1X509_VERIFY_PARAM_SET_FLAGS(3) OpenSSL X509_VERIFY_PARAM_SET_FLAGS(3)
2
6 X509_VERIFY_PARAM_set_flags, X509_VERIFY_PARAM_clear_flags,
7 X509_VERIFY_PARAM_get_flags, X509_VERIFY_PARAM_set_purpose,
8 X509_VERIFY_PARAM_get_inh_flags, X509_VERIFY_PARAM_set_inh_flags,
9 X509_VERIFY_PARAM_set_trust, X509_VERIFY_PARAM_set_depth,
10 X509_VERIFY_PARAM_get_depth, X509_VERIFY_PARAM_set_auth_level,
11 X509_VERIFY_PARAM_get_auth_level, X509_VERIFY_PARAM_set_time,
12 X509_VERIFY_PARAM_get_time, X509_VERIFY_PARAM_add0_policy,
13 X509_VERIFY_PARAM_set1_policies, X509_VERIFY_PARAM_set1_host,
14 X509_VERIFY_PARAM_add1_host, X509_VERIFY_PARAM_set_hostflags,
15 X509_VERIFY_PARAM_get_hostflags, X509_VERIFY_PARAM_get0_peername,
16 X509_VERIFY_PARAM_set1_email, X509_VERIFY_PARAM_set1_ip,
17 X509_VERIFY_PARAM_set1_ip_asc - X509 verification parameters
18
20 #include <openssl/x509_vfy.h>
21 int X509_VERIFY_PARAM_set_flags(X509_VERIFY_PARAM *param,
23 unsigned long flags);
24 int X509_VERIFY_PARAM_clear_flags(X509_VERIFY_PARAM *param,
25 unsigned long flags);
26 unsigned long X509_VERIFY_PARAM_get_flags(X509_VERIFY_PARAM *param);
27 int X509_VERIFY_PARAM_set_inh_flags(X509_VERIFY_PARAM *param,
29 uint32_t flags);
30 uint32_t X509_VERIFY_PARAM_get_inh_flags(const X509_VERIFY_PARAM *param);
31 int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose);
33 int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust);
34 void X509_VERIFY_PARAM_set_time(X509_VERIFY_PARAM *param, time_t t);
36 time_t X509_VERIFY_PARAM_get_time(const X509_VERIFY_PARAM *param);
37 int X509_VERIFY_PARAM_add0_policy(X509_VERIFY_PARAM *param,
39 ASN1_OBJECT *policy);
40 int X509_VERIFY_PARAM_set1_policies(X509_VERIFY_PARAM *param,
41 STACK_OF(ASN1_OBJECT) *policies);
42 void X509_VERIFY_PARAM_set_depth(X509_VERIFY_PARAM *param, int depth);
44 int X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param);
45 void X509_VERIFY_PARAM_set_auth_level(X509_VERIFY_PARAM *param,
47 int auth_level);
48 int X509_VERIFY_PARAM_get_auth_level(const X509_VERIFY_PARAM *param);
49 int X509_VERIFY_PARAM_set1_host(X509_VERIFY_PARAM *param,
51 const char *name, size_t namelen);
52 int X509_VERIFY_PARAM_add1_host(X509_VERIFY_PARAM *param,
53 const char *name, size_t namelen);
54 void X509_VERIFY_PARAM_set_hostflags(X509_VERIFY_PARAM *param,
55 unsigned int flags);
56 unsigned int X509_VERIFY_PARAM_get_hostflags(const X509_VERIFY_PARAM *param);
57 char *X509_VERIFY_PARAM_get0_peername(X509_VERIFY_PARAM *param);
58 int X509_VERIFY_PARAM_set1_email(X509_VERIFY_PARAM *param,
59 const char *email, size_t emaillen);
60 int X509_VERIFY_PARAM_set1_ip(X509_VERIFY_PARAM *param,
61 const unsigned char *ip, size_t iplen);
62 int X509_VERIFY_PARAM_set1_ip_asc(X509_VERIFY_PARAM *param, const char *ipasc);
63
65 These functions manipulate the X509_VERIFY_PARAM structure associated
66 with a certificate verification operation.
67 The X509_VERIFY_PARAM_set_flags() function sets the flags in param by
69 oring it with flags. See the VERIFICATION FLAGS section for a complete
70 description of values the flags parameter can take.
71 X509_VERIFY_PARAM_get_flags() returns the flags in param.
73 X509_VERIFY_PARAM_get_inh_flags() returns the inheritance flags in
75 param which specifies how verification flags are copied from one
76 structure to another. X509_VERIFY_PARAM_set_inh_flags() sets the
77 inheritance flags. See the INHERITANCE FLAGS section for a description
78 of these bits.
