnt > 3)
770            return 0;
771        /* Can only have three zeroes if nothing else present */
772        else if (v6stat.zero_cnt == 3) {
773            if (v6stat.total > 0)
774                return 0;
775        }
776        /* Can only have two zeroes if at start or end */
777        else if (v6stat.zero_cnt == 2) {
778            if ((v6stat.zero_pos != 0)
779                && (v6stat.zero_pos != v6stat.total))
780                return 0;
781        } else
782            /* Can only have one zero if *not* start or end */
783        {
784            if ((v6stat.zero_pos == 0)
785                || (v6stat.zero_pos == v6stat.total))
786                return 0;
787        }
788    }
789
790    /* Format result */
791
792    if (v6stat.zero_pos >= 0) {
793        /* Copy initial part */
794        memcpy(v6, v6stat.tmp, v6stat.zero_pos);
795        /* Zero middle */
796        memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total);
797        /* Copy final part */
798        if (v6stat.total != v6stat.zero_pos)
799            memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total,
800                   v6stat.tmp + v6stat.zero_pos,
801                   v6stat.total - v6stat.zero_pos);
802    } else
803        memcpy(v6, v6stat.tmp, 16);
804
805    return 1;
806}
807
808static int ipv6_cb(const char *elem, int len, void *usr)
809{
810    IPV6_STAT *s = usr;
811    /* Error if 16 bytes written */
812    if (s->total == 16)
813        return 0;
814    if (len == 0) {
815        /* Zero length element, corresponds to '::' */
816        if (s->zero_pos == -1)
817            s->zero_pos = s->total;
818        /* If we've already got a :: its an error */
819        else if (s->zero_pos != s->total)
820            return 0;
821        s->zero_cnt++;
822    } else {
823        /* If more than 4 characters could be final a.b.c.d form */
824        if (len > 4) {
825            /* Need at least 4 bytes left */
826            if (s->total > 12)
827                return 0;
828            /* Must be end of string */
829            if (elem[len])
830                return 0;
831            if (!ipv4_from_asc(s->tmp + s->total, elem))
832                return 0;
833            s->total += 4;
834        } else {
835            if (!ipv6_hex(s->tmp + s->total, elem, len))
836                return 0;
837            s->total += 2;
838        }
839    }
840    return 1;
841}
842
843/*
844 * Convert a string of up to 4 hex digits into the corresponding IPv6 form.
845 */
846
847static int ipv6_hex(unsigned char *out, const char *in, int inlen)
848{
849    unsigned char c;
850    unsigned int num = 0;
851    if (inlen > 4)
852        return 0;
853    while (inlen--) {
854        c = *in++;
855        num <<= 4;
856        if ((c >= '0') && (c <= '9'))
857            num |= c - '0';
858        else if ((c >= 'A') && (c <= 'F'))
859            num |= c - 'A' + 10;
860        else if ((c >= 'a') && (c <= 'f'))
861            num |= c - 'a' + 10;
862        else
863            return 0;
864    }
865    out[0] = num >> 8;
866    out[1] = num & 0xff;
867    return 1;
868}
869
870int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE) *dn_sk,
871                             unsigned long chtype)
872{
873    CONF_VALUE *v;
874    int i, mval;
875    char *p, *type;
876    if (!nm)
877        return 0;
878
879    for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) {
880        v = sk_CONF_VALUE_value(dn_sk, i);
881        type = v->name;
882        /*
883         * Skip past any leading X. X: X, etc to allow for multiple instances
884         */
885        for (p = type; *p; p++)
886#ifndef CHARSET_EBCDIC
887            if ((*p == ':') || (*p == ',') || (*p == '.'))
888#else
889            if ((*p == os_toascii[':']) || (*p == os_toascii[','])
890                || (*p == os_toascii['.']))
891#endif
892            {
893                p++;
894                if (*p)
895                    type = p;
896                break;
897            }
898#ifndef CHARSET_EBCDIC
899        if (*type == '+')
900#else
901        if (*type == os_toascii['+'])
902#endif
903        {
904            mval = -1;
905            type++;
906        } else
907            mval = 0;
908        if (!X509_NAME_add_entry_by_txt(nm, type, chtype,
909                                        (unsigned char *)v->value, -1, -1,
910                                        mval))
911            return 0;
912
913    }
914    return 1;
915}
916