/* $OpenBSD: x509_utl.c,v 1.22 2024/08/31 18:38:46 tb Exp $ */ /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL * project. */ /* ==================================================================== * Copyright (c) 1999-2003 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * licensing@OpenSSL.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ #include #include #include #include #include #include #include #include #include #include "conf_local.h" #include "bytestring.h" static char *bn_to_string(const BIGNUM *bn); static char *strip_spaces(char *name); static int sk_strcmp(const char * const *a, const char * const *b); static STACK_OF(OPENSSL_STRING) *get_email(X509_NAME *name, GENERAL_NAMES *gens); static void str_free(OPENSSL_STRING str); static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email); static int ipv4_from_asc(unsigned char *v4, const char *in); static int ipv6_from_asc(unsigned char *v6, const char *in); static int ipv6_cb(const char *elem, int len, void *usr); static int ipv6_hex(unsigned char *out, const char *in, int inlen); /* Add a CONF_VALUE name-value pair to stack. */ int X509V3_add_value(const char *name, const char *value, STACK_OF(CONF_VALUE) **out_extlist) { STACK_OF(CONF_VALUE) *extlist = NULL; CONF_VALUE *conf_value = NULL; int ret = 0; if ((conf_value = calloc(1, sizeof(*conf_value))) == NULL) { X509V3error(ERR_R_MALLOC_FAILURE); goto err; } if (name != NULL) { if ((conf_value->name = strdup(name)) == NULL) { X509V3error(ERR_R_MALLOC_FAILURE); goto err; } } if (value != NULL) { if ((conf_value->value = strdup(value)) == NULL) { X509V3error(ERR_R_MALLOC_FAILURE); goto err; } } if ((extlist = *out_extlist) == NULL) extlist = sk_CONF_VALUE_new_null(); if (extlist == NULL) { X509V3error(ERR_R_MALLOC_FAILURE); goto err; } if (!sk_CONF_VALUE_push(extlist, conf_value)) { X509V3error(ERR_R_MALLOC_FAILURE); goto err; } conf_value = NULL; *out_extlist = extlist; extlist = NULL; ret = 1; err: if (extlist != *out_extlist) sk_CONF_VALUE_pop_free(extlist, X509V3_conf_free); X509V3_conf_free(conf_value); return ret; } int X509V3_add_value_uchar(const char *name, const unsigned char *value, STACK_OF(CONF_VALUE) **extlist) { return X509V3_add_value(name, (const char *)value, extlist); } /* Free function for STACK_OF(CONF_VALUE) */ void X509V3_conf_free(CONF_VALUE *conf) { if (!conf) return; free(conf->name); free(conf->value); free(conf->section); free(conf); } LCRYPTO_ALIAS(X509V3_conf_free); int X509V3_add_value_bool(const char *name, int asn1_bool, STACK_OF(CONF_VALUE) **extlist) { if (asn1_bool) return X509V3_add_value(name, "TRUE", extlist); return X509V3_add_value(name, "FALSE", extlist); } static char * bn_to_string(const BIGNUM *bn) { const char *sign = ""; char *bnstr, *hex; char *ret = NULL; /* Only display small numbers in decimal, as conversion is quadratic. */ if (BN_num_bits(bn) < 128) return BN_bn2dec(bn); if ((hex = bnstr = BN_bn2hex(bn)) == NULL) goto err; if (BN_is_negative(bn)) { sign = "-"; hex++; } if (asprintf(&ret, "%s0x%s", sign, hex) == -1) ret = NULL; err: free(bnstr); return ret; } char * i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, const ASN1_ENUMERATED *a) { BIGNUM *bntmp; char *strtmp = NULL; if (a == NULL) return NULL; if ((bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) == NULL || (strtmp = bn_to_string(bntmp)) == NULL) X509V3error(ERR_R_MALLOC_FAILURE); BN_free(bntmp); return strtmp; } LCRYPTO_ALIAS(i2s_ASN1_ENUMERATED); char * i2s_ASN1_ENUMERATED_TABLE(X509V3_EXT_METHOD *method, const ASN1_ENUMERATED *e) { const BIT_STRING_BITNAME *enam; long strval; strval = ASN1_ENUMERATED_get(e); for (enam = method->usr_data; enam->lname; enam++) { if (strval == enam->bitnum) return strdup(enam->lname); } return