5 X509_STORE_CTX_get_error, X509_STORE_CTX_set_error,
6 X509_STORE_CTX_get_error_depth, X509_STORE_CTX_set_error_depth,
7 X509_STORE_CTX_get_current_cert, X509_STORE_CTX_set_current_cert,
8 X509_STORE_CTX_get0_cert, X509_STORE_CTX_get1_chain,
9 X509_verify_cert_error_string - get or set certificate verification status
14 #include <openssl/x509.h>
16 int X509_STORE_CTX_get_error(const X509_STORE_CTX *ctx);
17 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int s);
18 int X509_STORE_CTX_get_error_depth(const X509_STORE_CTX *ctx);
19 void X509_STORE_CTX_set_error_depth(X509_STORE_CTX *ctx, int depth);
20 X509 *X509_STORE_CTX_get_current_cert(const X509_STORE_CTX *ctx);
21 void X509_STORE_CTX_set_current_cert(X509_STORE_CTX *ctx, X509 *x);
22 X509 *X509_STORE_CTX_get0_cert(const X509_STORE_CTX *ctx);
24 STACK_OF(X509) *X509_STORE_CTX_get1_chain(const X509_STORE_CTX *ctx);
26 const char *X509_verify_cert_error_string(long n);
30 These functions are typically called after X509_verify_cert() has indicated
31 an error or in a verification callback to determine the nature of an error.
33 X509_STORE_CTX_get_error() returns the error code of B<ctx>, see
34 the B<ERROR CODES> section for a full description of all error codes.
36 X509_STORE_CTX_set_error() sets the error code of B<ctx> to B<s>. For example
37 it might be used in a verification callback to set an error based on additional
40 X509_STORE_CTX_get_error_depth() returns the B<depth> of the error. This is a
41 nonnegative integer representing where in the certificate chain the error
42 occurred. If it is zero it occurred in the end entity certificate, one if
43 it is the certificate which signed the end entity certificate and so on.
45 X509_STORE_CTX_set_error_depth() sets the error B<depth>.
46 This can be used in combination with X509_STORE_CTX_set_error() to set the
47 depth at which an error condition was detected.
49 X509_STORE_CTX_get_current_cert() returns the certificate in B<ctx> which
50 caused the error or B<NULL> if no certificate is relevant.
52 X509_STORE_CTX_set_current_cert() sets the certificate B<x> in B<ctx> which
54 This value is not intended to remain valid for very long, and remains owned by
56 It may be examined by a verification callback invoked to handle each error
57 encountered during chain verification and is no longer required after such a
59 If a callback wishes the save the certificate for use after it returns, it
60 needs to increment its reference count via L<X509_up_ref(3)>.
61 Once such a I<saved> certificate is no longer needed it can be freed with
64 X509_STORE_CTX_get0_cert() retrieves an internal pointer to the
65 certificate being verified by the B<ctx>.
67 X509_STORE_CTX_get1_chain() returns a complete validate chain if a previous
68 call to X509_verify_cert() is successful. If the call to X509_verify_cert()
69 is B<not> successful the returned chain may be incomplete or invalid. The
70 returned chain persists after the B<ctx> structure is freed, when it is
71 no longer needed it should be free up using:
73 sk_X509_pop_free(chain, X509_free);
75 X509_verify_cert_error_string() returns a human readable error string for
76 verification error B<n>.
80 X509_STORE_CTX_get_error() returns B<X509_V_OK> or an error code.
82 X509_STORE_CTX_get_error_depth() returns a nonnegative error depth.
84 X509_STORE_CTX_get_current_cert() returns the certificate which caused the
85 error or B<NULL> if no certificate is relevant to the error.
87 X509_verify_cert_error_string() returns a human readable error string for
88 verification error B<n>.
