NAME

       X509_STORE_CTX_get_error, X509_STORE_CTX_set_error, X509_STORE_CTX_get_error_depth,
       X509_STORE_CTX_set_error_depth, X509_STORE_CTX_get_current_cert,
       X509_STORE_CTX_set_current_cert, X509_STORE_CTX_get0_cert, X509_STORE_CTX_get1_chain,
       X509_verify_cert_error_string - get or set certificate verification status information

SYNOPSIS

        #include <openssl/x509.h>

        int   X509_STORE_CTX_get_error(const X509_STORE_CTX *ctx);
        void  X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int s);
        int   X509_STORE_CTX_get_error_depth(const X509_STORE_CTX *ctx);
        void  X509_STORE_CTX_set_error_depth(X509_STORE_CTX *ctx, int depth);
        X509 *X509_STORE_CTX_get_current_cert(const X509_STORE_CTX *ctx);
        void  X509_STORE_CTX_set_current_cert(X509_STORE_CTX *ctx, X509 *x);
        X509 *X509_STORE_CTX_get0_cert(const X509_STORE_CTX *ctx);

        STACK_OF(X509) *X509_STORE_CTX_get1_chain(const X509_STORE_CTX *ctx);

        const char *X509_verify_cert_error_string(long n);

DESCRIPTION

       These functions are typically called after certificate or chain verification using
       X509_verify_cert(3) or X509_STORE_CTX_verify(3) has indicated an error or in a
       verification callback to determine the nature of an error.

       X509_STORE_CTX_get_error() returns the error code of ctx.  See the "ERROR CODES" section
       for a full description of all error codes.  It may return a code != X509_V_OK even if
       X509_verify_cert() did not indicate an error, likely because a verification callback
       function has waived the error.

       X509_STORE_CTX_set_error() sets the error code of ctx to s. For example it might be used
       in a verification callback to set an error based on additional checks.

       X509_STORE_CTX_get_error_depth() returns the depth of the error. This is a nonnegative
       integer representing where in the certificate chain the error occurred. If it is zero it
       occurred in the end entity certificate, one if it is the certificate which signed the end
       entity certificate and so on.

       X509_STORE_CTX_set_error_depth() sets the error depth.  This can be used in combination
       with X509_STORE_CTX_set_error() to set the depth at which an error condition was detected.

       X509_STORE_CTX_get_current_cert() returns the current certificate in ctx. If an error
       occurred, the current certificate will be the one that is most closely related to the
       error, or possibly NULL if no such certificate is relevant.

       X509_STORE_CTX_set_current_cert() sets the certificate x in ctx which caused the error.
       This value is not intended to remain valid for very long, and remains owned by the caller.
       It may be examined by a verification callback invoked to handle each error encountered
       during chain verification and is no longer required after such a callback.  If a callback
       wishes the save the certificate for use after it returns, it needs to increment its
       reference count via X509_up_ref(3).  Once such a saved certificate is no longer needed it
       can be freed with X509_free(3).

       X509_STORE_CTX_get0_cert() retrieves an internal pointer to the certificate being verified
       by the ctx.

       X509_STORE_CTX_get1_chain() returns a complete validate chain if a previous verification
       is successful. Otherwise the returned chain may be incomplete or invalid.  The returned
       chain persists after the ctx structure is freed.  When it is no longer needed it should be
       free up using:

        sk_X509_pop_free(chain, X509_free);

       X509_verify_cert_error_string() returns a human readable error string for verification
       error n.

RETURN VALUES

       X509_STORE_CTX_get_error() returns X509_V_OK or an error code.

       X509_STORE_CTX_get_error_depth() returns a nonnegative error depth.

       X509_STORE_CTX_get_current_cert() returns the certificate which caused the error or NULL
       if no certificate is relevant to the error.

       X509_verify_cert_error_string() returns a human readable error string for verification
       error n.

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 "unused".

       X509_V_OK: ok
           The operation was successful.

       X509_V_ERR_UNSPECIFIED: unspecified certificate verification error
           Unspecified error; should not happen.

       X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get 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.  To allow any
           certificate (not only a self-signed one) in the trust store to terminate the chain the
           X509_V_FLAG_PARTIAL_CHAIN flag may be set.