i2s_ASN1_ENUMERATED(method, e); } LCRYPTO_ALIAS(i2s_ASN1_ENUMERATED_TABLE); char * i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, const ASN1_INTEGER *a) { BIGNUM *bntmp; char *strtmp = NULL; if (a == NULL) return NULL; if ((bntmp = ASN1_INTEGER_to_BN(a, NULL)) == NULL || (strtmp = bn_to_string(bntmp)) == NULL) X509V3error(ERR_R_MALLOC_FAILURE); BN_free(bntmp); return strtmp; } LCRYPTO_ALIAS(i2s_ASN1_INTEGER); ASN1_INTEGER * s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, const char *value) { BIGNUM *bn = NULL; ASN1_INTEGER *aint; int isneg = 0, ishex = 0; int ret; if (!value) { X509V3error(X509V3_R_INVALID_NULL_VALUE); return NULL; } if ((bn = BN_new()) == NULL) { X509V3error(ERR_R_MALLOC_FAILURE); return NULL; } if (value[0] == '-') { value++; isneg = 1; } if (value[0] == '0' && (value[1] == 'x' || value[1] == 'X')) { value += 2; ishex = 1; } if (ishex) ret = BN_hex2bn(&bn, value); else ret = BN_dec2bn(&bn, value); if (!ret || value[ret]) { BN_free(bn); X509V3error(X509V3_R_BN_DEC2BN_ERROR); return NULL; } if (BN_is_zero(bn)) isneg = 0; aint = BN_to_ASN1_INTEGER(bn, NULL); BN_free(bn); if (!aint) { X509V3error(X509V3_R_BN_TO_ASN1_INTEGER_ERROR); return NULL; } if (isneg) aint->type |= V_ASN1_NEG; return aint; } LCRYPTO_ALIAS(s2i_ASN1_INTEGER); int X509V3_add_value_int(const char *name, const ASN1_INTEGER *aint, STACK_OF(CONF_VALUE) **extlist) { char *strtmp; int ret; if (!aint) return 1; if (!(strtmp = i2s_ASN1_INTEGER(NULL, aint))) return 0; ret = X509V3_add_value(name, strtmp, extlist); free(strtmp); return ret; } int X509V3_get_value_bool(const CONF_VALUE *value, int *asn1_bool) { char *btmp; if (!(btmp = value->value)) goto err; if (!strcmp(btmp, "TRUE") || !strcmp(btmp, "true") || !strcmp(btmp, "Y") || !strcmp(btmp, "y") || !strcmp(btmp, "YES") || !strcmp(btmp, "yes")) { *asn1_bool = 0xff; return 1; } else if (!strcmp(btmp, "FALSE") || !strcmp(btmp, "false") || !strcmp(btmp, "N") || !strcmp(btmp, "n") || !strcmp(btmp, "NO") || !strcmp(btmp, "no")) { *asn1_bool = 0; return 1; } err: X509V3error(X509V3_R_INVALID_BOOLEAN_STRING); X509V3_conf_err(value); return 0; } int X509V3_get_value_int(const CONF_VALUE *value, ASN1_INTEGER **aint) { ASN1_INTEGER *itmp; if (!(itmp = s2i_ASN1_INTEGER(NULL, value->value))) { X509V3_conf_err(value); return 0; } *aint = itmp; return 1; } #define HDR_NAME 1 #define HDR_VALUE 2 /*#define DEBUG*/ STACK_OF(CONF_VALUE) * X509V3_parse_list(const char *line) { char *p, *q, c; char *ntmp, *vtmp; STACK_OF(CONF_VALUE) *values = NULL; char *linebuf; int state; /* We are going to modify the line so copy it first */ if ((linebuf = strdup(line)) == NULL) { X509V3error(ERR_R_MALLOC_FAILURE); goto err; } state = HDR_NAME; ntmp = NULL; /* Go through all characters */ for (p = linebuf, q = linebuf; (c = *p) && (c != '\r') && (c != '\n'); p++) { switch (state) { case HDR_NAME: if (c == ':') { state = HDR_VALUE; *p = 0; ntmp = strip_spaces(q); if (!ntmp) { X509V3error(X509V3_R_INVALID_NULL_NAME); goto err; } q = p + 1; } else if (c == ',') { *p = 0; ntmp = strip_spaces(q); q = p + 1; if (!ntmp) { X509V3error(X509V3_R_INVALID_NULL_NAME); goto err; } X509V3_add_value(ntmp, NULL, &values); } break; case HDR_VALUE: if (c == ',') { state = HDR_NAME; *p = 0; vtmp = strip_spaces(q); if (!vtmp) { X509V3error(X509V3_R_INVALID_NULL_VALUE); goto err; } X509V3_add_value(ntmp, vtmp, &values); ntmp = NULL; q = p + 1; } } } if (state == HDR_VALUE) { vtmp = strip_spaces(q); if (!vtmp) { X509V3error(X509V3_R_INVALID_NULL_VALUE); goto err; } X509V3_add_value(ntmp, vtmp, &values); } else { ntmp = strip_spaces(q); if (!ntmp) { X509V3error(X509V3_R_INVALID_NULL_NAME); goto err; } X509V3_add_value(ntmp, NULL, &values); } free(linebuf); return values; err: free(linebuf); sk_CONF_VALUE_pop_free(values, X509V3_conf_free); return NULL; } LCRYPTO_ALIAS(X509V3_parse_list); /* Delete leading and trailing spaces from a string */ static char * strip_spaces(char *name) { char *p, *q; /* Skip over leading spaces */ p = name; while (*p && isspace((unsigned char)*p)) p++; if (!