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+.\" ========================================================================
+.\"
+.IX Title "X509_STORE_CTX_get_error 3"
+.TH X509_STORE_CTX_get_error 3 "2013-02-11" "1.0.1e" "OpenSSL"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+X509_STORE_CTX_get_error, X509_STORE_CTX_set_error, X509_STORE_CTX_get_error_depth, X509_STORE_CTX_get_current_cert, X509_STORE_CTX_get1_chain, X509_verify_cert_error_string \- get or set certificate verification status information
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 2
+\& #include <openssl/x509.h>
+\& #include <openssl/x509_vfy.h>
+\&
+\& int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx);
+\& void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx,int s);
+\& int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx);
+\& X509 * X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx);
+\&
+\& STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx);
+\&
+\& const char *X509_verify_cert_error_string(long n);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+These functions are typically called after \fIX509_verify_cert()\fR has indicated
+an error or in a verification callback to determine the nature of an error.
+.PP
+\&\fIX509_STORE_CTX_get_error()\fR returns the error code of \fBctx\fR, see
+the \fB\s-1ERROR\s0 \s-1CODES\s0\fR section for a full description of all error codes.
+.PP
+\&\fIX509_STORE_CTX_set_error()\fR sets the error code of \fBctx\fR to \fBs\fR. For example
+it might be used in a verification callback to set an error based on additional
+checks.
+.PP
+\&\fIX509_STORE_CTX_get_error_depth()\fR returns the \fBdepth\fR of the error. This is a
+non-negative integer representing where in the certificate chain the error
+occurred. If it is zero it occured in the end entity certificate, one if
+it is the certificate which signed the end entity certificate and so on.
+.PP
+\&\fIX509_STORE_CTX_get_current_cert()\fR returns the certificate in \fBctx\fR which
+caused the error or \fB\s-1NULL\s0\fR if no certificate is relevant.
+.PP
+\&\fIX509_STORE_CTX_get1_chain()\fR returns a complete validate chain if a previous
+call to \fIX509_verify_cert()\fR is successful. If the call to \fIX509_verify_cert()\fR
+is \fBnot\fR successful the returned chain may be incomplete or invalid. The
+returned chain persists after the \fBctx\fR structure is freed, when it is
+no longer needed it should be free up using:
+.PP
+.Vb 1
+\& sk_X509_pop_free(chain, X509_free);
+.Ve
+.PP
+\&\fIX509_verify_cert_error_string()\fR returns a human readable error string for
+verification error \fBn\fR.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIX509_STORE_CTX_get_error()\fR returns \fBX509_V_OK\fR or an error code.
+.PP
+\&\fIX509_STORE_CTX_get_error_depth()\fR returns a non-negative error depth.
+.PP
+\&\fIX509_STORE_CTX_get_current_cert()\fR returns the cerificate which caused the
+error or \fB\s-1NULL\s0\fR if no certificate is relevant to the error.
+.PP
+\&\fIX509_verify_cert_error_string()\fR returns a human readable error string for
+verification error \fBn\fR.
+.SH "ERROR CODES"
+.IX Header "ERROR CODES"
+A list of error codes and messages is shown below. Some of the
+error codes are defined but currently never returned: these are described as
+\&\*(L"unused\*(R".
+.IP "\fBX509_V_OK: ok\fR" 4
+.IX Item "X509_V_OK: ok"
+the operation was successful.
+.IP "\fBX509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get issuer certificate\fR" 4
+.IX Item "X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get issuer certificate"
+the issuer certificate could not be found: this occurs if the issuer certificate
+of an untrusted certificate cannot be found.
+.IP "\fBX509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate \s-1CRL\s0\fR" 4
+.IX Item "X509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate CRL"
+the \s-1CRL\s0 of a certificate could not be found.
+.IP "\fBX509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: unable to decrypt certificate's signature\fR" 4
+.IX Item "X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: unable to decrypt certificate's signature"
+the certificate signature could not be decrypted. This means that the actual
+signature value could not be determined rather than it not matching the
+expected value, this is only meaningful for \s-1RSA\s0 keys.
