| /* |
| * Copyright 2003-2021 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 |
| */ |
| |
| #include "internal/cryptlib.h" |
| #include "internal/numbers.h" |
| #include "internal/safe_math.h" |
| #include <stdio.h> |
| #include "crypto/asn1.h" |
| #include <openssl/asn1t.h> |
| #include <openssl/conf.h> |
| #include <openssl/x509v3.h> |
| #include <openssl/bn.h> |
| |
| #include "crypto/x509.h" |
| #include "crypto/punycode.h" |
| #include "ext_dat.h" |
| |
| OSSL_SAFE_MATH_SIGNED(int, int) |
| |
| static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, |
| X509V3_CTX *ctx, |
| STACK_OF(CONF_VALUE) *nval); |
| static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a, |
| BIO *bp, int ind); |
| static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method, |
| STACK_OF(GENERAL_SUBTREE) *trees, BIO *bp, |
| int ind, const char *name); |
| static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip); |
| |
| static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc); |
| static int nc_match_single(GENERAL_NAME *sub, GENERAL_NAME *gen); |
| static int nc_dn(const X509_NAME *sub, const X509_NAME *nm); |
| static int nc_dns(ASN1_IA5STRING *sub, ASN1_IA5STRING *dns); |
| static int nc_email(ASN1_IA5STRING *sub, ASN1_IA5STRING *eml); |
| static int nc_email_eai(ASN1_TYPE *emltype, ASN1_IA5STRING *base); |
| static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base); |
| static int nc_ip(ASN1_OCTET_STRING *ip, ASN1_OCTET_STRING *base); |
| |
| const X509V3_EXT_METHOD ossl_v3_name_constraints = { |
| NID_name_constraints, 0, |
| ASN1_ITEM_ref(NAME_CONSTRAINTS), |
| 0, 0, 0, 0, |
| 0, 0, |
| 0, v2i_NAME_CONSTRAINTS, |
| i2r_NAME_CONSTRAINTS, 0, |
| NULL |
| }; |
| |
| ASN1_SEQUENCE(GENERAL_SUBTREE) = { |
| ASN1_SIMPLE(GENERAL_SUBTREE, base, GENERAL_NAME), |
| ASN1_IMP_OPT(GENERAL_SUBTREE, minimum, ASN1_INTEGER, 0), |
| ASN1_IMP_OPT(GENERAL_SUBTREE, maximum, ASN1_INTEGER, 1) |
| } ASN1_SEQUENCE_END(GENERAL_SUBTREE) |
| |
| ASN1_SEQUENCE(NAME_CONSTRAINTS) = { |
| ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, permittedSubtrees, |
| GENERAL_SUBTREE, 0), |
| ASN1_IMP_SEQUENCE_OF_OPT(NAME_CONSTRAINTS, excludedSubtrees, |
| GENERAL_SUBTREE, 1), |
| } ASN1_SEQUENCE_END(NAME_CONSTRAINTS) |
| |
| |
| IMPLEMENT_ASN1_ALLOC_FUNCTIONS(GENERAL_SUBTREE) |
| IMPLEMENT_ASN1_ALLOC_FUNCTIONS(NAME_CONSTRAINTS) |
| |
| |
| #define IA5_OFFSET_LEN(ia5base, offset) \ |
| ((ia5base)->length - ((unsigned char *)(offset) - (ia5base)->data)) |
| |
| /* Like memchr but for ASN1_IA5STRING. Additionally you can specify the |
| * starting point to search from |
| */ |
| # define ia5memchr(str, start, c) memchr(start, c, IA5_OFFSET_LEN(str, start)) |
| |
| /* Like memrrchr but for ASN1_IA5STRING */ |
| static char *ia5memrchr(ASN1_IA5STRING *str, int c) |
| { |
| int i; |
| |
| for (i = str->length; i > 0 && str->data[i - 1] != c; i--); |
| |
| if (i == 0) |
| return NULL; |
| |
| return (char *)&str->data[i - 1]; |
| } |
| |
| /* |
| * We cannot use strncasecmp here because that applies locale specific rules. It |
