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 certificate or chain verification
31 using L<X509_verify_cert(3)> or L<X509_STORE_CTX_verify(3)> has indicated
32 an error or in a verification callback to determine the nature of an error.
34 X509_STORE_CTX_get_error() returns the error code of I<ctx>.
35 See the L</ERROR CODES> section for a full description of all error codes.
36 It may return a code != X509_V_OK even if X509_verify_cert() did not indicate
37 an error, likely because a verification callback function has waived the error.
39 X509_STORE_CTX_set_error() sets the error code of I<ctx> to I<s>. For example
40 it might be used in a verification callback to set an error based on additional
43 X509_STORE_CTX_get_error_depth() returns the I<depth> of the error. This is a
44 nonnegative integer representing where in the certificate chain the error
45 occurred. If it is zero it occurred in the end entity certificate, one if
46 it is the certificate which signed the end entity certificate and so on.
48 X509_STORE_CTX_set_error_depth() sets the error I<depth>.
49 This can be used in combination with X509_STORE_CTX_set_error() to set the
50 depth at which an error condition was detected.
52 X509_STORE_CTX_get_current_cert() returns the current certificate in
53 I<ctx>. If an error occurred, the current certificate will be the one
54 that is most closely related to the error, or possibly NULL if no such
55 certificate is relevant.
57 X509_STORE_CTX_set_current_cert() sets the certificate I<x> in I<ctx> which
59 This value is not intended to remain valid for very long, and remains owned by
61 It may be examined by a verification callback invoked to handle each error
62 encountered during chain verification and is no longer required after such a
64 If a callback wishes the save the certificate for use after it returns, it
65 needs to increment its reference count via L<X509_up_ref(3)>.
66 Once such a I<saved> certificate is no longer needed it can be freed with
69 X509_STORE_CTX_get0_cert() retrieves an internal pointer to the
70 certificate being verified by the I<ctx>.
72 X509_STORE_CTX_get1_chain() returns a complete validate chain if a previous
73 verification is successful. Otherwise the returned chain may be incomplete or
74 invalid. The returned chain persists after the I<ctx> structure is freed.
75 When it is no longer needed it should be free up using:
77 OSSL_STACK_OF_X509_free(chain);
79 X509_verify_cert_error_string() returns a human readable error string for
80 verification error I<n>.
84 X509_STORE_CTX_get_error() returns B<X509_V_OK> or an error code.
86 X509_STORE_CTX_get_error_depth() returns a nonnegative error depth.
88 X509_STORE_CTX_get_current_cert() returns the certificate which caused the
89 error or NULL if no certificate is relevant to the error.
91 X509_verify_cert_error_string() returns a human readable error string for
92 verification error I<n>.
96 A list of error codes and messages is shown below. Some of the
97 error codes are defined but currently never returned: these are described as
102 =item B<X509_V_OK: ok>
104 The operation was successful.
106 =item B<X509_V_ERR_UNSPECIFIED: unspecified certificate verification error>
108 Unspecified error; should not happen.
110 =item B<X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get issuer certificate>
112 The issuer certificate of a locally looked up certificate could not be found.
113 This normally means the list of trusted certificates is not complete.
114 To allow any certificate (not only a self-signed one) in the trust store
115 to terminate the chain the B<X509_V_FLAG_PARTIAL_CHAIN> flag may be set.
117 =item B<X509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate CRL>
119 The CRL of a certificate could not be found.
121 =item B<X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
122 unable to decrypt certificate's signature>
124 The certificate signature could not be decrypted. This means that the actual
125 signature value could not be determined rather than it not matching the
126 expected value, this is only meaningful for RSA keys.
128 =item B<X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
129 unable to decrypt CRL's signature>
131 The CRL signature could not be decrypted: this means that the actual signature
132 value could not be determined rather than it not matching the expected value.
