| /* |
| * Copyright 1999-2022 The OpenSSL Project Authors. All Rights Reserved. |
| * |
| * Licensed under the Apache License 2.0 (the "License"). You may not use |
| * this file except in compliance with the License. You can obtain a copy |
| * in the file LICENSE in the source distribution or at |
| * https://www.openssl.org/source/license.html |
| */ |
| |
| /* X509 v3 extension utilities */ |
| |
| #include "internal/e_os.h" |
| #include "internal/cryptlib.h" |
| #include <stdio.h> |
| #include <string.h> |
| #include "crypto/ctype.h" |
| #include <openssl/conf.h> |
| #include <openssl/crypto.h> |
| #include <openssl/x509v3.h> |
| #include "crypto/x509.h" |
| #include <openssl/bn.h> |
| #include "ext_dat.h" |
| #include "x509_local.h" |
| |
| 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(const X509_NAME *name, |
| GENERAL_NAMES *gens); |
| static void str_free(OPENSSL_STRING str); |
| static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, |
| const 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 */ |
| |
| static int x509v3_add_len_value(const char *name, const char *value, |
| size_t vallen, STACK_OF(CONF_VALUE) **extlist) |
| { |
| CONF_VALUE *vtmp = NULL; |
| char *tname = NULL, *tvalue = NULL; |
| int sk_allocated = (*extlist == NULL); |
| |
| if (name != NULL && (tname = OPENSSL_strdup(name)) == NULL) |
| goto err; |
| if (value != NULL) { |
| /* We don't allow embedded NUL characters */ |
| if (memchr(value, 0, vallen) != NULL) |
| goto err; |
| tvalue = OPENSSL_strndup(value, vallen); |
| if (tvalue == NULL) |
| goto err; |
| } |
| if ((vtmp = OPENSSL_malloc(sizeof(*vtmp))) == NULL) |
| goto err; |
| if (sk_allocated && (*extlist = sk_CONF_VALUE_new_null()) == NULL) |
| goto err; |
| vtmp->section = NULL; |
| vtmp->name = tname; |
| vtmp->value = tvalue; |
| if (!sk_CONF_VALUE_push(*extlist, vtmp)) |
| goto err; |
| return 1; |
| err: |
| ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE); |
| if (sk_allocated) { |
| sk_CONF_VALUE_free(*extlist); |
| *extlist = NULL; |
| } |
| OPENSSL_free(vtmp); |
| OPENSSL_free(tname); |
| OPENSSL_free(tvalue); |
| return 0; |
| } |
| |
| int X509V3_add_value(const char *name, const char *value, |
| STACK_OF(CONF_VALUE) **extlist) |
| { |
| return x509v3_add_len_value(name, value, |
| value != NULL ? strlen((const char *)value) : 0, |
| extlist); |
| } |
| |
| int X509V3_add_value_uchar(const char *name, const unsigned char *value, |
| STACK_OF(CONF_VALUE) **extlist) |
| { |
| return x509v3_add_len_value(name, (const char *)value, |
| value != NULL ? strlen((const char *)value) : 0, |
| extlist); |
| } |
| |
| int x509v3_add_len_value_uchar(const char *name, const unsigned char *value, |
| size_t vallen, STACK_OF(CONF_VALUE) **extlist) |
| { |
| return x509v3_add_len_value(name, (const char *)value, vallen, extlist); |
| } |
| |
| /* Free function for STACK_OF(CONF_VALUE) */ |
| |
| void X509V3_conf_free(CONF_VALUE *conf) |
| { |
| if (!conf) |
| return; |
| OPENSSL_free(conf->name); |
| OPENSSL_free(conf->value); |
| OPENSSL_free(conf->section); |
| OPENSSL_free(conf); |
| } |
| |
| 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); |
| } |
| |
| int X509V3_add_value_bool_nf(const char *name, int asn1_bool, |
| STACK_OF(CONF_VALUE) **extlist) |
| { |
| if (asn1_bool) |
| return X509V3_add_value(name, "TRUE", extlist); |