| * also doesn't work with ASN1_STRINGs that may have embedded NUL characters. |
| * For example in Turkish 'I' is not the uppercase character for 'i'. We need to |
| * do a simple ASCII case comparison ignoring the locale (that is why we use |
| * numeric constants below). |
| */ |
| static int ia5ncasecmp(const char *s1, const char *s2, size_t n) |
| { |
| for (; n > 0; n--, s1++, s2++) { |
| if (*s1 != *s2) { |
| unsigned char c1 = (unsigned char)*s1, c2 = (unsigned char)*s2; |
| |
| /* Convert to lower case */ |
| if (c1 >= 0x41 /* A */ && c1 <= 0x5A /* Z */) |
| c1 += 0x20; |
| if (c2 >= 0x41 /* A */ && c2 <= 0x5A /* Z */) |
| c2 += 0x20; |
| |
| if (c1 == c2) |
| continue; |
| |
| if (c1 < c2) |
| return -1; |
| |
| /* c1 > c2 */ |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static void *v2i_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, |
| X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *nval) |
| { |
| int i; |
| CONF_VALUE tval, *val; |
| STACK_OF(GENERAL_SUBTREE) **ptree = NULL; |
| NAME_CONSTRAINTS *ncons = NULL; |
| GENERAL_SUBTREE *sub = NULL; |
| |
| ncons = NAME_CONSTRAINTS_new(); |
| if (ncons == NULL) |
| goto memerr; |
| for (i = 0; i < sk_CONF_VALUE_num(nval); i++) { |
| val = sk_CONF_VALUE_value(nval, i); |
| if (HAS_PREFIX(val->name, "permitted") && val->name[9]) { |
| ptree = &ncons->permittedSubtrees; |
| tval.name = val->name + 10; |
| } else if (HAS_PREFIX(val->name, "excluded") && val->name[8]) { |
| ptree = &ncons->excludedSubtrees; |
| tval.name = val->name + 9; |
| } else { |
| ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_SYNTAX); |
| goto err; |
| } |
| tval.value = val->value; |
| sub = GENERAL_SUBTREE_new(); |
| if (sub == NULL) |
| goto memerr; |
| if (!v2i_GENERAL_NAME_ex(sub->base, method, ctx, &tval, 1)) |
| goto err; |
| if (*ptree == NULL) |
| *ptree = sk_GENERAL_SUBTREE_new_null(); |
| if (*ptree == NULL || !sk_GENERAL_SUBTREE_push(*ptree, sub)) |
| goto memerr; |
| sub = NULL; |
| } |
| |
| return ncons; |
| |
| memerr: |
| ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE); |
| err: |
| NAME_CONSTRAINTS_free(ncons); |
| GENERAL_SUBTREE_free(sub); |
| |
| return NULL; |
| } |
| |
| static int i2r_NAME_CONSTRAINTS(const X509V3_EXT_METHOD *method, void *a, |
| BIO *bp, int ind) |
| { |
| NAME_CONSTRAINTS *ncons = a; |
| do_i2r_name_constraints(method, ncons->permittedSubtrees, |
| bp, ind, "Permitted"); |
| if (ncons->permittedSubtrees && ncons->excludedSubtrees) |
| BIO_puts(bp, "\n"); |
| do_i2r_name_constraints(method, ncons->excludedSubtrees, |
| bp, ind, "Excluded"); |
| return 1; |
| } |
| |
| static int do_i2r_name_constraints(const X509V3_EXT_METHOD *method, |
| STACK_OF(GENERAL_SUBTREE) *trees, |
| BIO *bp, int ind, const char *name) |
| { |
| GENERAL_SUBTREE *tree; |
| int i; |
| if (sk_GENERAL_SUBTREE_num(trees) > 0) |
| BIO_printf(bp, "%*s%s:\n", ind, "", name); |
| for (i = 0; i < sk_GENERAL_SUBTREE_num(trees); i++) { |
| if (i > 0) |
| BIO_puts(bp, "\n"); |
| tree = sk_GENERAL_SUBTREE_value(trees, i); |
| BIO_printf(bp, "%*s", ind + 2, ""); |