135 =item B<X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
136 unable to decode issuer public key>
138 The public key in the certificate C<SubjectPublicKeyInfo> field could
141 =item B<X509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure>
143 The signature of the certificate is invalid.
145 =item B<X509_V_ERR_CRL_SIGNATURE_FAILURE: CRL signature failure>
147 The signature of the CRL is invalid.
149 =item B<X509_V_ERR_CERT_NOT_YET_VALID: certificate is not yet valid>
151 The certificate is not yet valid: the C<notBefore> date is after the
154 =item B<X509_V_ERR_CERT_HAS_EXPIRED: certificate has expired>
156 The certificate has expired: that is the C<notAfter> date is before the
159 =item B<X509_V_ERR_CRL_NOT_YET_VALID: CRL is not yet valid>
161 The CRL is not yet valid.
163 =item B<X509_V_ERR_CRL_HAS_EXPIRED: CRL has expired>
167 =item B<X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
168 format error in certificate's notBefore field>
170 The certificate C<notBefore> field contains an invalid time.
172 =item B<X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
173 format error in certificate's notAfter field>
175 The certificate C<notAfter> field contains an invalid time.
177 =item B<X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
178 format error in CRL's lastUpdate field>
180 The CRL B<lastUpdate> field contains an invalid time.
182 =item B<X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
183 format error in CRL's nextUpdate field>
185 The CRL C<nextUpdate> field contains an invalid time.
187 =item B<X509_V_ERR_OUT_OF_MEM: out of memory>
189 An error occurred trying to allocate memory.
191 =item B<X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: self-signed certificate>
193 The passed certificate is self-signed and the same certificate cannot be found
194 in the list of trusted certificates.
196 =item B<X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
197 self-signed certificate in certificate chain>
199 The certificate chain could be built up using the untrusted certificates
200 but no suitable trust anchor (which typically is a self-signed root certificate)
201 could be found in the trust store.
203 =item B<X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
204 unable to get local issuer certificate>
206 The issuer certificate could not be found: this occurs if the issuer certificate
207 of an untrusted certificate cannot be found.
209 =item B<X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
210 unable to verify the first certificate>
212 No signatures could be verified because the chain contains only one certificate
213 and it is not self-signed and the B<X509_V_FLAG_PARTIAL_CHAIN> flag is not set.
215 =item B<X509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long>
217 The certificate chain length is greater than the supplied maximum depth.
219 =item B<X509_V_ERR_CERT_REVOKED: certificate revoked>
221 The certificate has been revoked.
223 =item B<X509_V_ERR_NO_ISSUER_PUBLIC_KEY:
224 issuer certificate doesn't have a public key>
226 The issuer certificate does not have a public key.
228 =item B<X509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded>
230 The basicConstraints path-length parameter has been exceeded.
232 =item B<X509_V_ERR_INVALID_PURPOSE: unsuitable certificate purpose>
234 The target certificate cannot be used for the specified purpose.
236 =item B<X509_V_ERR_CERT_UNTRUSTED: certificate not trusted>
238 The root CA is not marked as trusted for the specified purpose.
240 =item B<X509_V_ERR_CERT_REJECTED: certificate rejected>
242 The root CA is marked to reject the specified purpose.
244 =item B<X509_V_ERR_SUBJECT_ISSUER_MISMATCH: subject issuer mismatch>
246 The current candidate issuer certificate was rejected because its subject name
247 did not match the issuer name of the current certificate.
249 =item B<X509_V_ERR_AKID_SKID_MISMATCH:
250 authority and subject key identifier mismatch>
252 The current candidate issuer certificate was rejected because its subject key
253 identifier was present and did not match the authority key identifier current
256 =item B<X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH:
257 authority and issuer serial number mismatch>
259 The current candidate issuer certificate was rejected because its issuer name
260 and serial number was present and did not match the authority key identifier of
261 the current certificate.
