1 /* $OpenBSD: x509_internal.h,v 1.23 2022/11/26 16:08:54 tb Exp $ */ 2 /* 3 * Copyright (c) 2020 Bob Beck <beck@openbsd.org> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 #ifndef HEADER_X509_INTERNAL_H 18 #define HEADER_X509_INTERNAL_H 19 20 /* Internal use only, not public API */ 21 #include <netinet/in.h> 22 23 #include <openssl/x509_verify.h> 24 25 #include "bytestring.h" 26 #include "x509_local.h" 27 28 /* Hard limits on structure size and number of signature checks. */ 29 #define X509_VERIFY_MAX_CHAINS 8 /* Max validated chains */ 30 #define X509_VERIFY_MAX_CHAIN_CERTS 32 /* Max depth of a chain */ 31 #define X509_VERIFY_MAX_SIGCHECKS 256 /* Max signature checks */ 32 33 /* 34 * Limit the number of names and constraints we will check in a chain 35 * to avoid a hostile input DOS 36 */ 37 #define X509_VERIFY_MAX_CHAIN_NAMES 512 38 #define X509_VERIFY_MAX_CHAIN_CONSTRAINTS 512 39 40 /* 41 * Hold the parsed and validated result of names from a certificate. 42 * these typically come from a GENERALNAME, but we store the parsed 43 * and validated results, not the ASN1 bytes. 44 */ 45 struct x509_constraints_name { 46 int type; /* GEN_* types from GENERAL_NAME */ 47 char *name; /* Name to check */ 48 char *local; /* holds the local part of GEN_EMAIL */ 49 uint8_t *der; /* DER encoded value or NULL*/ 50 size_t der_len; 51 int af; /* INET and INET6 are supported */ 52 uint8_t address[32]; /* Must hold ipv6 + mask */ 53 }; 54 55 struct x509_constraints_names { 56 struct x509_constraints_name **names; 57 size_t names_count; 58 size_t names_len; 59 size_t names_max; 60 }; 61 62 struct x509_verify_chain { 63 STACK_OF(X509) *certs; /* Kept in chain order, includes leaf */ 64 int *cert_errors; /* Verify error for each cert in chain. */ 65 struct x509_constraints_names *names; /* All names from all certs */ 66 }; 67 68 struct x509_verify_ctx { 69 X509_STORE_CTX *xsc; 70 struct x509_verify_chain **chains; /* Validated chains */ 71 STACK_OF(X509) *saved_error_chain; 72 int saved_error; 73 int saved_error_depth; 74 size_t chains_count; 75 STACK_OF(X509) *roots; /* Trusted roots for this validation */ 76 STACK_OF(X509) *intermediates; /* Intermediates provided by peer */ 77 time_t *check_time; /* Time for validity checks */ 78 int purpose; /* Cert purpose we are validating */ 79 size_t max_chains; /* Max chains to return */ 80 size_t max_depth; /* Max chain depth for validation */ 81 size_t max_sigs; /* Max number of signature checks */ 82 size_t sig_checks; /* Number of signature checks done */ 83 size_t error_depth; /* Depth of last error seen */ 84 int error; /* Last error seen */ 85 }; 86 87 int ASN1_time_tm_clamp_notafter(struct tm *tm); 88 89 __BEGIN_HIDDEN_DECLS 90 91 int x509_vfy_check_id(X509_STORE_CTX *ctx); 92 int x509_vfy_check_revocation(X509_STORE_CTX *ctx); 93 int x509_vfy_check_policy(X509_STORE_CTX *ctx); 94 int x509_vfy_check_trust(X509_STORE_CTX *ctx); 95 int x509_vfy_check_chain_extensions(X509_STORE_CTX *ctx); 96 int x509_vfy_callback_indicate_completion(X509_STORE_CTX *ctx); 97 void x509v3_cache_extensions(X509 *x); 98 X509 *x509_vfy_lookup_cert_match(X509_STORE_CTX *ctx, X509 *x); 99 100 time_t x509_verify_asn1_time_to_time_t(const ASN1_TIME *atime, int notafter); 101 102 struct x509_verify_ctx *x509_verify_ctx_new_from_xsc(X509_STORE_CTX *xsc); 103 104 void x509_constraints_name_clear(struct x509_constraints_name *name); 105 void x509_constraints_name_free(struct x509_constraints_name *name); 106 int x509_constraints_names_add(struct x509_constraints_names *names, 107 struct x509_constraints_name *name); 108 struct x509_constraints_names *x509_constraints_names_dup( 109 struct x509_constraints_names *names); 110 void x509_constraints_names_clear(struct x509_constraints_names *names); 111 struct x509_constraints_names *x509_constraints_names_new(size_t names_max); 112 int x509_constraints_general_to_bytes(GENERAL_NAME *name, uint8_t **bytes, 113 size_t *len); 114 void x509_constraints_names_free(struct x509_constraints_names *names); 115 int x509_constraints_valid_host(CBS *cbs); 116 int x509_constraints_valid_sandns(CBS *cbs); 117 int x509_constraints_domain(char *domain, size_t dlen, char *constraint, 118 size_t len); 119 int x509_constraints_parse_mailbox(CBS *candidate, 120 struct x509_constraints_name *name); 121 int x509_constraints_valid_domain_constraint(CBS *cbs); 122 int x509_constraints_uri_host(uint8_t *uri, size_t len, char **hostp); 123 int x509_constraints_uri(uint8_t *uri, size_t ulen, uint8_t *constraint, 124 size_t len, int *error); 125 int x509_constraints_extract_names(struct x509_constraints_names *names, 126 X509 *cert, int include_cn, int *error); 127 int x509_constraints_extract_constraints(X509 *cert, 128 struct x509_constraints_names *permitted, 129 struct x509_constraints_names *excluded, int *error); 130 int x509_constraints_validate(GENERAL_NAME *constraint, 131 struct x509_constraints_name **out_name, int *error); 132 int x509_constraints_check(struct x509_constraints_names *names, 133 struct x509_constraints_names *permitted, 134 struct x509_constraints_names *excluded, int *error); 135 int x509_constraints_chain(STACK_OF(X509) *chain, int *error, 136 int *depth); 137 void x509_verify_cert_info_populate(X509 *cert); 138 int x509_vfy_check_security_level(X509_STORE_CTX *ctx); 139 140 __END_HIDDEN_DECLS 141 142 #endif 143