| return 1; |
| } |
| |
| static char *bignum_to_string(const BIGNUM *bn) |
| { |
| char *tmp, *ret; |
| size_t len; |
| |
| /* |
| * Display large numbers in hex and small numbers in decimal. Converting to |
| * decimal takes quadratic time and is no more useful than hex for large |
| * numbers. |
| */ |
| if (BN_num_bits(bn) < 128) |
| return BN_bn2dec(bn); |
| |
| tmp = BN_bn2hex(bn); |
| if (tmp == NULL) |
| return NULL; |
| |
| len = strlen(tmp) + 3; |
| ret = OPENSSL_malloc(len); |
| if (ret == NULL) { |
| ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE); |
| OPENSSL_free(tmp); |
| return NULL; |
| } |
| |
| /* Prepend "0x", but place it after the "-" if negative. */ |
| if (tmp[0] == '-') { |
| OPENSSL_strlcpy(ret, "-0x", len); |
| OPENSSL_strlcat(ret, tmp + 1, len); |
| } else { |
| OPENSSL_strlcpy(ret, "0x", len); |
| OPENSSL_strlcat(ret, tmp, len); |
| } |
| OPENSSL_free(tmp); |
| return ret; |
| } |
| |
| char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, const ASN1_ENUMERATED *a) |
| { |
| BIGNUM *bntmp = NULL; |
| char *strtmp = NULL; |
| |
| if (!a) |
| return NULL; |
| if ((bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) == NULL |
| || (strtmp = bignum_to_string(bntmp)) == NULL) |
| ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE); |
| BN_free(bntmp); |
| return strtmp; |
| } |
| |
| char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, const ASN1_INTEGER *a) |
| { |
| BIGNUM *bntmp = NULL; |
| char *strtmp = NULL; |
| |
| if (!a) |
| return NULL; |
| if ((bntmp = ASN1_INTEGER_to_BN(a, NULL)) == NULL |
| || (strtmp = bignum_to_string(bntmp)) == NULL) |
| ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE); |
| BN_free(bntmp); |
| return strtmp; |
| } |
| |
| ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, const char *value) |
| { |
| BIGNUM *bn = NULL; |
| ASN1_INTEGER *aint; |
| int isneg, ishex; |
| int ret; |
| |
| if (value == NULL) { |
| ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NULL_VALUE); |
| return NULL; |
| } |
| bn = BN_new(); |
| if (bn == NULL) { |
| ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE); |
| return NULL; |
| } |
| if (value[0] == '-') { |
| value++; |
| isneg = 1; |
| } else { |
| isneg = 0; |
| } |
| |
| if (value[0] == '0' && ((value[1] == 'x') || (value[1] == 'X'))) { |
| value += 2; |
| ishex = 1; |
| } else { |
| ishex = 0; |
| } |
| |
| if (ishex) |
| ret = BN_hex2bn(&bn, value); |
| else |
| ret = BN_dec2bn(&bn, value); |
| |
| if (!ret || value[ret]) { |
| BN_free(bn); |
| ERR_raise(ERR_LIB_X509V3, X509V3_R_BN_DEC2BN_ERROR); |
| return NULL; |
| } |
| |
| if (isneg && BN_is_zero(bn)) |
| isneg = 0; |
| |
| aint = BN_to_ASN1_INTEGER(bn, NULL); |
| BN_free(bn); |
| if (!aint) { |
| ERR_raise(ERR_LIB_X509V3, X509V3_R_BN_TO_ASN1_INTEGER_ERROR); |
| return NULL; |
| } |
| if (isneg) |
| aint->type |= V_ASN1_NEG; |
| return aint; |
| } |
| |
| 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)) == NULL) |
| return 0; |
| ret = X509V3_add_value(name, strtmp, extlist); |
| OPENSSL_free(strtmp); |
| return ret; |
| } |
| |
| int X509V3_get_value_bool(const CONF_VALUE *value, int *asn1_bool) |
| { |
| const char *btmp; |
| |
| if ((btmp = value->value) == NULL) |
| goto err; |
| if (strcmp(btmp, "TRUE") == 0 |
| || strcmp(btmp, "true") == 0 |
| || strcmp(btmp, "Y") == 0 |