       X509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate CRL
           The CRL of a certificate could not be found.

       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 RSA keys.

       X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: unable to decrypt CRL's signature
           The CRL 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.

       X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: unable to decode issuer public key
           The public key in the certificate "SubjectPublicKeyInfo" field could not be read.

       X509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure
           The signature of the certificate is invalid.

       X509_V_ERR_CRL_SIGNATURE_FAILURE: CRL signature failure
           The signature of the CRL is invalid.

       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.

       X509_V_ERR_CERT_HAS_EXPIRED: certificate has expired
           The certificate has expired: that is the "notAfter" date is before the current time.

       X509_V_ERR_CRL_NOT_YET_VALID: CRL is not yet valid
           The CRL is not yet valid.

       X509_V_ERR_CRL_HAS_EXPIRED: CRL has expired
           The CRL has expired.

       X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: format error in certificate's notBefore field
           The certificate "notBefore" field contains an invalid time.

       X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: format error in certificate's notAfter field
           The certificate "notAfter" field contains an invalid time.

       X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: format error in CRL's lastUpdate field
           The CRL lastUpdate field contains an invalid time.

       X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: format error in CRL's nextUpdate field
           The CRL "nextUpdate" field contains an invalid time.

       X509_V_ERR_OUT_OF_MEM: out of memory
           An error occurred trying to allocate memory.

       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.

       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 no
           suitable trust anchor (which typically is a self-signed root certificate) could be
           found in the trust store.

       X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: unable to get local issuer certificate
           The issuer certificate could not be found: this occurs if the issuer certificate of an
           untrusted certificate cannot be found.

       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 and the X509_V_FLAG_PARTIAL_CHAIN flag is not set.

       X509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long
           The certificate chain length is greater than the supplied maximum depth.

       X509_V_ERR_CERT_REVOKED: certificate revoked
           The certificate has been revoked.

       X509_V_ERR_INVALID_CA: invalid CA certificate
           A CA certificate is invalid. Either it is not a CA or its extensions are not
           consistent with the supplied purpose.

       X509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded
           The basicConstraints path-length parameter has been exceeded.

       X509_V_ERR_INVALID_PURPOSE: unsuitable certificate purpose
           The target certificate cannot be used for the specified purpose.

       X509_V_ERR_CERT_UNTRUSTED: certificate not trusted
           The root CA is not marked as trusted for the specified purpose.

       X509_V_ERR_CERT_REJECTED: certificate rejected
           The root CA is marked to reject the specified purpose.

       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.

       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.

       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.

       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.

       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.

       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.

       X509_V_ERR_NO_EXPLICIT_POLICY: no explicit policy
           The verification flags were set to require and explicit policy but none was present.

       X509_V_ERR_DIFFERENT_CRL_SCOPE: different CRL scope
           The only CRLs that could be found did not match the scope of the certificate.

       X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE: Unsupported extension feature
           Some feature of a certificate extension is not supported. Unused.

       X509_V_ERR_PERMITTED_VIOLATION: permitted subtree violation
           A name constraint violation occurred in the permitted subtrees.

       X509_V_ERR_EXCLUDED_VIOLATION: excluded subtree violation
           A name constraint violation occurred in the excluded subtrees.

       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.

       X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: unsupported name constraint type
           An unsupported name constraint type was encountered. OpenSSL currently only supports
           directory name, DNS name, email and URI types.

       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 RFC3280. This could be caused by a garbage extension
           or some new feature not currently supported.

       X509_V_ERR_CRL_PATH_VALIDATION_ERROR: CRL path validation error
           An error occurred when attempting to verify the CRL path. This error can only happen
           if extended CRL checking is enabled.

       X509_V_ERR_APPLICATION_VERIFICATION: application verification failure
           An application specific error. This will never be returned unless explicitly set by an
           application callback.

       X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER: unable to get CRL issuer certificate
           Unable to get CRL issuer certificate.

       X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION: unhandled critical extension
           Unhandled critical extension.

       X509_V_ERR_KEYUSAGE_NO_CRL_SIGN: key usage does not include CRL signing
           Key usage does not include CRL signing.