| if (tree->base->type == GEN_IPADD) |
| print_nc_ipadd(bp, tree->base->d.ip); |
| else |
| GENERAL_NAME_print(bp, tree->base); |
| } |
| return 1; |
| } |
| |
| static int print_nc_ipadd(BIO *bp, ASN1_OCTET_STRING *ip) |
| { |
| /* ip->length should be 8 or 32 and len1 == len2 == 4 or len1 == len2 == 16 */ |
| int len1 = ip->length >= 16 ? 16 : ip->length >= 4 ? 4 : ip->length; |
| int len2 = ip->length - len1; |
| char *ip1 = ossl_ipaddr_to_asc(ip->data, len1); |
| char *ip2 = ossl_ipaddr_to_asc(ip->data + len1, len2); |
| int ret = ip1 != NULL && ip2 != NULL |
| && BIO_printf(bp, "IP:%s/%s", ip1, ip2) > 0; |
| |
| OPENSSL_free(ip1); |
| OPENSSL_free(ip2); |
| return ret; |
| } |
| |
| #define NAME_CHECK_MAX (1 << 20) |
| |
| static int add_lengths(int *out, int a, int b) |
| { |
| int err = 0; |
| |
| /* sk_FOO_num(NULL) returns -1 but is effectively 0 when iterating. */ |
| if (a < 0) |
| a = 0; |
| if (b < 0) |
| b = 0; |
| |
| *out = safe_add_int(a, b, &err); |
| return !err; |
| } |
| |
| /*- |
| * Check a certificate conforms to a specified set of constraints. |
| * Return values: |
| * X509_V_OK: All constraints obeyed. |
| * X509_V_ERR_PERMITTED_VIOLATION: Permitted subtree violation. |
| * X509_V_ERR_EXCLUDED_VIOLATION: Excluded subtree violation. |
| * X509_V_ERR_SUBTREE_MINMAX: Min or max values present and matching type. |
| * X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: Unsupported constraint type. |
| * X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: bad unsupported constraint syntax. |
| * X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: bad or unsupported syntax of name |
| */ |
| |
| int NAME_CONSTRAINTS_check(X509 *x, NAME_CONSTRAINTS *nc) |
| { |
| int r, i, name_count, constraint_count; |
| X509_NAME *nm; |
| |
| nm = X509_get_subject_name(x); |
| |
| /* |
| * Guard against certificates with an excessive number of names or |
| * constraints causing a computationally expensive name constraints check. |
| */ |
| if (!add_lengths(&name_count, X509_NAME_entry_count(nm), |
| sk_GENERAL_NAME_num(x->altname)) |
| || !add_lengths(&constraint_count, |
| sk_GENERAL_SUBTREE_num(nc->permittedSubtrees), |
| sk_GENERAL_SUBTREE_num(nc->excludedSubtrees)) |
| || (name_count > 0 && constraint_count > NAME_CHECK_MAX / name_count)) |
| return X509_V_ERR_UNSPECIFIED; |
| |
| if (X509_NAME_entry_count(nm) > 0) { |
| GENERAL_NAME gntmp; |
| gntmp.type = GEN_DIRNAME; |
| gntmp.d.directoryName = nm; |
| |
| r = nc_match(&gntmp, nc); |
| |
| if (r != X509_V_OK) |
| return r; |
| |
| gntmp.type = GEN_EMAIL; |
| |
| /* Process any email address attributes in subject name */ |
| |
| for (i = -1;;) { |
| const X509_NAME_ENTRY *ne; |
| |
| i = X509_NAME_get_index_by_NID(nm, NID_pkcs9_emailAddress, i); |
| if (i == -1) |
| break; |
| ne = X509_NAME_get_entry(nm, i); |
| gntmp.d.rfc822Name = X509_NAME_ENTRY_get_data(ne); |
| if (gntmp.d.rfc822Name->type != V_ASN1_IA5STRING) |
| return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX; |
| |
| r = nc_match(&gntmp, nc); |
| |
| if (r != X509_V_OK) |