| || strcmp(btmp, "y") == 0 |
| || strcmp(btmp, "YES") == 0 |
| || strcmp(btmp, "yes") == 0) { |
| *asn1_bool = 0xff; |
| return 1; |
| } |
| if (strcmp(btmp, "FALSE") == 0 |
| || strcmp(btmp, "false") == 0 |
| || strcmp(btmp, "N") == 0 |
| || strcmp(btmp, "n") == 0 |
| || strcmp(btmp, "NO") == 0 |
| || strcmp(btmp, "no") == 0) { |
| *asn1_bool = 0; |
| return 1; |
| } |
| err: |
| ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_BOOLEAN_STRING); |
| X509V3_conf_add_error_name_value(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)) == NULL) { |
| X509V3_conf_add_error_name_value(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 */ |
| linebuf = OPENSSL_strdup(line); |
| if (linebuf == NULL) { |
| ERR_raise(ERR_LIB_X509V3, 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) { |
| ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_EMPTY_NAME); |
| goto err; |
| } |
| q = p + 1; |
| } else if (c == ',') { |
| *p = 0; |
| ntmp = strip_spaces(q); |
| q = p + 1; |
| if (!ntmp) { |
| ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_EMPTY_NAME); |
| goto err; |
| } |
| if (!X509V3_add_value(ntmp, NULL, &values)) { |
| goto err; |
| } |
| } |
| break; |
| |
| case HDR_VALUE: |
| if (c == ',') { |
| state = HDR_NAME; |
| *p = 0; |
| vtmp = strip_spaces(q); |
| if (!vtmp) { |
| ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NULL_VALUE); |
| goto err; |
| } |
| if (!X509V3_add_value(ntmp, vtmp, &values)) { |
| goto err; |
| } |
| ntmp = NULL; |
| q = p + 1; |
| } |
| |
| } |
| } |
| |
| if (state == HDR_VALUE) { |
| vtmp = strip_spaces(q); |
| if (!vtmp) { |
| ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_NULL_VALUE); |
| goto err; |
| } |
| if (!X509V3_add_value(ntmp, vtmp, &values)) { |
| goto err; |
| } |
| } else { |
| ntmp = strip_spaces(q); |
| if (!ntmp) { |
| ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_EMPTY_NAME); |
| goto err; |
| } |
| if (!X509V3_add_value(ntmp, NULL, &values)) { |
| goto err; |
| } |
| } |
| OPENSSL_free(linebuf); |
| return values; |
| |
| err: |
| OPENSSL_free(linebuf); |
| sk_CONF_VALUE_pop_free(values, X509V3_conf_free); |
| return NULL; |
| |
| } |
| |
| /* 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 && ossl_isspace(*p)) |
| p++; |
| if (*p == '\0') |
| return NULL; |
| q = p + strlen(p) - 1; |
| while ((q != p) && ossl_isspace(*q)) |
| q--; |
| if (p != q) |
| q[1] = 0; |
| if (*p == '\0') |
| return NULL; |
| return p; |
| } |
| |
| |
| /* |
| * V2I name comparison function: returns zero if 'name' matches cmp or cmp.* |
| */ |
| |
| int ossl_v3_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; |
| } |
| |
| 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; |
| } |
| |
| 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; |
| } |
| |
| static STACK_OF(OPENSSL_STRING) *get_email(const X509_NAME *name, |
| GENERAL_NAMES *gens) |
| { |
| STACK_OF(OPENSSL_STRING) *ret = NULL; |
| X509_NAME_ENTRY *ne; |
| const ASN1_IA5STRING *email; |
| GENERAL_NAME *gen; |
| int i = -1; |
| |
| /* Now add any email address(es) to STACK */ |
| /* 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) |
| { |
| OPENSSL_free(str); |
| } |
| |
| static int append_ia5(STACK_OF(OPENSSL_STRING) **sk, |
| const ASN1_IA5STRING *email) |
| { |
| char *emtmp; |
| |
| /* First some sanity checks */ |
| if (email->type != V_ASN1_IA5STRING) |