79 X509_VERIFY_PARAM_clear_flags() clears the flags flags in param.
81 X509_VERIFY_PARAM_set_purpose() sets the verification purpose in param
83 to purpose. This determines the acceptable purpose of the certificate
84 chain, for example SSL client or SSL server.
85 X509_VERIFY_PARAM_set_trust() sets the trust setting in param to trust.
87 X509_VERIFY_PARAM_set_time() sets the verification time in param to t.
89 Normally the current time is used.
90 X509_VERIFY_PARAM_add0_policy() enables policy checking (it is disabled
92 by default) and adds policy to the acceptable policy set.
93 X509_VERIFY_PARAM_set1_policies() enables policy checking (it is
95 disabled by default) and sets the acceptable policy set to policies.
96 Any existing policy set is cleared. The policies parameter can be NULL
97 to clear an existing policy set.
98 X509_VERIFY_PARAM_set_depth() sets the maximum verification depth to
100 depth. That is the maximum number of intermediate CA certificates that
101 can appear in a chain. A maximal depth chain contains 2 more
102 certificates than the limit, since neither the end-entity certificate
103 nor the trust-anchor count against this limit. Thus a depth limit of 0
104 only allows the end-entity certificate to be signed directly by the
105 trust-anchor, while with a depth limit of 1 there can be one
106 intermediate CA certificate between the trust-anchor and the end-entity
107 certificate.
108 X509_VERIFY_PARAM_set_auth_level() sets the authentication security
110 level to auth_level. The authentication security level determines the
111 acceptable signature and public key strength when verifying certificate
112 chains. For a certificate chain to validate, the public keys of all
113 the certificates must meet the specified security level. The signature
114 algorithm security level is not enforced for the chain's trust anchor
115 certificate, which is either directly trusted or validated by means
116 other than its signature. See SSL_CTX_set_security_level(3) for the
117 definitions of the available levels. The default security level is -1,
118 or "not set". At security level 0 or lower all algorithms are
119 acceptable. Security level 1 requires at least 80-bit-equivalent
120 security and is broadly interoperable, though it will, for example,
121 reject MD5 signatures or RSA keys shorter than 1024 bits.
122 X509_VERIFY_PARAM_set1_host() sets the expected DNS hostname to name
124 clearing any previously specified hostname or names. If name is NULL,
125 or empty the list of hostnames is cleared, and name checks are not
126 performed on the peer certificate. If name is NUL-terminated, namelen
127 may be zero, otherwise namelen must be set to the length of name.
128 When a hostname is specified, certificate verification automatically
130 invokes X509_check_host(3) with flags equal to the flags argument given
131 to X509_VERIFY_PARAM_set_hostflags() (default zero). Applications are
132 strongly advised to use this interface in preference to explicitly
133 calling X509_check_host(3), hostname checks may be out of scope with
134 the DANE-EE(3) certificate usage, and the internal check will be
135 suppressed as appropriate when DANE verification is enabled.
136 When the subject CommonName will not be ignored, whether as a result of
138 the X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT host flag, or because no DNS
139 subject alternative names are present in the certificate, any DNS name
140 constraints in issuer certificates apply to the subject CommonName as
141 well as the subject alternative name extension.
142 When the subject CommonName will be ignored, whether as a result of the
144 X509_CHECK_FLAG_NEVER_CHECK_SUBJECT host flag, or because some DNS
145 subject alternative names are present in the certificate, DNS name
146 constraints in issuer certificates will not be applied to the subject
147 DN. As described in X509_check_host(3) the
148 X509_CHECK_FLAG_NEVER_CHECK_SUBJECT flag takes precedence over the
149 X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT flag.
150 X509_VERIFY_PARAM_get_hostflags() returns any host flags previously set
152 via a call to X509_VERIFY_PARAM_set_hostflags().
153 X509_VERIFY_PARAM_add1_host() adds name as an additional reference
155 identifier that can match the peer's certificate. Any previous names
156 set via X509_VERIFY_PARAM_set1_host() or X509_VERIFY_PARAM_add1_host()
157 are retained, no change is made if name is NULL or empty. When
158 multiple names are configured, the peer is considered verified when any
159 name matches.
160 X509_VERIFY_PARAM_get0_peername() returns the DNS hostname or subject
162 CommonName from the peer certificate that matched one of the reference
163 identifiers. When wildcard matching is not disabled, or when a
164 reference identifier specifies a parent domain (starts with ".")
165 rather than a hostname, the peer name may be a wildcard name or a sub-
166 domain of the reference identifier respectively. The return string is
167 allocated by the library and is no longer valid once the associated
168 param argument is freed. Applications must not free the return value.