| return r; |
| } |
| |
| } |
| |
| for (i = 0; i < sk_GENERAL_NAME_num(x->altname); i++) { |
| GENERAL_NAME *gen = sk_GENERAL_NAME_value(x->altname, i); |
| r = nc_match(gen, nc); |
| if (r != X509_V_OK) |
| return r; |
| } |
| |
| return X509_V_OK; |
| |
| } |
| |
| static int cn2dnsid(ASN1_STRING *cn, unsigned char **dnsid, size_t *idlen) |
| { |
| int utf8_length; |
| unsigned char *utf8_value; |
| int i; |
| int isdnsname = 0; |
| |
| /* Don't leave outputs uninitialized */ |
| *dnsid = NULL; |
| *idlen = 0; |
| |
| /*- |
| * Per RFC 6125, DNS-IDs representing internationalized domain names appear |
| * in certificates in A-label encoded form: |
| * |
| * https://tools.ietf.org/html/rfc6125#section-6.4.2 |
| * |
| * The same applies to CNs which are intended to represent DNS names. |
| * However, while in the SAN DNS-IDs are IA5Strings, as CNs they may be |
| * needlessly encoded in 16-bit Unicode. We perform a conversion to UTF-8 |
| * to ensure that we get an ASCII representation of any CNs that are |
| * representable as ASCII, but just not encoded as ASCII. The UTF-8 form |
| * may contain some non-ASCII octets, and that's fine, such CNs are not |
| * valid legacy DNS names. |
| * |
| * Note, 'int' is the return type of ASN1_STRING_to_UTF8() so that's what |
| * we must use for 'utf8_length'. |
| */ |
| if ((utf8_length = ASN1_STRING_to_UTF8(&utf8_value, cn)) < 0) |
| return X509_V_ERR_OUT_OF_MEM; |
| |
| /* |
| * Some certificates have had names that include a *trailing* NUL byte. |
| * Remove these harmless NUL characters. They would otherwise yield false |
| * alarms with the following embedded NUL check. |
| */ |
| while (utf8_length > 0 && utf8_value[utf8_length - 1] == '\0') |
| --utf8_length; |
| |
| /* Reject *embedded* NULs */ |
| if (memchr(utf8_value, 0, utf8_length) != NULL) { |
| OPENSSL_free(utf8_value); |
| return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX; |
| } |
| |
| /* |
| * XXX: Deviation from strict DNS name syntax, also check names with '_' |
| * Check DNS name syntax, any '-' or '.' must be internal, |
| * and on either side of each '.' we can't have a '-' or '.'. |
| * |
| * If the name has just one label, we don't consider it a DNS name. This |
| * means that "CN=sometld" cannot be precluded by DNS name constraints, but |
| * that is not a problem. |
| */ |
| for (i = 0; i < utf8_length; ++i) { |
| unsigned char c = utf8_value[i]; |
| |
| if ((c >= 'a' && c <= 'z') |
| || (c >= 'A' && c <= 'Z') |
| || (c >= '0' && c <= '9') |
| || c == '_') |
| continue; |
| |
| /* Dot and hyphen cannot be first or last. */ |
| if (i > 0 && i < utf8_length - 1) { |
| if (c == '-') |
| continue; |
| /* |
| * Next to a dot the preceding and following characters must not be |
| * another dot or a hyphen. Otherwise, record that the name is |
| * plausible, since it has two or more labels. |
| */ |
| if (c == '.' |
| && utf8_value[i + 1] != '.' |
| && utf8_value[i - 1] != '-' |
| && utf8_value[i + 1] != '-') { |
| isdnsname = 1; |
| continue; |
| } |
| } |
| isdnsname = 0; |
| break; |
| } |
| |