+.IP "\fBX509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: unable to decrypt \s-1CRL\s0's signature\fR" 4
+.IX Item "X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: unable to decrypt CRL's signature"
+the \s-1CRL\s0 signature could not be decrypted: this means that the actual signature
+value could not be determined rather than it not matching the expected value.
+Unused.
+.IP "\fBX509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: unable to decode issuer public key\fR" 4
+.IX Item "X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: unable to decode issuer public key"
+the public key in the certificate SubjectPublicKeyInfo could not be read.
+.IP "\fBX509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure\fR" 4
+.IX Item "X509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure"
+the signature of the certificate is invalid.
+.IP "\fBX509_V_ERR_CRL_SIGNATURE_FAILURE: \s-1CRL\s0 signature failure\fR" 4
+.IX Item "X509_V_ERR_CRL_SIGNATURE_FAILURE: CRL signature failure"
+the signature of the certificate is invalid.
+.IP "\fBX509_V_ERR_CERT_NOT_YET_VALID: certificate is not yet valid\fR" 4
+.IX Item "X509_V_ERR_CERT_NOT_YET_VALID: certificate is not yet valid"
+the certificate is not yet valid: the notBefore date is after the current time.
+.IP "\fBX509_V_ERR_CERT_HAS_EXPIRED: certificate has expired\fR" 4
+.IX Item "X509_V_ERR_CERT_HAS_EXPIRED: certificate has expired"
+the certificate has expired: that is the notAfter date is before the current time.
+.IP "\fBX509_V_ERR_CRL_NOT_YET_VALID: \s-1CRL\s0 is not yet valid\fR" 4
+.IX Item "X509_V_ERR_CRL_NOT_YET_VALID: CRL is not yet valid"
+the \s-1CRL\s0 is not yet valid.
+.IP "\fBX509_V_ERR_CRL_HAS_EXPIRED: \s-1CRL\s0 has expired\fR" 4
+.IX Item "X509_V_ERR_CRL_HAS_EXPIRED: CRL has expired"
+the \s-1CRL\s0 has expired.
+.IP "\fBX509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: format error in certificate's notBefore field\fR" 4
+.IX Item "X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: format error in certificate's notBefore field"
+the certificate notBefore field contains an invalid time.
+.IP "\fBX509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: format error in certificate's notAfter field\fR" 4
+.IX Item "X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: format error in certificate's notAfter field"
+the certificate notAfter field contains an invalid time.
+.IP "\fBX509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: format error in \s-1CRL\s0's lastUpdate field\fR" 4
+.IX Item "X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: format error in CRL's lastUpdate field"
+the \s-1CRL\s0 lastUpdate field contains an invalid time.
+.IP "\fBX509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: format error in \s-1CRL\s0's nextUpdate field\fR" 4
+.IX Item "X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: format error in CRL's nextUpdate field"
+the \s-1CRL\s0 nextUpdate field contains an invalid time.
+.IP "\fBX509_V_ERR_OUT_OF_MEM: out of memory\fR" 4
+.IX Item "X509_V_ERR_OUT_OF_MEM: out of memory"
+an error occurred trying to allocate memory. This should never happen.
+.IP "\fBX509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: self signed certificate\fR" 4
+.IX Item "X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: self signed certificate"
+the passed certificate is self signed and the same certificate cannot be found
+in the list of trusted certificates.
+.IP "\fBX509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: self signed certificate in certificate chain\fR" 4
+.IX Item "X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: self signed certificate in certificate chain"
+the certificate chain could be built up using the untrusted certificates but
+the root could not be found locally.
+.IP "\fBX509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: unable to get local issuer certificate\fR" 4
+.IX Item "X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: unable to get local issuer certificate"
+the issuer certificate of a locally looked up certificate could not be found.
+This normally means the list of trusted certificates is not complete.
+.IP "\fBX509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: unable to verify the first certificate\fR" 4
+.IX Item "X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: unable to verify the first certificate"
+no signatures could be verified because the chain contains only one certificate
+and it is not self signed.