*p) return NULL; q = p + strlen(p) - 1; while ((q != p) && isspace((unsigned char)*q)) q--; if (p != q) q[1] = 0; if (!*p) return NULL; return p; } static const char hex_digits[] = "0123456789ABCDEF"; char * hex_to_string(const unsigned char *buffer, long len) { CBB cbb; CBS cbs; uint8_t *out = NULL; uint8_t c; size_t out_len; if (!CBB_init(&cbb, 0)) goto err; if (len < 0) goto err; CBS_init(&cbs, buffer, len); while (CBS_len(&cbs) > 0) { if (!CBS_get_u8(&cbs, &c)) goto err; if (!CBB_add_u8(&cbb, hex_digits[c >> 4])) goto err; if (!CBB_add_u8(&cbb, hex_digits[c & 0xf])) goto err; if (CBS_len(&cbs) > 0) { if (!CBB_add_u8(&cbb, ':')) goto err; } } if (!CBB_add_u8(&cbb, '\0')) goto err; if (!CBB_finish(&cbb, &out, &out_len)) goto err; err: CBB_cleanup(&cbb); return out; } LCRYPTO_ALIAS(hex_to_string); static int x509_skip_colons_cbs(CBS *cbs) { uint8_t c; while (CBS_len(cbs) > 0) { if (!CBS_peek_u8(cbs, &c)) return 0; if (c != ':') return 1; if (!CBS_get_u8(cbs, &c)) return 0; } return 1; } static int x509_get_xdigit_nibble_cbs(CBS *cbs, uint8_t *out_nibble) { uint8_t c; if (!CBS_get_u8(cbs, &c)) return 0; if (c >= '0' && c <= '9') { *out_nibble = c - '0'; return 1; } if (c >= 'a' && c <= 'f') { *out_nibble = c - 'a' + 10; return 1; } if (c >= 'A' && c <= 'F') { *out_nibble = c - 'A' + 10; return 1; } X509V3error(X509V3_R_ILLEGAL_HEX_DIGIT); return 0; } unsigned char * string_to_hex(const char *str, long *len) { CBB cbb; CBS cbs; uint8_t *out = NULL; size_t out_len; uint8_t hi, lo; *len = 0; if (!CBB_init(&cbb, 0)) goto err; if (str == NULL) { X509V3error(X509V3_R_INVALID_NULL_ARGUMENT); goto err; } CBS_init(&cbs, str, strlen(str)); while (CBS_len(&cbs) > 0) { /* * Skipping only a single colon between two pairs of digits * would make more sense - history... */ if (!x509_skip_colons_cbs(&cbs)) goto err; /* Another historic idiocy. */ if (CBS_len(&cbs) == 0) break; if (!x509_get_xdigit_nibble_cbs(&cbs, &hi)) goto err; if (CBS_len(&cbs) == 0) { X509V3error(X509V3_R_ODD_NUMBER_OF_DIGITS); goto err; } if (!x509_get_xdigit_nibble_cbs(&cbs, &lo)) goto err; if (!CBB_add_u8(&cbb, hi << 4 | lo)) goto err; } if (!CBB_finish(&cbb, &out, &out_len)) goto err; if (out_len > LONG_MAX) { freezero(out, out_len); out = NULL; goto err; } *len = out_len; err: CBB_cleanup(&cbb); return out; } LCRYPTO_ALIAS(string_to_hex); /* V2I name comparison function: returns zero if 'name' matches * cmp or cmp.* */ int name_cmp(const char *name, const char *cmp) { int len, ret; char c; len = strlen(cmp); if ((ret = strncmp(name, cmp, len))) return ret; c = name[len]; if (!c || (c=='.')) return 0; return 1; } static int sk_strcmp(const char * const *a, const char * const *b) { return strcmp(*a, *b); } STACK_OF(OPENSSL_STRING) * X509_get1_email(X509 *x) { GENERAL_NAMES *gens; STACK_OF(OPENSSL_STRING) *ret; gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL); ret = get_email(X509_get_subject_name(x), gens); sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free); return ret; } LCRYPTO_ALIAS(X509_get1_email); STACK_OF(OPENSSL_STRING) * X509_get1_ocsp(X509 *x) { AUTHORITY_INFO_ACCESS *info; STACK_OF(OPENSSL_STRING) *ret = NULL; int i; info = X509_get_ext_d2i(x, NID_info_access, NULL, NULL); if (!info) return NULL; for (i = 0; i < sk_ACCESS_DESCRIPTION_num(info); i++) { ACCESS_DESCRIPTION *ad = sk_ACCESS_DESCRIPTION_value(info, i); if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) { if (ad->location->type == GEN_URI) { if (!append_ia5(&ret, ad->location->d.uniformResourceIdentifier)) break; } } } AUTHORITY_INFO_ACCESS_free(info); return ret; } LCRYPTO_ALIAS(X509_get1_ocsp); STACK_OF(OPENSSL_STRING) * X509_REQ_get1_email(X509_REQ *x) { GENERAL_NAMES *gens; STACK_OF(X509_EXTENSION) *exts; STACK_OF(OPENSSL_STRING) *ret; exts = X509_REQ_get_extensions(x); gens = X509V3_get_d2i(exts, NID_subject_alt_name, NULL, NULL); ret = get_email(X509_REQ_get_subject_name(x), gens); sk_GENERAL_NAME_pop_free(gens, GENERAL_NAME_free); sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free); return ret; } LCRYPTO_ALIAS(X509_REQ_get1_email); static STACK_OF(OPENSSL_STRING) * get_email(X509_NAME *name, GENERAL_NAMES *gens) { STACK_OF(OPENSSL_STRING) *ret = NULL; X509_NAME_ENTRY *ne; ASN1_IA5STRING *email; GENERAL_NAME *gen; int i; /* Now add any email address(es) to STACK */ i = -1; /* First supplied X509_NAME */ while ((i = X509_NAME_get_index_by_NID(name, NID_pkcs9_emailAddress, i)) >= 0) { ne = X509_NAME_get_entry(name, i); email = X509_NAME_ENTRY_get_data(ne); if (!append_ia5(&ret, email)) return NULL; } for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) { gen = sk_GENERAL_NAME_value(gens, i); if (gen->type != GEN_EMAIL) continue; if (!append_ia5(&ret, gen->d.ia5)) return NULL; } return ret; } static void str_free(OPENSSL_STRING str) { free(str); } static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, ASN1_IA5STRING *email) { char *emtmp; /* First some sanity checks */ if (email->type != V_ASN1_IA5STRING) return 1; if (!email->data || !email->length) return 1; if (!*sk) *sk = sk_OPENSSL_STRING_new(sk_strcmp); if (!*sk) return 0; /* Don't add duplicates */ if (sk_OPENSSL_STRING_find(*sk, (char *)email->data) != -1) return 1; emtmp = strdup((char *)email->data); if (!emtmp || !sk_OPENSSL_STRING_push(*sk, emtmp)) { X509_email_free(*sk); *sk = NULL; return 0; } return 1; } void X509_email_free(STACK_OF(OPENSSL_STRING) *sk) { sk_OPENSSL_STRING_pop_free(sk, str_free); } LCRYPTO_ALIAS(X509_email_free); typedef int (*equal_fn)(const unsigned char *pattern, size_t pattern_len, const unsigned char *subject, size_t subject_len, unsigned int flags); /* Skip pattern prefix to match "wildcard" subject */ static void skip_prefix(const unsigned char **p, size_t *plen, const unsigned char *subject, size_t subject_len, unsigned int flags) { const unsigned char *pattern = *p; size_t pattern_len = *plen; /* * If subject starts with a leading '.' followed by more octets, and * pattern is longer, compare just an equal-length suffix with the * full subject (starting at the '.'), provided the prefix contains * no NULs. */ if ((flags & _X509_CHECK_FLAG_DOT_SUBDOMAINS) == 0) return; while (pattern_len > subject_len && *pattern) { if ((flags & X509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS) && *pattern == '.') break; ++pattern; --pattern_len; } /* Skip if entire prefix acceptable */ if (pattern_len == subject_len) { *p = pattern; *plen = pattern_len; } } /* * Open/BoringSSL uses memcmp for "equal_case" while their * "equal_nocase" function is a hand-rolled strncasecmp that does not * allow \0 in the pattern. Since an embedded \0 is likely a sign of * problems, we simply don't allow it in either case, and then we use * standard libc functions. */ /* Compare using strncasecmp */ static int equal_nocase(const unsigned char *pattern, size_t pattern_len, const unsigned char *subject, size_t subject_len, unsigned int flags) { if (memchr(pattern, '\0', pattern_len) != NULL) return 0; if (memchr(subject, '\0', subject_len) != NULL) return 0; skip_prefix(&pattern, &pattern_len, subject, subject_len, flags); if (pattern_len != subject_len) return 0; return (strncasecmp(pattern, subject, pattern_len) == 0); } /* Compare using strncmp. */ static int equal_case(const unsigned char *pattern, size_t pattern_len, const unsigned char *subject, size_t subject_len, unsigned int flags) { if (memchr(pattern, 0, pattern_len) != NULL) return 0; if (memchr(subject, 0, subject_len) != NULL) return 0; skip_prefix(&pattern, &pattern_len, subject, subject_len, flags); if (pattern_len != subject_len) return 0; return (strncmp(pattern, subject, pattern_len) == 0); } /* * RFC 5280, section 7.5, requires that only the domain is compared in a * case-insensitive manner. */ static int equal_email(const unsigned char *a, size_t a_len, const unsigned char *b, size_t b_len, unsigned int unused_flags) { size_t pos = a_len; if (a_len != b_len) return 0; /* * We search backwards for the '@' character, so that we do not have to * deal with quoted local-parts. The domain part is compared in a * case-insensitive manner. */ while (pos > 0) { pos--; if (a[pos] == '@' || b[pos] == '@') { if (!equal_nocase(a + pos, a_len - pos, b + pos, a_len - pos, 0)) return 0; break; } } if (pos == 0) pos = a_len; return equal_case(a, pos, b, pos, 0); } /* * Compare the prefix and suffix with the subject, and check that the * characters in-between are valid. */ static int wildcard_match(const unsigned char *prefix, size_t prefix_len, const unsigned char *suffix, size_t suffix_len, const unsigned char *subject, size_t subject_len, unsigned int flags) { const unsigned char *wildcard_start; const unsigned char *wildcard_end; const unsigned char *p; int allow_multi = 0; int allow_idna = 0; if (subject_len < prefix_len + suffix_len) return 0; if (!equal_nocase(prefix, prefix_len, subject, prefix_len, flags)) return 0; wildcard_start = subject + prefix_len; wildcard_end = subject + (subject_len - suffix_len); if (!equal_nocase(wildcard_end, suffix_len, suffix, suffix_len, flags)) return 0; /* * If the wildcard makes up the entire first label, it must match at * least one character. */ if (prefix_len == 0 && *suffix == '.') { if (wildcard_start == wildcard_end) return 0; allow_idna = 1; if (flags & X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS) allow_multi = 1; } /* IDNA labels cannot match partial wildcards */ if (!allow_idna && subject_len >= 4 && strncasecmp((char *)subject, "xn--", 4) == 0) return 0; /* The wildcard may match a literal '*' */ if (wildcard_end == wildcard_start + 1 && *wildcard_start == '*') return 1; /* * Check that the part matched by the wildcard contains only * permitted characters and only matches a single label unless * allow_multi is set. */ for (p = wildcard_start; p != wildcard_end; ++p) if (!(('0' <= *p && *p <= '9') || ('A' <= *p && *p <= 'Z') || ('a' <= *p && *p <= 'z') || *p == '-' || (allow_multi && *p == '.'))) return 0; return 1; } #define LABEL_START (1 << 0) #define LABEL_END (1 << 1) #define LABEL_HYPHEN (1 << 2) #define LABEL_IDNA (1 << 3) static const unsigned char * valid_star(const unsigned char *p, size_t len, unsigned int flags) { const unsigned char *star = 0; size_t i; int state = LABEL_START; int dots = 0; for (i = 0; i < len; ++i) { /* * Locate first and only legal wildcard, either at the start * or end of a non-IDNA first and not final label. */ if (p[i] == '*') { int atstart = (state & LABEL_START); int atend = (i == len - 1 || p[i + 1] == '.'); /* * At most one wildcard per pattern. * No wildcards in IDNA labels. * No wildcards after the first label. */ if (star != NULL || (state & LABEL_IDNA) != 0 || dots) return NULL; /* Only full-label '*.example.com' wildcards? */ if ((flags & X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS) && (!atstart || !atend)) return NULL; /* No 'foo*bar' wildcards */ if (!atstart && !atend) return NULL; star = &p[i]; state &= ~LABEL_START; } else if ((state & LABEL_START) != 0) { /* * At the start of a label, skip any "xn--" and * remain in the LABEL_START state, but set the * IDNA label state */ if ((state & LABEL_IDNA) == 0 && len - i >= 4 && strncasecmp((char *)&p[i], "xn--", 4) == 0) { i += 3; state |= LABEL_IDNA; continue; } /* Labels must start with a letter or digit */ state &= ~LABEL_START; if (('a' <= p[i] && p[i] <= 'z') || ('A' <= p[i] && p[i] <= 'Z') || ('0' <= p[i] && p[i] <= '9')) continue; return NULL; } else if (('a' <= p[i] && p[i] <= 'z') || ('A' <= p[i] && p[i] <= 'Z') || ('0' <= p[i] && p[i] <= '9')) { state &= LABEL_IDNA; continue; } else if (p[i] == '.') { if (state & (LABEL_HYPHEN | LABEL_START)) return NULL; state = LABEL_START; ++dots; } else if (p[i] == '-') { /* no domain/subdomain starts with '-' */ if ((state & LABEL_START) != 0) return NULL; state |= LABEL_HYPHEN; } else return NULL; } /* * The final label must not end in a hyphen or ".", and * there must be at least two dots after the star. */ if ((state & (LABEL_START | LABEL_HYPHEN)) != 0 || dots < 2) return NULL; return star; } /* Compare using wildcards. */ static int equal_wildcard(const unsigned char *pattern, size_t pattern_len, const unsigned char *subject, size_t subject_len, unsigned int flags) { const unsigned char *star = NULL; /* * Subject names starting with '.' can only match a wildcard pattern * via a subject sub-domain pattern suffix match. */ if (!(subject_len > 1 && subject[0] == '.')) star = valid_star(pattern, pattern_len, flags); if (star == NULL) return equal_nocase(pattern, pattern_len, subject, subject_len, flags); return wildcard_match(pattern, star - pattern, star + 1, (pattern + pattern_len) - star - 1, subject, subject_len, flags); } /* * Compare an ASN1_STRING to a supplied string. If they match return 1. If * cmp_type > 0 only compare if string matches the type, otherwise convert it * to UTF8. */ static int do_check_string(ASN1_STRING *a, int cmp_type, equal_fn equal, unsigned int flags, const char *b, size_t blen, char **peername) { int rv = 0; if (!a->data || !a->length) return 0; if (cmp_type > 0) { if (cmp_type != a->type) return 0; if (cmp_type == V_ASN1_IA5STRING) rv = equal(a->data, a->length, (unsigned char *)b, blen, flags); else if (a->length == (int)blen && !memcmp(a->data, b, blen)) rv = 1; if (rv > 0 && peername && (*peername = strndup((char *)a->data, a->length)) == NULL) rv = -1; } else { int astrlen; unsigned char *astr = NULL; astrlen = ASN1_STRING_to_UTF8(&astr, a); if (astrlen < 0) return -1; rv = equal(astr, astrlen, (unsigned char *)b, blen, flags); if (rv > 0 && peername && (*peername = strndup((char *)astr, astrlen)) == NULL) rv = -1; free(astr); } return rv; } static int do_x509_check(X509 *x, const char *chk, size_t chklen, unsigned int flags, int check_type, char **peername) { GENERAL_NAMES *gens = NULL; X509_NAME *name = NULL; size_t i; int j; int cnid = NID_undef; int alt_type; int san_present = 0; int rv = 0; equal_fn equal; /* See below, this flag is internal-only */ flags &= ~_X509_CHECK_FLAG_DOT_SUBDOMAINS; if (check_type == GEN_EMAIL) { cnid = NID_pkcs9_emailAddress; alt_type = V_ASN1_IA5STRING; equal = equal_email; } else if (check_type == GEN_DNS) { if (!(flags & X509_CHECK_FLAG_NEVER_CHECK_SUBJECT)) cnid = NID_commonName; /* Implicit client-side DNS sub-domain pattern */ if (chklen > 1 && chk[0] == '.') flags |= _X509_CHECK_FLAG_DOT_SUBDOMAINS; alt_type = V_ASN1_IA5STRING; if (flags & X509_CHECK_FLAG_NO_WILDCARDS) equal = equal_nocase; else equal = equal_wildcard; } else { alt_type = V_ASN1_OCTET_STRING; equal = equal_case; } gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL); if (gens != NULL) { for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) { GENERAL_NAME *gen; ASN1_STRING *cstr; gen = sk_GENERAL_NAME_value(gens, i); if (gen->type != check_type) continue; san_present = 1; if (check_type == GEN_EMAIL) cstr = gen->d.rfc822Name; else if (check_type == GEN_DNS) cstr = gen->d.dNSName; else cstr = gen->d.iPAddress; /* Positive on success, negative on error! */ if ((rv = do_check_string(cstr, alt_type, equal, flags, chk, chklen, peername)) != 0) break; } GENERAL_NAMES_free(gens); if (rv != 0) return rv; if (cnid == NID_undef || (san_present && !