| if (isdnsname) { |
| *dnsid = utf8_value; |
| *idlen = (size_t)utf8_length; |
| return X509_V_OK; |
| } |
| OPENSSL_free(utf8_value); |
| return X509_V_OK; |
| } |
| |
| /* |
| * Check CN against DNS-ID name constraints. |
| */ |
| int NAME_CONSTRAINTS_check_CN(X509 *x, NAME_CONSTRAINTS *nc) |
| { |
| int r, i; |
| const X509_NAME *nm = X509_get_subject_name(x); |
| ASN1_STRING stmp; |
| GENERAL_NAME gntmp; |
| |
| stmp.flags = 0; |
| stmp.type = V_ASN1_IA5STRING; |
| gntmp.type = GEN_DNS; |
| gntmp.d.dNSName = &stmp; |
| |
| /* Process any commonName attributes in subject name */ |
| |
| for (i = -1;;) { |
| X509_NAME_ENTRY *ne; |
| ASN1_STRING *cn; |
| unsigned char *idval; |
| size_t idlen; |
| |
| i = X509_NAME_get_index_by_NID(nm, NID_commonName, i); |
| if (i == -1) |
| break; |
| ne = X509_NAME_get_entry(nm, i); |
| cn = X509_NAME_ENTRY_get_data(ne); |
| |
| /* Only process attributes that look like host names */ |
| if ((r = cn2dnsid(cn, &idval, &idlen)) != X509_V_OK) |
| return r; |
| if (idlen == 0) |
| continue; |
| |
| stmp.length = idlen; |
| stmp.data = idval; |
| r = nc_match(&gntmp, nc); |
| OPENSSL_free(idval); |
| if (r != X509_V_OK) |
| return r; |
| } |
| return X509_V_OK; |
| } |
| |
| /* |
| * Return nonzero if the GeneralSubtree has valid 'minimum' field |
| * (must be absent or 0) and valid 'maximum' field (must be absent). |
| */ |
| static int nc_minmax_valid(GENERAL_SUBTREE *sub) { |
| BIGNUM *bn = NULL; |
| int ok = 1; |
| |
| if (sub->maximum) |
| ok = 0; |
| |
| if (sub->minimum) { |
| bn = ASN1_INTEGER_to_BN(sub->minimum, NULL); |
| if (bn == NULL || !BN_is_zero(bn)) |
| ok = 0; |
| BN_free(bn); |
| } |
| |
| return ok; |
| } |
| |
| static int nc_match(GENERAL_NAME *gen, NAME_CONSTRAINTS *nc) |
| { |
| GENERAL_SUBTREE *sub; |
| int i, r, match = 0; |
| /* |
| * We need to compare not gen->type field but an "effective" type because |
| * the otherName field may contain EAI email address treated specially |
| * according to RFC 8398, section 6 |
| */ |
| int effective_type = ((gen->type == GEN_OTHERNAME) && |
| (OBJ_obj2nid(gen->d.otherName->type_id) == |
| NID_id_on_SmtpUTF8Mailbox)) ? GEN_EMAIL : gen->type; |
| |
| /* |
| * Permitted subtrees: if any subtrees exist of matching the type at |
| * least one subtree must match. |
| */ |
| |
| for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->permittedSubtrees); i++) { |
| sub = sk_GENERAL_SUBTREE_value(nc->permittedSubtrees, i); |
| if (effective_type != sub->base->type) |
| continue; |
| if (!nc_minmax_valid(sub)) |
| return X509_V_ERR_SUBTREE_MINMAX; |
| /* If we already have a match don't bother trying any more */ |
| if (match == 2) |
| continue; |
| if (match == 0) |
| match = 1; |
| r = nc_match_single(gen, sub->base); |
| if (r == X509_V_OK) |
| match = 2; |
| else if (r != X509_V_ERR_PERMITTED_VIOLATION) |
| return r; |
| } |
| |
| if (match == 1) |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| |
| /* Excluded subtrees: must not match any of these */ |
| |
| for (i = 0; i < sk_GENERAL_SUBTREE_num(nc->excludedSubtrees); i++) { |