| return 1; |
| if (email->data == NULL || email->length == 0) |
| return 1; |
| if (memchr(email->data, 0, email->length) != NULL) |
| return 1; |
| if (*sk == NULL) |
| *sk = sk_OPENSSL_STRING_new(sk_strcmp); |
| if (*sk == NULL) |
| return 0; |
| |
| emtmp = OPENSSL_strndup((char *)email->data, email->length); |
| if (emtmp == NULL) { |
| X509_email_free(*sk); |
| *sk = NULL; |
| return 0; |
| } |
| |
| /* Don't add duplicates */ |
| if (sk_OPENSSL_STRING_find(*sk, emtmp) != -1) { |
| OPENSSL_free(emtmp); |
| return 1; |
| } |
| if (!sk_OPENSSL_STRING_push(*sk, emtmp)) { |
| OPENSSL_free(emtmp); /* free on push failure */ |
| 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); |
| } |
| |
| 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, |
| 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; |
| } |
| } |
| |
| /* Compare while ASCII ignoring case. */ |
| static int equal_nocase(const unsigned char *pattern, size_t pattern_len, |
| const unsigned char *subject, size_t subject_len, |
| unsigned int flags) |
| { |
| skip_prefix(&pattern, &pattern_len, subject_len, flags); |
| if (pattern_len != subject_len) |
| return 0; |
| while (pattern_len != 0) { |
| unsigned char l = *pattern; |
| unsigned char r = *subject; |
| |
| /* The pattern must not contain NUL characters. */ |
| if (l == 0) |
| return 0; |
| if (l != r) { |
| if ('A' <= l && l <= 'Z') |
| l = (l - 'A') + 'a'; |
| if ('A' <= r && r <= 'Z') |
| r = (r - 'A') + 'a'; |
| if (l != r) |
| return 0; |
| } |
| ++pattern; |
| ++subject; |
| --pattern_len; |
| } |
| return 1; |
| } |
| |
| /* Compare using memcmp. */ |
| static int equal_case(const unsigned char *pattern, size_t pattern_len, |
| const unsigned char *subject, size_t subject_len, |
| unsigned int flags) |
| { |
| skip_prefix(&pattern, &pattern_len, subject_len, flags); |
| if (pattern_len != subject_len) |
| return 0; |
| return !memcmp(pattern, subject, pattern_len); |
| } |
| |
| /* |
| * 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 i = 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 (i > 0) { |
| --i; |
| if (a[i] == '@' || b[i] == '@') { |
| if (!equal_nocase(a + i, a_len - i, b + i, a_len - i, 0)) |
| return 0; |
| break; |
| } |
| } |
| if (i == 0) |
| i = a_len; |
| return equal_case(a, i, b, i, 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 && HAS_CASE_PREFIX((const char *)subject, "xn--")) |
| 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 (('a' <= p[i] && p[i] <= 'z') |
| || ('A' <= p[i] && p[i] <= 'Z') |
| || ('0' <= p[i] && p[i] <= '9')) { |
| if ((state & LABEL_START) != 0 |
| && len - i >= 4 && HAS_CASE_PREFIX((const char *)&p[i], "xn--")) |
| state |= LABEL_IDNA; |
| state &= ~(LABEL_HYPHEN | LABEL_START); |
| } else if (p[i] == '.') { |
| if ((state & (LABEL_HYPHEN | LABEL_START)) != 0) |
| 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(const 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 != NULL) { |
| *peername = OPENSSL_strndup((char *)a->data, a->length); |
| if (*peername == NULL) |
| return -1; |
| } |
| } else { |
| int astrlen; |
| unsigned char *astr; |
| astrlen = ASN1_STRING_to_UTF8(&astr, a); |
| if (astrlen < 0) { |
| /* |
| * -1 could be an internal malloc failure or a decoding error from |
| * malformed input; we can't distinguish. |
| */ |
| return -1; |
| } |