+.IP "\fBX509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long\fR" 4
+.IX Item "X509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long"
+the certificate chain length is greater than the supplied maximum depth. Unused.
+.IP "\fBX509_V_ERR_CERT_REVOKED: certificate revoked\fR" 4
+.IX Item "X509_V_ERR_CERT_REVOKED: certificate revoked"
+the certificate has been revoked.
+.IP "\fBX509_V_ERR_INVALID_CA: invalid \s-1CA\s0 certificate\fR" 4
+.IX Item "X509_V_ERR_INVALID_CA: invalid CA certificate"
+a \s-1CA\s0 certificate is invalid. Either it is not a \s-1CA\s0 or its extensions are not
+consistent with the supplied purpose.
+.IP "\fBX509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded\fR" 4
+.IX Item "X509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded"
+the basicConstraints pathlength parameter has been exceeded.
+.IP "\fBX509_V_ERR_INVALID_PURPOSE: unsupported certificate purpose\fR" 4
+.IX Item "X509_V_ERR_INVALID_PURPOSE: unsupported certificate purpose"
+the supplied certificate cannot be used for the specified purpose.
+.IP "\fBX509_V_ERR_CERT_UNTRUSTED: certificate not trusted\fR" 4
+.IX Item "X509_V_ERR_CERT_UNTRUSTED: certificate not trusted"
+the root \s-1CA\s0 is not marked as trusted for the specified purpose.
+.IP "\fBX509_V_ERR_CERT_REJECTED: certificate rejected\fR" 4
+.IX Item "X509_V_ERR_CERT_REJECTED: certificate rejected"
+the root \s-1CA\s0 is marked to reject the specified purpose.
+.IP "\fBX509_V_ERR_SUBJECT_ISSUER_MISMATCH: subject issuer mismatch\fR" 4
+.IX Item "X509_V_ERR_SUBJECT_ISSUER_MISMATCH: subject issuer mismatch"
+the current candidate issuer certificate was rejected because its subject name
+did not match the issuer name of the current certificate. This is only set
+if issuer check debugging is enabled it is used for status notification and
+is \fBnot\fR in itself an error.
+.IP "\fBX509_V_ERR_AKID_SKID_MISMATCH: authority and subject key identifier mismatch\fR" 4
+.IX Item "X509_V_ERR_AKID_SKID_MISMATCH: authority and subject key identifier mismatch"
+the current candidate issuer certificate was rejected because its subject key
+identifier was present and did not match the authority key identifier current
+certificate. This is only set if issuer check debugging is enabled it is used
+for status notification and is \fBnot\fR in itself an error.
+.IP "\fBX509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH: authority and issuer serial number mismatch\fR" 4
+.IX Item "X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH: authority and issuer serial number mismatch"
+the current candidate issuer certificate was rejected because its issuer name
+and serial number was present and did not match the authority key identifier of
+the current certificate. This is only set if issuer check debugging is enabled
+it is used for status notification and is \fBnot\fR in itself an error.
+.IP "\fBX509_V_ERR_KEYUSAGE_NO_CERTSIGN:key usage does not include certificate signing\fR" 4
+.IX Item "X509_V_ERR_KEYUSAGE_NO_CERTSIGN:key usage does not include certificate signing"
+the current candidate issuer certificate was rejected because its keyUsage
+extension does not permit certificate signing. This is only set if issuer check
+debugging is enabled it is used for status notification and is \fBnot\fR in itself
+an error.
+.IP "\fBX509_V_ERR_INVALID_EXTENSION: invalid or inconsistent certificate extension\fR" 4
+.IX Item "X509_V_ERR_INVALID_EXTENSION: invalid or inconsistent certificate extension"
+A certificate extension had an invalid value (for example an incorrect
+encoding) or some value inconsistent with other extensions.
+.IP "\fBX509_V_ERR_INVALID_POLICY_EXTENSION: invalid or inconsistent certificate policy extension\fR" 4
+.IX Item "X509_V_ERR_INVALID_POLICY_EXTENSION: invalid or inconsistent certificate policy extension"
+A certificate policies extension had an invalid value (for example an incorrect
+encoding) or some value inconsistent with other extensions. This error only
+occurs if policy processing is enabled.
