1 /* $OpenBSD: x509_internal.h,v 1.3 2020/09/15 11:55:14 beck Exp $ */
3 * Copyright (c) 2020 Bob Beck <beck@openbsd.org>
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.
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.
17 #ifndef HEADER_X509_INTERNAL_H
18 #define HEADER_X509_INTERNAL_H
20 /* Internal use only, not public API */
21 #include <netinet/in.h>
23 #include <openssl/x509_verify.h>
25 /* Hard limits on structure size and number of signature checks. */
26 #define X509_VERIFY_MAX_CHAINS 8 /* Max validated chains */
27 #define X509_VERIFY_MAX_CHAIN_CERTS 32 /* Max depth of a chain */
28 #define X509_VERIFY_MAX_SIGCHECKS 256 /* Max signature checks */
31 * Limit the number of names and constraints we will check in a chain
32 * to avoid a hostile input DOS
34 #define X509_VERIFY_MAX_CHAIN_NAMES 512
35 #define X509_VERIFY_MAX_CHAIN_CONSTRAINTS 512
38 * Hold the parsed and validated result of names from a certificate.
39 * these typically come from a GENERALNAME, but we store the parsed
40 * and validated results, not the ASN1 bytes.
42 struct x509_constraints_name {
43 int type; /* GEN_* types from GENERAL_NAME */
44 char *name; /* Name to check */
45 char *local; /* holds the local part of GEN_EMAIL */
46 uint8_t *der; /* DER encoded value or NULL*/
48 int af; /* INET and INET6 are supported */
49 uint8_t address[32]; /* Must hold ipv6 + mask */
52 struct x509_constraints_names {
53 struct x509_constraints_name **names;
58 struct x509_verify_chain {
59 STACK_OF(X509) *certs; /* Kept in chain order, includes leaf */
60 struct x509_constraints_names *names; /* All names from all certs */
63 struct x509_verify_ctx {
65 struct x509_verify_chain **chains; /* Validated chains */
67 STACK_OF(X509) *roots; /* Trusted roots for this validation */
68 STACK_OF(X509) *intermediates; /* Intermediates provided by peer */
69 time_t *check_time; /* Time for validity checks */
70 int purpose; /* Cert purpose we are validating */
71 size_t max_chains; /* Max chains to return */
72 size_t max_depth; /* Max chain depth for validation */
73 size_t max_sigs; /* Max number of signature checks */
74 size_t sig_checks; /* Number of signature checks done */
75 size_t error_depth; /* Depth of last error seen */
76 int error; /* Last error seen */
79 int ASN1_time_tm_clamp_notafter(struct tm *tm);
83 int x509_vfy_check_id(X509_STORE_CTX *ctx);
84 int x509_vfy_check_revocation(X509_STORE_CTX *ctx);
85 int x509_vfy_check_policy(X509_STORE_CTX *ctx);
86 int x509_vfy_check_trust(X509_STORE_CTX *ctx);
87 int x509_vfy_check_chain_extensions(X509_STORE_CTX *ctx);
88 void x509v3_cache_extensions(X509 *x);
90 int x509_verify_asn1_time_to_tm(const ASN1_TIME *atime, struct tm *tm,
93 struct x509_verify_ctx *x509_verify_ctx_new_from_xsc(X509_STORE_CTX *xsc,
94 STACK_OF(X509) *roots);
96 void x509_constraints_name_clear(struct x509_constraints_name *name);
97 int x509_constraints_names_add(struct x509_constraints_names *names,
98 struct x509_constraints_name *name);
99 struct x509_constraints_names *x509_constraints_names_dup(
100 struct x509_constraints_names *names);
101 void x509_constraints_names_clear(struct x509_constraints_names *names);
102 struct x509_constraints_names *x509_constraints_names_new(void);
103 void x509_constraints_names_free(struct x509_constraints_names *names);
104 int x509_constraints_valid_host(uint8_t *name, size_t len);
105 int x509_constraints_valid_sandns(uint8_t *name, size_t len);
106 int x509_constraints_domain(char *domain, size_t dlen, char *constraint,
108 int x509_constraints_parse_mailbox(uint8_t *candidate, size_t len,
109 struct x509_constraints_name *name);
110 int x509_constraints_valid_domain_constraint(uint8_t *constraint,
112 int x509_constraints_uri_host(uint8_t *uri, size_t len, char **hostp);
113 int x509_constraints_uri(uint8_t *uri, size_t ulen, uint8_t *constraint,
114 size_t len, int *error);
115 int x509_constraints_extract_names(struct x509_constraints_names *names,
116 X509 *cert, int include_cn, int *error);
117 int x509_constraints_extract_constraints(X509 *cert,
118 struct x509_constraints_names *permitted,
119 struct x509_constraints_names *excluded, int *error);
120 int x509_constraints_check(struct x509_constraints_names *names,
121 struct x509_constraints_names *permitted,
122 struct x509_constraints_names *excluded, int *error);
123 int x509_constraints_chain(STACK_OF(X509) *chain, int *error,