| sub = sk_GENERAL_SUBTREE_value(nc->excludedSubtrees, i); |
| if (effective_type != sub->base->type) |
| continue; |
| if (!nc_minmax_valid(sub)) |
| return X509_V_ERR_SUBTREE_MINMAX; |
| |
| r = nc_match_single(gen, sub->base); |
| if (r == X509_V_OK) |
| return X509_V_ERR_EXCLUDED_VIOLATION; |
| else if (r != X509_V_ERR_PERMITTED_VIOLATION) |
| return r; |
| |
| } |
| |
| return X509_V_OK; |
| |
| } |
| |
| static int nc_match_single(GENERAL_NAME *gen, GENERAL_NAME *base) |
| { |
| switch (gen->type) { |
| case GEN_OTHERNAME: |
| /* |
| * We are here only when we have SmtpUTF8 name, |
| * so we match the value of othername with base->d.rfc822Name |
| */ |
| return nc_email_eai(gen->d.otherName->value, base->d.rfc822Name); |
| |
| case GEN_DIRNAME: |
| return nc_dn(gen->d.directoryName, base->d.directoryName); |
| |
| case GEN_DNS: |
| return nc_dns(gen->d.dNSName, base->d.dNSName); |
| |
| case GEN_EMAIL: |
| return nc_email(gen->d.rfc822Name, base->d.rfc822Name); |
| |
| case GEN_URI: |
| return nc_uri(gen->d.uniformResourceIdentifier, |
| base->d.uniformResourceIdentifier); |
| |
| case GEN_IPADD: |
| return nc_ip(gen->d.iPAddress, base->d.iPAddress); |
| |
| default: |
| return X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE; |
| } |
| |
| } |
| |
| /* |
| * directoryName name constraint matching. The canonical encoding of |
| * X509_NAME makes this comparison easy. It is matched if the subtree is a |
| * subset of the name. |
| */ |
| |
| static int nc_dn(const X509_NAME *nm, const X509_NAME *base) |
| { |
| /* Ensure canonical encodings are up to date. */ |
| if (nm->modified && i2d_X509_NAME(nm, NULL) < 0) |
| return X509_V_ERR_OUT_OF_MEM; |
| if (base->modified && i2d_X509_NAME(base, NULL) < 0) |
| return X509_V_ERR_OUT_OF_MEM; |
| if (base->canon_enclen > nm->canon_enclen) |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| if (memcmp(base->canon_enc, nm->canon_enc, base->canon_enclen)) |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| return X509_V_OK; |
| } |
| |
| static int nc_dns(ASN1_IA5STRING *dns, ASN1_IA5STRING *base) |
| { |
| char *baseptr = (char *)base->data; |
| char *dnsptr = (char *)dns->data; |
| |
| /* Empty matches everything */ |
| if (base->length == 0) |
| return X509_V_OK; |
| |
| if (dns->length < base->length) |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| |
| /* |
| * Otherwise can add zero or more components on the left so compare RHS |
| * and if dns is longer and expect '.' as preceding character. |
| */ |
| if (dns->length > base->length) { |
| dnsptr += dns->length - base->length; |
| if (*baseptr != '.' && dnsptr[-1] != '.') |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| } |
| |
| if (ia5ncasecmp(baseptr, dnsptr, base->length)) |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| |
| return X509_V_OK; |
| |
| } |
| |
| /* |
| * This function implements comparison between ASCII/U-label in emltype |
| * and A-label in base according to RFC 8398, section 6. |
| * Convert base to U-label and ASCII-parts of domain names, for base |