       X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION: unhandled critical CRL extension
           Unhandled critical CRL extension.

       X509_V_ERR_INVALID_NON_CA: invalid non-CA certificate (has CA markings)
           Invalid non-CA certificate has CA markings.

       X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED: proxy path length constraint exceeded
           Proxy path length constraint exceeded.

       X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE: key usage does not include digital signature
           Key usage does not include digital signature, and therefore cannot sign certificates.

       X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED: proxy certificates not allowed, please set the
       appropriate flag
           Proxy certificates not allowed unless the X509_V_FLAG_ALLOW_PROXY_CERTS flag is set.

       X509_V_ERR_UNNESTED_RESOURCE: RFC 3779 resource not subset of parent's resources
           See RFC 3779 for details.

       X509_V_ERR_UNSUPPORTED_NAME_SYNTAX: unsupported or invalid name syntax
           Unsupported or invalid name syntax.

       X509_V_ERR_PATH_LOOP: path loop
           Path loop.

       X509_V_ERR_HOSTNAME_MISMATCH: hostname mismatch
           Hostname mismatch.

       X509_V_ERR_EMAIL_MISMATCH: email address mismatch
           Email address mismatch.

       X509_V_ERR_IP_ADDRESS_MISMATCH: IP address mismatch
           IP address mismatch.

       X509_V_ERR_DANE_NO_MATCH: no matching DANE TLSA records
           DANE TLSA authentication is enabled, but no TLSA records matched the certificate
           chain.  This error is only possible in openssl-s_client(1).

       X509_V_ERR_EE_KEY_TOO_SMALL: EE certificate key too weak
           EE certificate key too weak.

       X509_V_ERR_CA_KEY_TOO_SMALL: CA certificate key too weak
           CA certificate key too weak.

       X509_V_ERR_CA_MD_TOO_WEAK: CA signature digest algorithm too weak
           CA signature digest algorithm too weak.

       X509_V_ERR_INVALID_CALL: invalid certificate verification context
           Invalid certificate verification context.

       X509_V_ERR_STORE_LOOKUP: issuer certificate lookup error
           Issuer certificate lookup error.

       X509_V_ERR_NO_VALID_SCTS: certificate transparency required, but no valid SCTs found
           Certificate Transparency required, but no valid SCTs found.

       X509_V_ERR_PROXY_SUBJECT_NAME_VIOLATION: proxy subject name violation
           Proxy subject name violation.

       X509_V_ERR_OCSP_VERIFY_NEEDED: OCSP verification needed
           Returned by the verify callback to indicate an OCSP verification is needed.

       X509_V_ERR_OCSP_VERIFY_FAILED: OCSP verification failed
           Returned by the verify callback to indicate OCSP verification failed.

       X509_V_ERR_OCSP_CERT_UNKNOWN: OCSP unknown cert
           Returned by the verify callback to indicate that the certificate is not recognized by
           the OCSP responder.

       X509_V_ERR_NO_ISSUER_PUBLIC_KEY: issuer certificate doesn't have a public key
           The issuer certificate does not have a public key.

       X509_V_ERR_SIGNATURE_ALGORITHM_MISMATCH: subject signature algorithm and issuer public key
       algorithm mismatch
           The issuer's public key is not of the type required by the signature in the subject's
           certificate.

NOTES

       The above functions should be used instead of directly referencing the fields in the
       X509_VERIFY_CTX structure.

       In versions of OpenSSL before 1.0 the current certificate returned by
       X509_STORE_CTX_get_current_cert() was never NULL. Applications should check the return
       value before printing out any debugging information relating to the current certificate.

       If an unrecognised error code is passed to X509_verify_cert_error_string() 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.

BUGS

       Previous versions of this documentation swapped the meaning of the
       X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT and X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY
       error codes.

SEE ALSO

       X509_verify_cert(3), X509_STORE_CTX_verify(3), X509_up_ref(3), X509_free(3).

COPYRIGHT

       Copyright 2009-2023 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the Apache License 2.0 (the "License").  You may not use this file except
       in compliance with the License.  You can obtain a copy in the file LICENSE in the source
       distribution or at <https://www.openssl.org/source/license.html>.