169 X509_VERIFY_PARAM_set1_email() sets the expected RFC822 email address
171 to email. If email is NUL-terminated, emaillen may be zero, otherwise
172 emaillen must be set to the length of email. When an email address is
173 specified, certificate verification automatically invokes
174 X509_check_email(3).
175 X509_VERIFY_PARAM_set1_ip() sets the expected IP address to ip. The ip
177 argument is in binary format, in network byte-order and iplen must be
178 set to 4 for IPv4 and 16 for IPv6. When an IP address is specified,
179 certificate verification automatically invokes X509_check_ip(3).
180 X509_VERIFY_PARAM_set1_ip_asc() sets the expected IP address to ipasc.
182 The ipasc argument is a NUL-terminal ASCII string: dotted decimal quad
183 for IPv4 and colon-separated hexadecimal for IPv6. The condensed "::"
184 notation is supported for IPv6 addresses.
185
187 X509_VERIFY_PARAM_set_flags(), X509_VERIFY_PARAM_clear_flags(),
188 X509_VERIFY_PARAM_set_inh_flags(), X509_VERIFY_PARAM_set_purpose(),
189 X509_VERIFY_PARAM_set_trust(), X509_VERIFY_PARAM_add0_policy()
190 X509_VERIFY_PARAM_set1_policies(), X509_VERIFY_PARAM_set1_host(),
191 X509_VERIFY_PARAM_add1_host(), X509_VERIFY_PARAM_set1_email(),
192 X509_VERIFY_PARAM_set1_ip() and X509_VERIFY_PARAM_set1_ip_asc() return
193 1 for success and 0 for failure.
194 X509_VERIFY_PARAM_get_flags() returns the current verification flags.
196 X509_VERIFY_PARAM_get_hostflags() returns any current host flags.
198 X509_VERIFY_PARAM_get_inh_flags() returns the current inheritance
200 flags.
201 X509_VERIFY_PARAM_set_time() and X509_VERIFY_PARAM_set_depth() do not
203 return values.
204 X509_VERIFY_PARAM_get_depth() returns the current verification depth.
206 X509_VERIFY_PARAM_get_auth_level() returns the current authentication
208 security level.
209
211 The verification flags consists of zero or more of the following flags
212 ored together.
213 X509_V_FLAG_CRL_CHECK enables CRL checking for the certificate chain
215 leaf certificate. An error occurs if a suitable CRL cannot be found.
216 X509_V_FLAG_CRL_CHECK_ALL enables CRL checking for the entire
218 certificate chain.
219 X509_V_FLAG_IGNORE_CRITICAL disabled critical extension checking. By
221 default any unhandled critical extensions in certificates or (if
222 checked) CRLs results in a fatal error. If this flag is set unhandled
223 critical extensions are ignored. WARNING setting this option for
224 anything other than debugging purposes can be a security risk. Finer
225 control over which extensions are supported can be performed in the
226 verification callback.
227 The X509_V_FLAG_X509_STRICT flag disables workarounds for some broken
229 certificates and makes the verification strictly apply X509 rules.
230 X509_V_FLAG_ALLOW_PROXY_CERTS enables proxy certificate verification.
232 X509_V_FLAG_POLICY_CHECK enables certificate policy checking, by
234 default no policy checking is performed. Additional information is sent
235 to the verification callback relating to policy checking.
236 X509_V_FLAG_EXPLICIT_POLICY, X509_V_FLAG_INHIBIT_ANY and
238 X509_V_FLAG_INHIBIT_MAP set the require explicit policy, inhibit any
239 policy and inhibit policy mapping flags respectively as defined in
240 RFC3280. Policy checking is automatically enabled if any of these flags
241 are set.
242 If X509_V_FLAG_NOTIFY_POLICY is set and the policy checking is
244 successful a special status code is set to the verification callback.
245 This permits it to examine the valid policy tree and perform additional
246 checks or simply log it for debugging purposes.
247 By default some additional features such as indirect CRLs and CRLs
249 signed by different keys are disabled. If
250 X509_V_FLAG_EXTENDED_CRL_SUPPORT is set they are enabled.
251 If X509_V_FLAG_USE_DELTAS is set delta CRLs (if present) are used to
253 determine certificate status. If not set deltas are ignored.
254 X509_V_FLAG_CHECK_SS_SIGNATURE requests checking the signature of the
256 last certificate in a chain if the certificate is supposedly self-
257 signed. This is prohibited and will result in an error if it is a non-
258 conforming CA certificate with key usage restrictions not including the
259 keyCertSign bit. By default this check is disabled because it doesn't
260 add any additional security but in some cases applications might want
261 to check the signature anyway. A side effect of not checking the self-
262 signature of such a certificate is that disabled or unsupported message
263 digests used for the signature are not treated as fatal errors.