(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT))) return 0; } /* We're done if CN-ID is not pertinent */ if (cnid == NID_undef) return 0; j = -1; name = X509_get_subject_name(x); while ((j = X509_NAME_get_index_by_NID(name, cnid, j)) >= 0) { X509_NAME_ENTRY *ne; ASN1_STRING *str; if ((ne = X509_NAME_get_entry(name, j)) == NULL) return -1; if ((str = X509_NAME_ENTRY_get_data(ne)) == NULL) return -1; /* Positive on success, negative on error! */ if ((rv = do_check_string(str, -1, equal, flags, chk, chklen, peername)) != 0) return rv; } return 0; } int X509_check_host(X509 *x, const char *chk, size_t chklen, unsigned int flags, char **peername) { if (chk == NULL) return -2; if (chklen == 0) chklen = strlen(chk); else if (memchr(chk, '\0', chklen)) return -2; return do_x509_check(x, chk, chklen, flags, GEN_DNS, peername); } LCRYPTO_ALIAS(X509_check_host); int X509_check_email(X509 *x, const char *chk, size_t chklen, unsigned int flags) { if (chk == NULL) return -2; if (chklen == 0) chklen = strlen(chk); else if (memchr(chk, '\0', chklen)) return -2; return do_x509_check(x, chk, chklen, flags, GEN_EMAIL, NULL); } LCRYPTO_ALIAS(X509_check_email); int X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen, unsigned int flags) { if (chk == NULL) return -2; return do_x509_check(x, (char *)chk, chklen, flags, GEN_IPADD, NULL); } LCRYPTO_ALIAS(X509_check_ip); int X509_check_ip_asc(X509 *x, const char *ipasc, unsigned int flags) { unsigned char ipout[16]; size_t iplen; if (ipasc == NULL) return -2; iplen = (size_t)a2i_ipadd(ipout, ipasc); if (iplen == 0) return -2; return do_x509_check(x, (char *)ipout, iplen, flags, GEN_IPADD, NULL); } LCRYPTO_ALIAS(X509_check_ip_asc); /* Convert IP addresses both IPv4 and IPv6 into an * OCTET STRING compatible with RFC3280. */ ASN1_OCTET_STRING * a2i_IPADDRESS(const char *ipasc) { unsigned char ipout[16]; ASN1_OCTET_STRING *ret; int iplen; /* If string contains a ':' assume IPv6 */ iplen = a2i_ipadd(ipout, ipasc); if (!iplen) return NULL; ret = ASN1_OCTET_STRING_new(); if (!ret) return NULL; if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) { ASN1_OCTET_STRING_free(ret); return NULL; } return ret; } LCRYPTO_ALIAS(a2i_IPADDRESS); ASN1_OCTET_STRING * a2i_IPADDRESS_NC(const char *ipasc) { ASN1_OCTET_STRING *ret = NULL; unsigned char ipout[32]; char *iptmp = NULL, *p; int iplen1, iplen2; p = strchr(ipasc, '/'); if (!p) return NULL; iptmp = strdup(ipasc); if (!iptmp) return NULL; p = iptmp + (p - ipasc); *p++ = 0; iplen1 = a2i_ipadd(ipout, iptmp); if (!iplen1) goto err; iplen2 = a2i_ipadd(ipout + iplen1, p); free(iptmp); iptmp = NULL; if (!iplen2 || (iplen1 != iplen2)) goto err; ret = ASN1_OCTET_STRING_new(); if (!ret) goto err; if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2)) goto err; return ret; err: free(iptmp); if (ret) ASN1_OCTET_STRING_free(ret); return NULL; } LCRYPTO_ALIAS(a2i_IPADDRESS_NC); int a2i_ipadd(unsigned char *ipout, const char *ipasc) { /* If string contains a ':' assume IPv6 */ if (strchr(ipasc, ':')) { if (!ipv6_from_asc(ipout, ipasc)) return 0; return 16; } else { if (!ipv4_from_asc(ipout, ipasc)) return 0; return 4; } } LCRYPTO_ALIAS(a2i_ipadd); static int ipv4_from_asc(unsigned char *v4, const char *in) { int a0, a1, a2, a3; if (sscanf(in, "%d.%d.%d.