263 =item B<X509_V_ERR_KEYUSAGE_NO_CERTSIGN:
264 key usage does not include certificate signing>
266 The current candidate issuer certificate was rejected because its C<keyUsage>
267 extension does not permit certificate signing.
269 =item B<X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER:
270 unable to get CRL issuer certificate>
272 Unable to get CRL issuer certificate.
274 =item B<X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION: unhandled critical extension>
276 Unhandled critical extension.
278 =item B<X509_V_ERR_KEYUSAGE_NO_CRL_SIGN: key usage does not include CRL signing>
280 Key usage does not include CRL signing.
282 =item B<X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION: unhandled critical CRL extension>
284 Unhandled critical CRL extension.
286 =item B<X509_V_ERR_INVALID_NON_CA: invalid non-CA certificate (has CA markings)>
288 Invalid non-CA certificate has CA markings.
290 =item B<X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED:
291 proxy path length constraint exceeded>
293 Proxy path length constraint exceeded.
295 =item B<X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE:
296 key usage does not include digital signature>
298 Key usage does not include digital signature, and therefore cannot sign
301 =item B<X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED:
302 proxy certificates not allowed, please set the appropriate flag>
304 Proxy certificates not allowed unless the B<X509_V_FLAG_ALLOW_PROXY_CERTS> flag
307 =item B<X509_V_ERR_INVALID_EXTENSION:
308 invalid or inconsistent certificate extension>
310 A certificate extension had an invalid value (for example an incorrect
311 encoding) or some value inconsistent with other extensions.
313 =item B<X509_V_ERR_INVALID_POLICY_EXTENSION:
314 invalid or inconsistent certificate policy extension>
316 A certificate policies extension had an invalid value (for example an incorrect
317 encoding) or some value inconsistent with other extensions. This error only
318 occurs if policy processing is enabled.
320 =item B<X509_V_ERR_NO_EXPLICIT_POLICY: no explicit policy>
322 The verification flags were set to require and explicit policy but none was
325 =item B<X509_V_ERR_DIFFERENT_CRL_SCOPE: different CRL scope>
327 The only CRLs that could be found did not match the scope of the certificate.
329 =item B<X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE: unsupported extension feature>
331 Some feature of a certificate extension is not supported. Unused.
333 =item B<X509_V_ERR_UNNESTED_RESOURCE: RFC 3779 resource not subset of parent's resources>
335 See RFC 3779 for details.
337 =item B<X509_V_ERR_PERMITTED_VIOLATION: permitted subtree violation>
339 A name constraint violation occurred in the permitted subtrees.
341 =item B<X509_V_ERR_EXCLUDED_VIOLATION: excluded subtree violation>
343 A name constraint violation occurred in the excluded subtrees.
345 =item B<X509_V_ERR_SUBTREE_MINMAX:
346 name constraints minimum and maximum not supported>
348 A certificate name constraints extension included a minimum or maximum field:
349 this is not supported.
351 =item B<X509_V_ERR_APPLICATION_VERIFICATION: application verification failure>
353 An application specific error. This will never be returned unless explicitly
354 set by an application callback.
356 =item B<X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE:
357 unsupported name constraint type>
359 An unsupported name constraint type was encountered. OpenSSL currently only
360 supports directory name, DNS name, email and URI types.
362 =item B<X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX:
363 unsupported or invalid name constraint syntax>
365 The format of the name constraint is not recognised: for example an email
366 address format of a form not mentioned in RFC3280. This could be caused by
367 a garbage extension or some new feature not currently supported.
369 =item B<X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: unsupported or invalid name syntax>
371 Unsupported or invalid name syntax.
373 =item B<X509_V_ERR_CRL_PATH_VALIDATION_ERROR: CRL path validation error>
375 An error occurred when attempting to verify the CRL path. This error can only
376 happen if extended CRL checking is enabled.