+.IP "\fBX509_V_ERR_NO_EXPLICIT_POLICY: no explicit policy\fR" 4
+.IX Item "X509_V_ERR_NO_EXPLICIT_POLICY: no explicit policy"
+The verification flags were set to require and explicit policy but none was
+present.
+.IP "\fBX509_V_ERR_DIFFERENT_CRL_SCOPE: Different \s-1CRL\s0 scope\fR" 4
+.IX Item "X509_V_ERR_DIFFERENT_CRL_SCOPE: Different CRL scope"
+The only CRLs that could be found did not match the scope of the certificate.
+.IP "\fBX509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE: Unsupported extension feature\fR" 4
+.IX Item "X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE: Unsupported extension feature"
+Some feature of a certificate extension is not supported. Unused.
+.IP "\fBX509_V_ERR_PERMITTED_VIOLATION: permitted subtree violation\fR" 4
+.IX Item "X509_V_ERR_PERMITTED_VIOLATION: permitted subtree violation"
+A name constraint violation occured in the permitted subtrees.
+.IP "\fBX509_V_ERR_EXCLUDED_VIOLATION: excluded subtree violation\fR" 4
+.IX Item "X509_V_ERR_EXCLUDED_VIOLATION: excluded subtree violation"
+A name constraint violation occured in the excluded subtrees.
+.IP "\fBX509_V_ERR_SUBTREE_MINMAX: name constraints minimum and maximum not supported\fR" 4
+.IX Item "X509_V_ERR_SUBTREE_MINMAX: name constraints minimum and maximum not supported"
+A certificate name constraints extension included a minimum or maximum field:
+this is not supported.
+.IP "\fBX509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: unsupported name constraint type\fR" 4
+.IX Item "X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: unsupported name constraint type"
+An unsupported name constraint type was encountered. OpenSSL currently only
+supports directory name, \s-1DNS\s0 name, email and \s-1URI\s0 types.
+.IP "\fBX509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: unsupported or invalid name constraint syntax\fR" 4
+.IX Item "X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: unsupported or invalid name constraint syntax"
+The format of the name constraint is not recognised: for example an email
+address format of a form not mentioned in \s-1RFC3280\s0. This could be caused by
+a garbage extension or some new feature not currently supported.
+.IP "\fBX509_V_ERR_CRL_PATH_VALIDATION_ERROR: \s-1CRL\s0 path validation error\fR" 4
+.IX Item "X509_V_ERR_CRL_PATH_VALIDATION_ERROR: CRL path validation error"
+An error occured when attempting to verify the \s-1CRL\s0 path. This error can only
+happen if extended \s-1CRL\s0 checking is enabled.
+.IP "\fBX509_V_ERR_APPLICATION_VERIFICATION: application verification failure\fR" 4
+.IX Item "X509_V_ERR_APPLICATION_VERIFICATION: application verification failure"
+an application specific error. This will never be returned unless explicitly
+set by an application.
+.SH "NOTES"
+.IX Header "NOTES"
+The above functions should be used instead of directly referencing the fields
+in the \fBX509_VERIFY_CTX\fR structure.
+.PP
+In versions of OpenSSL before 1.0 the current certificate returned by
+\&\fIX509_STORE_CTX_get_current_cert()\fR was never \fB\s-1NULL\s0\fR. Applications should
+check the return value before printing out any debugging information relating
+to the current certificate.
+.PP
+If an unrecognised error code is passed to \fIX509_verify_cert_error_string()\fR the
+numerical value of the unknown code is returned in a static buffer. This is not
+thread safe but will never happen unless an invalid code is passed.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fIX509_verify_cert\fR\|(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\s-1TBA\s0
+.SH "POD ERRORS"
+.IX Header "POD ERRORS"
+Hey! \fBThe above document had some coding errors, which are explained below:\fR
+.IP "Around line 281:" 4
+.IX Item "Around line 281:"
+You forgot a '=back' before '=head1'
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