%d", &a0, &a1, &a2, &a3) != 4) return 0; if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255) || (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255)) return 0; v4[0] = a0; v4[1] = a1; v4[2] = a2; v4[3] = a3; return 1; } typedef struct { /* Temporary store for IPV6 output */ unsigned char tmp[16]; /* Total number of bytes in tmp */ int total; /* The position of a zero (corresponding to '::') */ int zero_pos; /* Number of zeroes */ int zero_cnt; } IPV6_STAT; static int ipv6_from_asc(unsigned char *v6, const char *in) { IPV6_STAT v6stat; v6stat.total = 0; v6stat.zero_pos = -1; v6stat.zero_cnt = 0; /* * Treat the IPv6 representation as a list of values separated by ':'. * The presence of a '::' will parse as one (e.g., "2001:db8::1"), * two (e.g., "2001:db8::") or three (e.g., "::") zero length elements. */ if (!CONF_parse_list(in, ':', 0, ipv6_cb, &v6stat)) return 0; /* Now for some sanity checks */ if (v6stat.zero_pos == -1) { /* If no '::' must have exactly 16 bytes */ if (v6stat.total != 16) return 0; } else { /* If '::' must have less than 16 bytes */ if (v6stat.total == 16) return 0; /* More than three zeroes is an error */ if (v6stat.zero_cnt > 3) return 0; /* Can only have three zeroes if nothing else present */ else if (v6stat.zero_cnt == 3) { if (v6stat.total > 0) return 0; } /* Can only have two zeroes if at start or end */ else if (v6stat.zero_cnt == 2) { if ((v6stat.zero_pos != 0) && (v6stat.zero_pos != v6stat.total)) return 0; } else /* Can only have one zero if *not* start or end */ { if ((v6stat.zero_pos == 0) || (v6stat.zero_pos == v6stat.total)) return 0; } } /* Format result */ if (v6stat.zero_pos >= 0) { /* Copy initial part */ memcpy(v6, v6stat.tmp, v6stat.zero_pos); /* Zero middle */ memset(v6 + v6stat.zero_pos, 0, 16 - v6stat.total); /* Copy final part */ if (v6stat.total != v6stat.zero_pos) memcpy(v6 + v6stat.zero_pos + 16 - v6stat.total, v6stat.tmp + v6stat.zero_pos, v6stat.total - v6stat.zero_pos); } else memcpy(v6, v6stat.tmp, 16); return 1; } static int ipv6_cb(const char *elem, int len, void *usr) { IPV6_STAT *s = usr; /* Error if 16 bytes written */ if (s->total == 16) return 0; if (len == 0) { /* Zero length element, corresponds to '::' */ if (s->zero_pos == -1) s->zero_pos = s->total; /* If we've already got a :: its an error */ else if (s->zero_pos != s->total) return 0; s->zero_cnt++; } else { /* If more than 4 characters could be final a.b.c.d form */ if (len > 4) { /* Need at least 4 bytes left */ if (s->total > 12) return 0; /* Must be end of string */ if (elem[len]) return 0; if (!ipv4_from_asc(s->tmp + s->total, elem)) return 0; s->total += 4; } else { if (!ipv6_hex(s->tmp + s->total, elem, len)) return 0; s->total += 2; } } return 1; } /* Convert a string of up to 4 hex digits into the corresponding * IPv6 form. */ static int ipv6_hex(unsigned char *out, const char *in, int inlen) { unsigned char c; unsigned int num = 0; if (inlen > 4) return 0; while (inlen--) { c = *in++; num <<= 4; if ((c >= '0') && (c <= '9')) num |= c - '0'; else if ((c >= 'A') && (c <= 'F')) num |= c - 'A' + 10; else if ((c >= 'a') && (c <= 'f')) num |= c - 'a' + 10; else return 0; } out[0] = num >> 8; out[1] = num & 0xff; return 1; } int X509V3_NAME_from_section(X509_NAME *nm, STACK_OF(CONF_VALUE)*dn_sk, unsigned long chtype) { CONF_VALUE *v; int i, mval; char *p, *type; if (!nm) return 0; for (i = 0; i < sk_CONF_VALUE_num(dn_sk); i++) { v = sk_CONF_VALUE_value(dn_sk, i); type = v->name; /* Skip past any leading X. X: X, etc to allow for * multiple instances */ for (p = type; *p; p++) if ((*p == ':') || (*p == ',') || (*p == '.')) { p++; if (*p) type = p; break; } if (*type == '+') { mval = -1; type++; } else mval = 0; if (!X509_NAME_add_entry_by_txt(nm, type, chtype, (unsigned char *) v->value, -1, -1, mval)) return 0; } return 1; } LCRYPTO_ALIAS(X509V3_NAME_from_section);