264 When X509_V_FLAG_TRUSTED_FIRST is set, construction of the certificate
266 chain in X509_verify_cert(3) will search the trust store for issuer
267 certificates before searching the provided untrusted certificates.
268 Local issuer certificates are often more likely to satisfy local
269 security requirements and lead to a locally trusted root. This is
270 especially important when some certificates in the trust store have
271 explicit trust settings (see "TRUST SETTINGS" in x509(1)). As of
272 OpenSSL 1.1.0 this option is on by default.
273 The X509_V_FLAG_NO_ALT_CHAINS flag suppresses checking for alternative
275 chains. By default, unless X509_V_FLAG_TRUSTED_FIRST is set, when
276 building a certificate chain, if the first certificate chain found is
277 not trusted, then OpenSSL will attempt to replace untrusted
278 certificates supplied by the peer with certificates from the trust
279 store to see if an alternative chain can be found that is trusted. As
280 of OpenSSL 1.1.0, with X509_V_FLAG_TRUSTED_FIRST always set, this
281 option has no effect.
282 The X509_V_FLAG_PARTIAL_CHAIN flag causes intermediate certificates in
284 the trust store to be treated as trust-anchors, in the same way as the
285 self-signed root CA certificates. This makes it possible to trust
286 certificates issued by an intermediate CA without having to trust its
287 ancestor root CA. With OpenSSL 1.1.0 and later and
288 <X509_V_FLAG_PARTIAL_CHAIN> set, chain construction stops as soon as
289 the first certificate from the trust store is added to the chain,
290 whether that certificate is a self-signed "root" certificate or a not
291 self-signed intermediate certificate. Thus, when an intermediate
292 certificate is found in the trust store, the verified chain passed to
293 callbacks may be shorter than it otherwise would be without the
294 X509_V_FLAG_PARTIAL_CHAIN flag.
295 The X509_V_FLAG_NO_CHECK_TIME flag suppresses checking the validity
297 period of certificates and CRLs against the current time. If
298 X509_VERIFY_PARAM_set_time() is used to specify a verification time,
299 the check is not suppressed.
300
302 These flags specify how parameters are "inherited" from one structure
303 to another.
304 If X509_VP_FLAG_ONCE is set then the current setting is zeroed after
306 the next call.
307 If X509_VP_FLAG_LOCKED is set then no values are copied. This
309 overrides all of the following flags.
310 If X509_VP_FLAG_DEFAULT is set then anything set in the source is
312 copied to the destination. Effectively the values in "to" become
313 default values which will be used only if nothing new is set in "from".
314 This is the default.
315 If X509_VP_FLAG_OVERWRITE is set then all value are copied across
317 whether they are set or not. Flags is still Ored though.
318 If X509_VP_FLAG_RESET_FLAGS is set then the flags value is copied
320 instead of ORed.
321
323 The above functions should be used to manipulate verification
324 parameters instead of functions which work in specific structures such
325 as X509_STORE_CTX_set_flags() which are likely to be deprecated in a
326 future release.
327
329 Delta CRL checking is currently primitive. Only a single delta can be
330 used and (partly due to limitations of X509_STORE) constructed CRLs are
331 not maintained.
332 If CRLs checking is enable CRLs are expected to be available in the
334 corresponding X509_STORE structure. No attempt is made to download CRLs
335 from the CRL distribution points extension.
336
338 Enable CRL checking when performing certificate verification during SSL
339 connections associated with an SSL_CTX structure ctx:
340 X509_VERIFY_PARAM *param;
342 param = X509_VERIFY_PARAM_new();
344 X509_VERIFY_PARAM_set_flags(param, X509_V_FLAG_CRL_CHECK);
345 SSL_CTX_set1_param(ctx, param);
346 X509_VERIFY_PARAM_free(param);
347
349 X509_verify_cert(3), X509_check_host(3), X509_check_email(3),
350 X509_check_ip(3), x509(1)
351
353 The X509_V_FLAG_NO_ALT_CHAINS flag was added in OpenSSL 1.1.0. The
354 flag X509_V_FLAG_CB_ISSUER_CHECK was deprecated in OpenSSL 1.1.0 and
355 has no effect.
356 The X509_VERIFY_PARAM_get_hostflags() function was added in OpenSSL
358 1.1.0i.
359
361 Copyright 2009-2020 The OpenSSL Project Authors. All Rights Reserved.
362 Licensed under the OpenSSL license (the "License"). You may not use
364 this file except in compliance with the License. You can obtain a copy
365 in the file LICENSE in the source distribution or at
366 <https://www.openssl.org/source/license.html>.
3671.1.1i 2021-07-22 X509_VERIFY_PARAM_SET_FLAGS(3)