5 X509_STORE_CTX_get_error, X509_STORE_CTX_set_error,
6 X509_STORE_CTX_get_error_depth, X509_STORE_CTX_get_current_cert,
7 X509_STORE_CTX_get0_cert,
8 X509_STORE_CTX_get1_chain, X509_verify_cert_error_string - get or set certificate verification status information
12 #include <openssl/x509.h>
13 #include <openssl/x509_vfy.h>
15 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx);
16 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx,int s);
17 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx);
18 X509 * X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx);
19 X509 * X509_STORE_CTX_get0_cert(X509_STORE_CTX *ctx);
21 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx);
23 const char *X509_verify_cert_error_string(long n);
27 These functions are typically called after X509_verify_cert() has indicated
28 an error or in a verification callback to determine the nature of an error.
30 X509_STORE_CTX_get_error() returns the error code of B<ctx>, see
31 the B<ERROR CODES> section for a full description of all error codes.
33 X509_STORE_CTX_set_error() sets the error code of B<ctx> to B<s>. For example
34 it might be used in a verification callback to set an error based on additional
37 X509_STORE_CTX_get_error_depth() returns the B<depth> of the error. This is a
38 non-negative integer representing where in the certificate chain the error
39 occurred. If it is zero it occurred in the end entity certificate, one if
40 it is the certificate which signed the end entity certificate and so on.
42 X509_STORE_CTX_get0_cert() returns the leaf certificate being verified.
44 X509_STORE_CTX_get_current_cert() returns the certificate in B<ctx> which
45 caused the error or B<NULL> if no certificate is relevant.
47 X509_STORE_CTX_get1_chain() returns a complete validate chain if a previous
48 call to X509_verify_cert() is successful. If the call to X509_verify_cert()
49 is B<not> successful the returned chain may be incomplete or invalid. The
50 returned chain persists after the B<ctx> structure is freed, when it is
51 no longer needed it should be free up using:
53 sk_X509_pop_free(chain, X509_free);
55 X509_verify_cert_error_string() returns a human readable error string for
56 verification error B<n>.
60 X509_STORE_CTX_get_error() returns B<X509_V_OK> or an error code.
62 X509_STORE_CTX_get_error_depth() returns a non-negative error depth.
64 X509_STORE_CTX_get_current_cert() returns the certificate which caused the
65 error or B<NULL> if no certificate is relevant to the error.
67 X509_verify_cert_error_string() returns a human readable error string for
68 verification error B<n>.
72 A list of error codes and messages is shown below. Some of the
73 error codes are defined but currently never returned: these are described as
78 =item B<X509_V_OK: ok>
80 the operation was successful.
82 =item B<X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get issuer certificate>
84 the issuer certificate could not be found: this occurs if the issuer certificate
85 of an untrusted certificate cannot be found.
87 =item B<X509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate CRL>
89 the CRL of a certificate could not be found.
91 =item B<X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: unable to decrypt certificate's signature>
93 the certificate signature could not be decrypted. This means that the actual
94 signature value could not be determined rather than it not matching the
95 expected value, this is only meaningful for RSA keys.
97 =item B<X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: unable to decrypt CRL's signature>
99 the CRL signature could not be decrypted: this means that the actual signature
100 value could not be determined rather than it not matching the expected value.
103 =item B<X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: unable to decode issuer public key>
105 the public key in the certificate SubjectPublicKeyInfo could not be read.
107 =item B<X509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure>
109 the signature of the certificate is invalid.
111 =item B<X509_V_ERR_CRL_SIGNATURE_FAILURE: CRL signature failure>
113 the signature of the certificate is invalid.
115 =item B<X509_V_ERR_CERT_NOT_YET_VALID: certificate is not yet valid>
117 the certificate is not yet valid: the notBefore date is after the current time.
119 =item B<X509_V_ERR_CERT_HAS_EXPIRED: certificate has expired>
121 the certificate has expired: that is the notAfter date is before the current time.
123 =item B<X509_V_ERR_CRL_NOT_YET_VALID: CRL is not yet valid>
125 the CRL is not yet valid.
127 =item B<X509_V_ERR_CRL_HAS_EXPIRED: CRL has expired>
131 =item B<X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: format error in certificate's notBefore field>
133 the certificate notBefore field contains an invalid time.
135 =item B<X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: format error in certificate's notAfter field>
137 the certificate notAfter field contains an invalid time.
139 =item B<X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: format error in CRL's lastUpdate field>
141 the CRL lastUpdate field contains an invalid time.
143 =item B<X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: format error in CRL's nextUpdate field>
145 the CRL nextUpdate field contains an invalid time.
147 =item B<X509_V_ERR_OUT_OF_MEM: out of memory>
149 an error occurred trying to allocate memory. This should never happen.
151 =item B<X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: self signed certificate>
153 the passed certificate is self signed and the same certificate cannot be found
154 in the list of trusted certificates.
156 =item B<X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: self signed certificate in certificate chain>
158 the certificate chain could be built up using the untrusted certificates but
159 the root could not be found locally.
161 =item B<X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: unable to get local issuer certificate>
163 the issuer certificate of a locally looked up certificate could not be found.