| * Octet-to-octet comparison of `emltype` and `base` hostname parts |
| * (ASCII-parts should be compared in case-insensitive manner) |
| */ |
| static int nc_email_eai(ASN1_TYPE *emltype, ASN1_IA5STRING *base) |
| { |
| ASN1_UTF8STRING *eml; |
| char *baseptr = NULL; |
| const char *emlptr; |
| const char *emlat; |
| char ulabel[256]; |
| size_t size = sizeof(ulabel) - 1; |
| int ret = X509_V_OK; |
| size_t emlhostlen; |
| |
| /* We do not accept embedded NUL characters */ |
| if (base->length > 0 && memchr(base->data, 0, base->length) != NULL) |
| return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX; |
| |
| /* 'base' may not be NUL terminated. Create a copy that is */ |
| baseptr = OPENSSL_strndup((char *)base->data, base->length); |
| if (baseptr == NULL) |
| return X509_V_ERR_OUT_OF_MEM; |
| |
| if (emltype->type != V_ASN1_UTF8STRING) { |
| ret = X509_V_ERR_UNSUPPORTED_NAME_SYNTAX; |
| goto end; |
| } |
| |
| eml = emltype->value.utf8string; |
| emlptr = (char *)eml->data; |
| emlat = ia5memrchr(eml, '@'); |
| |
| if (emlat == NULL) { |
| ret = X509_V_ERR_UNSUPPORTED_NAME_SYNTAX; |
| goto end; |
| } |
| |
| memset(ulabel, 0, sizeof(ulabel)); |
| /* Special case: initial '.' is RHS match */ |
| if (*baseptr == '.') { |
| ulabel[0] = '.'; |
| size -= 1; |
| if (ossl_a2ulabel(baseptr, ulabel + 1, &size) <= 0) { |
| ret = X509_V_ERR_UNSPECIFIED; |
| goto end; |
| } |
| |
| if ((size_t)eml->length > strlen(ulabel)) { |
| emlptr += eml->length - (strlen(ulabel)); |
| /* X509_V_OK */ |
| if (ia5ncasecmp(ulabel, emlptr, strlen(ulabel)) == 0) |
| goto end; |
| } |
| ret = X509_V_ERR_PERMITTED_VIOLATION; |
| goto end; |
| } |
| |
| if (ossl_a2ulabel(baseptr, ulabel, &size) <= 0) { |
| ret = X509_V_ERR_UNSPECIFIED; |
| goto end; |
| } |
| /* Just have hostname left to match: case insensitive */ |
| emlptr = emlat + 1; |
| emlhostlen = IA5_OFFSET_LEN(eml, emlptr); |
| if (emlhostlen != strlen(ulabel) |
| || ia5ncasecmp(ulabel, emlptr, emlhostlen) != 0) { |
| ret = X509_V_ERR_PERMITTED_VIOLATION; |
| goto end; |
| } |
| |
| end: |
| OPENSSL_free(baseptr); |
| return ret; |
| } |
| |
| static int nc_email(ASN1_IA5STRING *eml, ASN1_IA5STRING *base) |
| { |
| const char *baseptr = (char *)base->data; |
| const char *emlptr = (char *)eml->data; |
| const char *baseat = ia5memrchr(base, '@'); |
| const char *emlat = ia5memrchr(eml, '@'); |
| size_t basehostlen, emlhostlen; |
| |
| if (!emlat) |
| return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX; |
| /* Special case: initial '.' is RHS match */ |
| if (!baseat && base->length > 0 && (*baseptr == '.')) { |
| if (eml->length > base->length) { |
| emlptr += eml->length - base->length; |
| if (ia5ncasecmp(baseptr, emlptr, base->length) == 0) |
| return X509_V_OK; |
| } |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| } |
| |
| /* If we have anything before '@' match local part */ |
| |
| if (baseat) { |
| if (baseat != baseptr) { |
| if ((baseat - baseptr) != (emlat - emlptr)) |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| if (memchr(baseptr, 0, baseat - baseptr) || |