92 A list of error codes and messages is shown below. Some of the
93 error codes are defined but currently never returned: these are described as
98 =item B<X509_V_OK: ok>
100 The operation was successful.
102 =item B<X509_V_ERR_UNSPECIFIED: unspecified certificate verification error>
104 Unspecified error; should not happen.
106 =item B<X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get issuer certificate>
108 The issuer certificate of a locally looked up certificate could not be found.
109 This normally means the list of trusted certificates is not complete.
110 To allow any certificate (not only a self-signed one) in the trust store
111 to terminate the chain the B<X509_V_FLAG_PARTIAL_CHAIN> flag may be set.
113 =item B<X509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate CRL>
115 The CRL of a certificate could not be found.
117 =item B<X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
118 unable to decrypt certificate's signature>
120 The certificate signature could not be decrypted. This means that the actual
121 signature value could not be determined rather than it not matching the
122 expected value, this is only meaningful for RSA keys.
124 =item B<X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
125 unable to decrypt CRL's signature>
127 The CRL signature could not be decrypted: this means that the actual signature
128 value could not be determined rather than it not matching the expected value.
131 =item B<X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
132 unable to decode issuer public key>
134 The public key in the certificate C<SubjectPublicKeyInfo> field could
137 =item B<X509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure>
139 The signature of the certificate is invalid.
141 =item B<X509_V_ERR_CRL_SIGNATURE_FAILURE: CRL signature failure>
143 The signature of the certificate is invalid.
145 =item B<X509_V_ERR_CERT_NOT_YET_VALID: certificate is not yet valid>
147 The certificate is not yet valid: the C<notBefore> date is after the
150 =item B<X509_V_ERR_CERT_HAS_EXPIRED: certificate has expired>
152 The certificate has expired: that is the C<notAfter> date is before the
155 =item B<X509_V_ERR_CRL_NOT_YET_VALID: CRL is not yet valid>
157 The CRL is not yet valid.
159 =item B<X509_V_ERR_CRL_HAS_EXPIRED: CRL has expired>
163 =item B<X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
164 format error in certificate's notBefore field>
166 The certificate B<notBefore> field contains an invalid time.
168 =item B<X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
169 format error in certificate's notAfter field>
171 The certificate B<notAfter> field contains an invalid time.
173 =item B<X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
174 format error in CRL's lastUpdate field>
176 The CRL B<lastUpdate> field contains an invalid time.
178 =item B<X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
179 format error in CRL's nextUpdate field>
181 The CRL B<nextUpdate> field contains an invalid time.
183 =item B<X509_V_ERR_OUT_OF_MEM: out of memory>
185 An error occurred trying to allocate memory.
187 =item B<X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: self-signed certificate>
189 The passed certificate is self-signed and the same certificate cannot be found
190 in the list of trusted certificates.
192 =item B<X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
193 self-signed certificate in certificate chain>
195 The certificate chain could be built up using the untrusted certificates
196 but no suitable trust anchor (which typically is a self-signed root certificate)
197 could be found in the trust store.
199 =item B<X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
200 unable to get local issuer certificate>
202 The issuer certificate could not be found: this occurs if the issuer certificate
203 of an untrusted certificate cannot be found.
205 =item B<X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
206 unable to verify the first certificate>
208 No signatures could be verified because the chain contains only one certificate
209 and it is not self-signed and the B<X509_V_FLAG_PARTIAL_CHAIN> flag is not set.
211 =item B<X509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long>
213 The certificate chain length is greater than the supplied maximum depth. Unused.
215 =item B<X509_V_ERR_CERT_REVOKED: certificate revoked>
217 The certificate has been revoked.
219 =item B<X509_V_ERR_INVALID_CA: invalid CA certificate>
221 A CA certificate is invalid. Either it is not a CA or its extensions are not
222 consistent with the supplied purpose.
224 =item B<X509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded>
226 The basicConstraints path-length parameter has been exceeded.
228 =item B<X509_V_ERR_INVALID_PURPOSE: unsupported certificate purpose>
230 The target certificate cannot be used for the specified purpose.
232 =item B<X509_V_ERR_CERT_UNTRUSTED: certificate not trusted>
234 The root CA is not marked as trusted for the specified purpose.
236 =item B<X509_V_ERR_CERT_REJECTED: certificate rejected>
238 The root CA is marked to reject the specified purpose.
240 =item B<X509_V_ERR_SUBJECT_ISSUER_MISMATCH: subject issuer mismatch>
242 The current candidate issuer certificate was rejected because its subject name
243 did not match the issuer name of the current certificate.