164 This normally means the list of trusted certificates is not complete.
166 =item B<X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: unable to verify the first certificate>
168 no signatures could be verified because the chain contains only one certificate
169 and it is not self signed.
171 =item B<X509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long>
173 the certificate chain length is greater than the supplied maximum depth. Unused.
175 =item B<X509_V_ERR_CERT_REVOKED: certificate revoked>
177 the certificate has been revoked.
179 =item B<X509_V_ERR_INVALID_CA: invalid CA certificate>
181 a CA certificate is invalid. Either it is not a CA or its extensions are not
182 consistent with the supplied purpose.
184 =item B<X509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded>
186 the basicConstraints pathlength parameter has been exceeded.
188 =item B<X509_V_ERR_INVALID_PURPOSE: unsupported certificate purpose>
190 the supplied certificate cannot be used for the specified purpose.
192 =item B<X509_V_ERR_CERT_UNTRUSTED: certificate not trusted>
194 the root CA is not marked as trusted for the specified purpose.
196 =item B<X509_V_ERR_CERT_REJECTED: certificate rejected>
198 the root CA is marked to reject the specified purpose.
200 =item B<X509_V_ERR_SUBJECT_ISSUER_MISMATCH: subject issuer mismatch>
202 the current candidate issuer certificate was rejected because its subject name
203 did not match the issuer name of the current certificate. This is only set
204 if issuer check debugging is enabled it is used for status notification and
205 is B<not> in itself an error.
207 =item B<X509_V_ERR_AKID_SKID_MISMATCH: authority and subject key identifier mismatch>
209 the current candidate issuer certificate was rejected because its subject key
210 identifier was present and did not match the authority key identifier current
211 certificate. This is only set if issuer check debugging is enabled it is used
212 for status notification and is B<not> in itself an error.
214 =item B<X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH: authority and issuer serial number mismatch>
216 the current candidate issuer certificate was rejected because its issuer name
217 and serial number was present and did not match the authority key identifier of
218 the current certificate. This is only set if issuer check debugging is enabled
219 it is used for status notification and is B<not> in itself an error.
221 =item B<X509_V_ERR_KEYUSAGE_NO_CERTSIGN:key usage does not include certificate signing>
223 the current candidate issuer certificate was rejected because its keyUsage
224 extension does not permit certificate signing. This is only set if issuer check
225 debugging is enabled it is used for status notification and is B<not> in itself
228 =item B<X509_V_ERR_INVALID_EXTENSION: invalid or inconsistent certificate extension>
230 A certificate extension had an invalid value (for example an incorrect
231 encoding) or some value inconsistent with other extensions.
234 =item B<X509_V_ERR_INVALID_POLICY_EXTENSION: invalid or inconsistent certificate policy extension>
236 A certificate policies extension had an invalid value (for example an incorrect
237 encoding) or some value inconsistent with other extensions. This error only
238 occurs if policy processing is enabled.
240 =item B<X509_V_ERR_NO_EXPLICIT_POLICY: no explicit policy>
242 The verification flags were set to require and explicit policy but none was
245 =item B<X509_V_ERR_DIFFERENT_CRL_SCOPE: Different CRL scope>
247 The only CRLs that could be found did not match the scope of the certificate.
249 =item B<X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE: Unsupported extension feature>
251 Some feature of a certificate extension is not supported. Unused.
253 =item B<X509_V_ERR_PERMITTED_VIOLATION: permitted subtree violation>
255 A name constraint violation occurred in the permitted subtrees.
257 =item B<X509_V_ERR_EXCLUDED_VIOLATION: excluded subtree violation>
259 A name constraint violation occurred in the excluded subtrees.
261 =item B<X509_V_ERR_SUBTREE_MINMAX: name constraints minimum and maximum not supported>
263 A certificate name constraints extension included a minimum or maximum field:
264 this is not supported.
266 =item B<X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: unsupported name constraint type>
268 An unsupported name constraint type was encountered. OpenSSL currently only
269 supports directory name, DNS name, email and URI types.
271 =item B<X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: unsupported or invalid name constraint syntax>
273 The format of the name constraint is not recognised: for example an email
274 address format of a form not mentioned in RFC3280. This could be caused by
275 a garbage extension or some new feature not currently supported.
277 =item B<X509_V_ERR_CRL_PATH_VALIDATION_ERROR: CRL path validation error>
279 An error occurred when attempting to verify the CRL path. This error can only
280 happen if extended CRL checking is enabled.
282 =item B<X509_V_ERR_APPLICATION_VERIFICATION: application verification failure>
284 an application specific error. This will never be returned unless explicitly
285 set by an application.
291 The above functions should be used instead of directly referencing the fields
292 in the B<X509_VERIFY_CTX> structure.
294 In versions of OpenSSL before 1.0 the current certificate returned by
295 X509_STORE_CTX_get_current_cert() was never B<NULL>. Applications should
296 check the return value before printing out any debugging information relating
297 to the current certificate.
299 If an unrecognised error code is passed to X509_verify_cert_error_string() the
300 numerical value of the unknown code is returned in a static buffer. This is not
301 thread safe but will never happen unless an invalid code is passed.
305 L<X509_verify_cert(3)>