| memchr(emlptr, 0, emlat - emlptr)) |
| return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX; |
| /* Case sensitive match of local part */ |
| if (strncmp(baseptr, emlptr, emlat - emlptr)) |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| } |
| /* Position base after '@' */ |
| baseptr = baseat + 1; |
| } |
| emlptr = emlat + 1; |
| basehostlen = IA5_OFFSET_LEN(base, baseptr); |
| emlhostlen = IA5_OFFSET_LEN(eml, emlptr); |
| /* Just have hostname left to match: case insensitive */ |
| if (basehostlen != emlhostlen || ia5ncasecmp(baseptr, emlptr, emlhostlen)) |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| |
| return X509_V_OK; |
| |
| } |
| |
| static int nc_uri(ASN1_IA5STRING *uri, ASN1_IA5STRING *base) |
| { |
| const char *baseptr = (char *)base->data; |
| const char *hostptr = (char *)uri->data; |
| const char *p = ia5memchr(uri, (char *)uri->data, ':'); |
| int hostlen; |
| |
| /* Check for foo:// and skip past it */ |
| if (p == NULL |
| || IA5_OFFSET_LEN(uri, p) < 3 |
| || p[1] != '/' |
| || p[2] != '/') |
| return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX; |
| hostptr = p + 3; |
| |
| /* Determine length of hostname part of URI */ |
| |
| /* Look for a port indicator as end of hostname first */ |
| |
| p = ia5memchr(uri, hostptr, ':'); |
| /* Otherwise look for trailing slash */ |
| if (p == NULL) |
| p = ia5memchr(uri, hostptr, '/'); |
| |
| if (p == NULL) |
| hostlen = IA5_OFFSET_LEN(uri, hostptr); |
| else |
| hostlen = p - hostptr; |
| |
| if (hostlen == 0) |
| return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX; |
| |
| /* Special case: initial '.' is RHS match */ |
| if (base->length > 0 && *baseptr == '.') { |
| if (hostlen > base->length) { |
| p = hostptr + hostlen - base->length; |
| if (ia5ncasecmp(p, baseptr, base->length) == 0) |
| return X509_V_OK; |
| } |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| } |
| |
| if ((base->length != (int)hostlen) |
| || ia5ncasecmp(hostptr, baseptr, hostlen)) |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| |
| return X509_V_OK; |
| |
| } |
| |
| static int nc_ip(ASN1_OCTET_STRING *ip, ASN1_OCTET_STRING *base) |
| { |
| int hostlen, baselen, i; |
| unsigned char *hostptr, *baseptr, *maskptr; |
| hostptr = ip->data; |
| hostlen = ip->length; |
| baseptr = base->data; |
| baselen = base->length; |
| |
| /* Invalid if not IPv4 or IPv6 */ |
| if (!((hostlen == 4) || (hostlen == 16))) |
| return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX; |
| if (!((baselen == 8) || (baselen == 32))) |
| return X509_V_ERR_UNSUPPORTED_NAME_SYNTAX; |
| |
| /* Do not match IPv4 with IPv6 */ |
| if (hostlen * 2 != baselen) |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| |
| maskptr = base->data + hostlen; |
| |
| /* Considering possible not aligned base ipAddress */ |
| /* Not checking for wrong mask definition: i.e.: 255.0.255.0 */ |
| for (i = 0; i < hostlen; i++) |
| if ((hostptr[i] & maskptr[i]) != (baseptr[i] & maskptr[i])) |
| return X509_V_ERR_PERMITTED_VIOLATION; |
| |
| return X509_V_OK; |
| |
| } |