245 =item B<X509_V_ERR_AKID_SKID_MISMATCH:
246 authority and subject key identifier mismatch>
248 The current candidate issuer certificate was rejected because its subject key
249 identifier was present and did not match the authority key identifier current
251 Not used as of OpenSSL 1.1.0.
253 =item B<X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH:
254 authority and issuer serial number mismatch>
256 The current candidate issuer certificate was rejected because its issuer name
257 and serial number was present and did not match the authority key identifier of
258 the current certificate.
259 Not used as of OpenSSL 1.1.0.
261 =item B<X509_V_ERR_KEYUSAGE_NO_CERTSIGN:
262 key usage does not include certificate signing>
264 The current candidate issuer certificate was rejected because its B<keyUsage>
265 extension does not permit certificate signing.
266 Not used as of OpenSSL 1.1.0.
268 =item B<X509_V_ERR_INVALID_EXTENSION:
269 invalid or inconsistent certificate extension>
271 A certificate extension had an invalid value (for example an incorrect
272 encoding) or some value inconsistent with other extensions.
274 =item B<X509_V_ERR_INVALID_POLICY_EXTENSION:
275 invalid or inconsistent certificate policy extension>
277 A certificate policies extension had an invalid value (for example an incorrect
278 encoding) or some value inconsistent with other extensions. This error only
279 occurs if policy processing is enabled.
281 =item B<X509_V_ERR_NO_EXPLICIT_POLICY: no explicit policy>
283 The verification flags were set to require and explicit policy but none was
286 =item B<X509_V_ERR_DIFFERENT_CRL_SCOPE: different CRL scope>
288 The only CRLs that could be found did not match the scope of the certificate.
290 =item B<X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE: Unsupported extension feature>
292 Some feature of a certificate extension is not supported. Unused.
294 =item B<X509_V_ERR_PERMITTED_VIOLATION: permitted subtree violation>
296 A name constraint violation occurred in the permitted subtrees.
298 =item B<X509_V_ERR_EXCLUDED_VIOLATION: excluded subtree violation>
300 A name constraint violation occurred in the excluded subtrees.
302 =item B<X509_V_ERR_SUBTREE_MINMAX:
303 name constraints minimum and maximum not supported>
305 A certificate name constraints extension included a minimum or maximum field:
306 this is not supported.
308 =item B<X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE:
309 unsupported name constraint type>
311 An unsupported name constraint type was encountered. OpenSSL currently only
312 supports directory name, DNS name, email and URI types.
314 =item B<X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX:
315 unsupported or invalid name constraint syntax>
317 The format of the name constraint is not recognised: for example an email
318 address format of a form not mentioned in RFC3280. This could be caused by
319 a garbage extension or some new feature not currently supported.
321 =item B<X509_V_ERR_CRL_PATH_VALIDATION_ERROR: CRL path validation error>
323 An error occurred when attempting to verify the CRL path. This error can only
324 happen if extended CRL checking is enabled.
326 =item B<X509_V_ERR_APPLICATION_VERIFICATION: application verification failure>
328 An application specific error. This will never be returned unless explicitly
329 set by an application callback.
331 =item B<X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER: unable to get CRL issuer certificate>
333 Unable to get CRL issuer certificate.
335 =item B<X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION: unhandled critical extension>
337 Unhandled critical extension.
339 =item B<X509_V_ERR_KEYUSAGE_NO_CRL_SIGN: key usage does not include CRL signing>
341 Key usage does not include CRL signing.
343 =item B<X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION: unhandled critical CRL extension>
345 Unhandled critical CRL extension.
347 =item B<X509_V_ERR_INVALID_NON_CA: invalid non-CA certificate (has CA markings)>