378 =item B<X509_V_ERR_PATH_LOOP: path loop>
382 =item B<X509_V_ERR_HOSTNAME_MISMATCH: hostname mismatch>
386 =item B<X509_V_ERR_EMAIL_MISMATCH: email address mismatch>
388 Email address mismatch.
390 =item B<X509_V_ERR_IP_ADDRESS_MISMATCH: IP address mismatch>
394 =item B<X509_V_ERR_DANE_NO_MATCH: no matching DANE TLSA records>
396 DANE TLSA authentication is enabled, but no TLSA records matched the
398 This error is only possible in L<openssl-s_client(1)>.
400 =item B<X509_V_ERR_EE_KEY_TOO_SMALL: EE certificate key too weak>
402 EE certificate key too weak.
404 =item B<X509_V_ERR_CA_KEY_TOO_SMALL: CA certificate key too weak>
406 CA certificate key too weak.
408 =item B<X509_V_ERR_CA_MD_TOO_WEAK: CA signature digest algorithm too weak>
410 CA signature digest algorithm too weak.
412 =item B<X509_V_ERR_INVALID_CALL: invalid certificate verification context>
414 Invalid certificate verification context.
416 =item B<X509_V_ERR_STORE_LOOKUP: issuer certificate lookup error>
418 Issuer certificate lookup error.
420 =item B<X509_V_ERR_NO_VALID_SCTS: certificate transparency required, but no valid SCTs found>
422 Certificate Transparency required, but no valid SCTs found.
424 =item B<X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION: proxy subject name violation>
426 Proxy subject name violation.
428 =item B<X509_V_ERR_OCSP_VERIFY_NEEDED: OCSP verification needed>
430 Returned by the verify callback to indicate an OCSP verification is needed.
432 =item B<X509_V_ERR_OCSP_VERIFY_FAILED: OCSP verification failed>
434 Returned by the verify callback to indicate OCSP verification failed.
436 =item B<X509_V_ERR_OCSP_CERT_UNKNOWN: OCSP unknown cert>
438 Returned by the verify callback to indicate that the certificate is not
439 recognized by the OCSP responder.
441 =item B<X509_V_ERR_UNSUPPORTED_SIGNATURE_ALGORITHM:
442 unsupported signature algorithm>
444 Cannot find certificate signature algorithm.
446 =item B<X509_V_ERR_SIGNATURE_ALGORITHM_MISMATCH:
447 subject signature algorithm and issuer public key algorithm mismatch>
449 The issuer's public key is not of the type required by the signature in
450 the subject's certificate.
452 =item B<X509_V_ERR_SIGNATURE_ALGORITHM_INCONSISTENCY:
453 cert info signature and signature algorithm mismatch>
455 The algorithm given in the certificate info is inconsistent
456 with the one used for the certificate signature.
458 =item B<X509_V_ERR_INVALID_CA: invalid CA certificate>
460 A CA certificate is invalid. Either it is not a CA or its extensions are not
461 consistent with the supplied purpose.
467 The above functions should be used instead of directly referencing the fields
468 in the B<X509_VERIFY_CTX> structure.
470 In versions of OpenSSL before 1.0 the current certificate returned by
471 X509_STORE_CTX_get_current_cert() was never NULL. Applications should
472 check the return value before printing out any debugging information relating
473 to the current certificate.
475 If an unrecognised error code is passed to X509_verify_cert_error_string() the
476 numerical value of the unknown code is returned in a static buffer. This is not
477 thread safe but will never happen unless an invalid code is passed.
481 Previous versions of this documentation swapped the meaning of the
482 B<X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT> and
483 B<X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY> error codes.
487 L<X509_verify_cert(3)>, L<X509_STORE_CTX_verify(3)>,
493 Copyright 2009-2021 The OpenSSL Project Authors. All Rights Reserved.
495 Licensed under the Apache License 2.0 (the "License"). You may not use
496 this file except in compliance with the License. You can obtain a copy
497 in the file LICENSE in the source distribution or at
498 L<https://www.openssl.org/source/license.html>.