| rv = equal(astr, astrlen, (unsigned char *)b, blen, flags); |
| if (rv > 0 && peername != NULL) { |
| *peername = OPENSSL_strndup((char *)astr, astrlen); |
| if (*peername == NULL) { |
| OPENSSL_free(astr); |
| return -1; |
| } |
| } |
| OPENSSL_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; |
| const X509_NAME *name = NULL; |
| int i; |
| 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) { |
| 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; |
| } |
| |
| if (chklen == 0) |
| chklen = strlen(chk); |
| |
| gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL); |
| if (gens) { |
| 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 == GEN_OTHERNAME) && (check_type == GEN_EMAIL)) { |
| if (OBJ_obj2nid(gen->d.otherName->type_id) == |
| NID_id_on_SmtpUTF8Mailbox) { |
| san_present = 1; |
| |
| /* |
| * If it is not a UTF8String then that is unexpected and we |
| * treat it as no match |
| */ |
| if (gen->d.otherName->value->type == V_ASN1_UTF8STRING) { |
| cstr = gen->d.otherName->value->value.utf8string; |
| |
| /* Positive on success, negative on error! */ |
| if ((rv = do_check_string(cstr, 0, equal, flags, |
| chk, chklen, peername)) != 0) |
| break; |
| } |
| } else |
| continue; |
| } else { |
| if ((gen->type != check_type) && (gen->type != GEN_OTHERNAME)) |
| 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 (san_present && !(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT)) |
| return 0; |
| } |
| |
| /* We're done if CN-ID is not pertinent */ |
| if (cnid == NID_undef || (flags & X509_CHECK_FLAG_NEVER_CHECK_SUBJECT)) |
| return 0; |
| |
| i = -1; |
| name = X509_get_subject_name(x); |
| while ((i = X509_NAME_get_index_by_NID(name, cnid, i)) >= 0) { |
| const X509_NAME_ENTRY *ne = X509_NAME_get_entry(name, i); |
| const ASN1_STRING *str = X509_NAME_ENTRY_get_data(ne); |
| |
| /* 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; |
| /* |
| * Embedded NULs are disallowed, except as the last character of a |
| * string of length 2 or more (tolerate caller including terminating |
| * NUL in string length). |
| */ |
| if (chklen == 0) |
| chklen = strlen(chk); |
| else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen)) |
| return -2; |
| if (chklen > 1 && chk[chklen - 1] == '\0') |
| --chklen; |
| return do_x509_check(x, chk, chklen, flags, GEN_DNS, peername); |
| } |
| |
| int X509_check_email(X509 *x, const char *chk, size_t chklen, |
| unsigned int flags) |
| { |
| if (chk == NULL) |
| return -2; |
| /* |
| * Embedded NULs are disallowed, except as the last character of a |
| * string of length 2 or more (tolerate caller including terminating |
| * NUL in string length). |
| */ |
| if (chklen == 0) |
| chklen = strlen((char *)chk); |
| else if (memchr(chk, '\0', chklen > 1 ? chklen - 1 : chklen)) |
| return -2; |
| if (chklen > 1 && chk[chklen - 1] == '\0') |
| --chklen; |
| return do_x509_check(x, chk, chklen, flags, GEN_EMAIL, NULL); |
| } |
| |
| 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); |
| } |
| |
| 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)ossl_a2i_ipadd(ipout, ipasc); |
| if (iplen == 0) |
| return -2; |
| return do_x509_check(x, (char *)ipout, iplen, flags, GEN_IPADD, NULL); |
| } |
| |
| char *ossl_ipaddr_to_asc(unsigned char *p, int len) |
| { |
| /* |
| * 40 is enough space for the longest IPv6 address + nul terminator byte |
| * XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX:XXXX\0 |
| */ |
| char buf[40], *out; |
| int i = 0, remain = 0, bytes = 0; |
| |
| switch (len) { |
| case 4: /* IPv4 */ |
| BIO_snprintf(buf, sizeof(buf), "%d.%d.%d.%d", p[0], p[1], p[2], p[3]); |
| break; |
| case 16: /* IPv6 */ |
| for (out = buf, i = 8, remain = sizeof(buf); |
| i-- > 0 && bytes >= 0; |
| remain -= bytes, out += bytes) { |
| const char *template = (i > 0 ? "%X:" : "%X"); |
| |
| bytes = BIO_snprintf(out, remain, template, p[0] << 8 | p[1]); |
| p += 2; |
| } |
| break; |
| default: |
| BIO_snprintf(buf, sizeof(buf), "<invalid length=%d>", len); |
| break; |
| } |
| return OPENSSL_strdup(buf); |
| } |
| |
| /* |
| * 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 = ossl_a2i_ipadd(ipout, ipasc); |
| |
| if (!iplen) |
| return NULL; |
| |
| ret = ASN1_OCTET_STRING_new(); |
| if (ret == NULL) |
| return NULL; |
| if (!ASN1_OCTET_STRING_set(ret, ipout, iplen)) { |
| ASN1_OCTET_STRING_free(ret); |
| return NULL; |
| } |
| return ret; |
| } |
| |
| 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 == NULL) |
| return NULL; |
| iptmp = OPENSSL_strdup(ipasc); |
| if (iptmp == NULL) |
| return NULL; |
| p = iptmp + (p - ipasc); |
| *p++ = 0; |
| |
| iplen1 = ossl_a2i_ipadd(ipout, iptmp); |
| |
| if (!iplen1) |
| goto err; |
| |
| iplen2 = ossl_a2i_ipadd(ipout + iplen1, p); |
| |
| OPENSSL_free(iptmp); |
| iptmp = NULL; |
| |
| if (!iplen2 || (iplen1 != iplen2)) |
| goto err; |
| |
| ret = ASN1_OCTET_STRING_new(); |
| if (ret == NULL) |
| goto err; |
| if (!ASN1_OCTET_STRING_set(ret, ipout, iplen1 + iplen2)) |
| goto err; |
| |
| return ret; |
| |
| err: |
| OPENSSL_free(iptmp); |
| ASN1_OCTET_STRING_free(ret); |
| return NULL; |
| } |
| |
| int ossl_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; |
| } |
| } |
| |
| static int ipv4_from_asc(unsigned char *v4, const char *in) |
| { |
| const char *p; |
| int a0, a1, a2, a3, n; |
| |
| if (sscanf(in, "%d.%d.%d.%d%n", &a0, &a1, &a2, &a3, &n) != 4) |
| return 0; |
| if ((a0 < 0) || (a0 > 255) || (a1 < 0) || (a1 > 255) |
| || (a2 < 0) || (a2 > 255) || (a3 < 0) || (a3 > 255)) |
| return 0; |
| p = in + n; |
| if (!(*p == '\0' || ossl_isspace(*p))) |
| 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, two or three 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; |
| } else if (v6stat.zero_cnt == 2) { |
| /* Can only have two zeroes if at start or end */ |
| 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; |
| int x; |
| |
| if (inlen > 4) |
| return 0; |
| while (inlen--) { |
| c = *in++; |
| num <<= 4; |
| x = OPENSSL_hexchar2int(c); |
| if (x < 0) |
| return 0; |
| num |= (char)x; |
| } |
| 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, spec_char, plus_char; |
| 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++) { |
| #ifndef CHARSET_EBCDIC |
| spec_char = ((*p == ':') || (*p == ',') || (*p == '.')); |
| #else |
| spec_char = ((*p == os_toascii[':']) || (*p == os_toascii[',']) |
| || (*p == os_toascii['.'])); |
| #endif |
| if (spec_char) { |
| p++; |
| if (*p) |
| type = p; |
| break; |
| } |
| } |
| #ifndef CHARSET_EBCDIC |
| plus_char = (*type == '+'); |
| #else |
| plus_char = (*type == os_toascii['+']); |
| #endif |
| if (plus_char) { |
| 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; |
| } |