349 Invalid non-CA certificate has CA markings.
351 =item B<X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED: proxy path length constraint exceeded>
353 Proxy path length constraint exceeded.
355 =item B<X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE: key usage does not include digital signature>
357 Key usage does not include digital signature, and therefore cannot sign
360 =item B<X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED: proxy certificates not allowed, please set the appropriate flag>
362 Proxy certificates not allowed unless the B<-allow_proxy_certs> option is used.
364 =item B<X509_V_ERR_UNNESTED_RESOURCE: RFC 3779 resource not subset of parent's resources>
366 See RFC 3779 for details.
368 =item B<X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: unsupported or invalid name syntax>
370 Unsupported or invalid name syntax.
372 =item B<X509_V_ERR_PATH_LOOP: path loop>
376 =item B<X509_V_ERR_HOSTNAME_MISMATCH: hostname mismatch>
380 =item B<X509_V_ERR_EMAIL_MISMATCH: email address mismatch>
382 Email address mismatch.
384 =item B<X509_V_ERR_IP_ADDRESS_MISMATCH: IP address mismatch>
388 =item B<X509_V_ERR_DANE_NO_MATCH: no matching DANE TLSA records>
390 DANE TLSA authentication is enabled, but no TLSA records matched the
392 This error is only possible in L<openssl-s_client(1)>.
394 =item B<X509_V_ERR_EE_KEY_TOO_SMALL: EE certificate key too weak>
396 EE certificate key too weak.
398 =item B<X509_ERR_CA_KEY_TOO_SMALL: CA certificate key too weak>
400 CA certificate key too weak.
402 =item B<X509_ERR_CA_MD_TOO_WEAK: CA signature digest algorithm too weak>
404 CA signature digest algorithm too weak.
406 =item B<X509_V_ERR_INVALID_CALL: invalid certificate verification context>
408 Invalid certificate verification context.
410 =item B<X509_V_ERR_STORE_LOOKUP: issuer certificate lookup error>
412 Issuer certificate lookup error.
414 =item B<X509_V_ERR_NO_VALID_SCTS: certificate transparency required, but no valid SCTs found>
416 Certificate Transparency required, but no valid SCTs found.
418 =item B<X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION: proxy subject name violation>
420 Proxy subject name violation.
422 =item B<X509_V_ERR_OCSP_VERIFY_NEEDED: OCSP verification needed>
424 Returned by the verify callback to indicate an OCSP verification is needed.
426 =item B<X509_V_ERR_OCSP_VERIFY_FAILED: OCSP verification failed>
428 Returned by the verify callback to indicate OCSP verification failed.
430 =item B<X509_V_ERR_OCSP_CERT_UNKNOWN: OCSP unknown cert>
432 Returned by the verify callback to indicate that the certificate is not
433 recognized by the OCSP responder.
435 =item B<509_V_ERROR_NO_ISSUER_PUBLI_KEY, issuer certificate doesn't have a public key>
437 The issuer certificate does not have a public key.
439 =item B<X509_V_ERROR_SIGNATURE_ALGORITHM_MISMATCH, Subject signature algorithm and issuer public key algorithm mismatch>
441 The issuer's public key is not of the type required by the signature in
442 the subject's certificate.
448 The above functions should be used instead of directly referencing the fields
449 in the B<X509_VERIFY_CTX> structure.
451 In versions of OpenSSL before 1.0 the current certificate returned by
452 X509_STORE_CTX_get_current_cert() was never B<NULL>. Applications should
453 check the return value before printing out any debugging information relating
454 to the current certificate.
456 If an unrecognised error code is passed to X509_verify_cert_error_string() the
457 numerical value of the unknown code is returned in a static buffer. This is not
458 thread safe but will never happen unless an invalid code is passed.
462 L<X509_verify_cert(3)>,
468 Copyright 2009-2020 The OpenSSL Project Authors. All Rights Reserved.
470 Licensed under the Apache License 2.0 (the "License"). You may not use
471 this file except in compliance with the License. You can obtain a copy
472 in the file LICENSE in the source distribution or at
473 L<https://www.openssl.org/source/license.html>.