[thirdparty/openssl.git] / doc / man3 / X509_STORE_CTX_get_error.pod

=pod

=head1 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

=head1 SYNOPSIS

 #include <openssl/x509.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);
 void  X509_STORE_CTX_set_error_depth(X509_STORE_CTX *ctx, int depth);
 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx);
 void  X509_STORE_CTX_set_current_cert(X509_STORE_CTX *ctx, X509 *x);
 X509 *X509_STORE_CTX_get0_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);

=head1 DESCRIPTION

These functions are typically called after X509_verify_cert() 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 B<ctx>, see
the B<ERROR CODES> section for a full description of all error codes.

X509_STORE_CTX_set_error() sets the error code of B<ctx> to B<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 B<depth> of the error. This is a
non-negative 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 B<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 certificate in B<ctx> which
caused the error or B<NULL> if no certificate is relevant.

X509_STORE_CTX_set_current_cert() sets the certificate B<x> in B<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 L<X509_up_ref(3)>.
Once such a I<saved> certificate is no longer needed it can be freed with
L<X509_free(3)>.

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

X509_STORE_CTX_get1_chain() returns a complete validate chain if a previous
call to X509_verify_cert() is successful. If the call to X509_verify_cert()
is B<not> successful the returned chain may be incomplete or invalid. The
returned chain persists after the B<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 B<n>.

=head1 RETURN VALUES

X509_STORE_CTX_get_error() returns B<X509_V_OK> or an error code.

X509_STORE_CTX_get_error_depth() returns a non-negative error depth.

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

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

=head1 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".

=over 4

=item B<X509_V_OK: ok>

the operation was successful.

=item B<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.

=item B<X509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate CRL>

the CRL of a certificate could not be found.

=item B<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.

=item B<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.

=item B<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.

=item B<X509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure>

the signature of the certificate is invalid.

=item B<X509_V_ERR_CRL_SIGNATURE_FAILURE: CRL signature failure>

the signature of the certificate is invalid.

=item B<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.

=item B<X509_V_ERR_CERT_HAS_EXPIRED: certificate has expired>

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

=item B<X509_V_ERR_CRL_NOT_YET_VALID: CRL is not yet valid>

the CRL is not yet valid.

=item B<X509_V_ERR_CRL_HAS_EXPIRED: CRL has expired>

the CRL has expired.

=item B<X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: format error in certificate's notBefore field>

the certificate notBefore field contains an invalid time.

=item B<X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: format error in certificate's notAfter field>

the certificate notAfter field contains an invalid time.

=item B<X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: format error in CRL's lastUpdate field>

the CRL lastUpdate field contains an invalid time.

=item B<X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: format error in CRL's nextUpdate field>

the CRL nextUpdate field contains an invalid time.

=item B<X509_V_ERR_OUT_OF_MEM: out of memory>

an error occurred trying to allocate memory. This should never happen.

=item B<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.

=item B<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.

=item B<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.

=item B<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.

=item B<X509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long>

the certificate chain length is greater than the supplied maximum depth. Unused.

=item B<X509_V_ERR_CERT_REVOKED: certificate revoked>

the certificate has been revoked.

=item B<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.

=item B<X509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded>

the basicConstraints path-length parameter has been exceeded.

=item B<X509_V_ERR_INVALID_PURPOSE: unsupported certificate purpose>

the supplied certificate cannot be used for the specified purpose.

=item B<X509_V_ERR_CERT_UNTRUSTED: certificate not trusted>

the root CA is not marked as trusted for the specified purpose.

=item B<X509_V_ERR_CERT_REJECTED: certificate rejected>

the root CA is marked to reject the specified purpose.

=item B<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 B<not> in itself an error.

=item B<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 B<not> in itself an error.

=item B<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 B<not> in itself an error.

=item B<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 B<not> in itself
an error.

=item B<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.


=item B<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.

=item B<X509_V_ERR_NO_EXPLICIT_POLICY: no explicit policy>

The verification flags were set to require and explicit policy but none was
present.

=item B<X509_V_ERR_DIFFERENT_CRL_SCOPE: Different CRL scope>

The only CRLs that could be found did not match the scope of the certificate.

=item B<X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE: Unsupported extension feature>

Some feature of a certificate extension is not supported. Unused.

=item B<X509_V_ERR_PERMITTED_VIOLATION: permitted subtree violation>

A name constraint violation occurred in the permitted subtrees.

=item B<X509_V_ERR_EXCLUDED_VIOLATION: excluded subtree violation>

A name constraint violation occurred in the excluded subtrees.

=item B<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.

=item B<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.

=item B<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.

=item B<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.

=item B<X509_V_ERR_APPLICATION_VERIFICATION: application verification failure>

an application specific error. This will never be returned unless explicitly
set by an application.

=back

=head1 NOTES

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

In versions of OpenSSL before 1.0 the current certificate returned by
X509_STORE_CTX_get_current_cert() was never B<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.

=head1 SEE ALSO

L<X509_verify_cert(3)>,
L<X509_up_ref(3)>,
L<X509_free(3)>.

=head1 COPYRIGHT

Copyright 2009-2016 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
L<https://www.openssl.org/source/license.html>.

=cut
Commit	Line	Data
53246488 DSH	1	=pod
	2
	3	=head1 NAME
	4
f0e0fd51	5	X509_STORE_CTX_get_error, X509_STORE_CTX_set_error,
51227177	6	X509_STORE_CTX_get_error_depth, X509_STORE_CTX_set_error_depth,
c9654873 VD	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
	10	information
53246488 DSH	11
	12	=head1 SYNOPSIS
	13
1e6b8d39	14	#include <openssl/x509.h>
53246488	15
51227177	16	int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx);
c9654873	17	void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int s);
51227177 VD	18	int X509_STORE_CTX_get_error_depth(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(X509_STORE_CTX ctx);
c9654873	21	void X509_STORE_CTX_set_current_cert(X509_STORE_CTX ctx, X509 x);
51227177	22	X509 X509_STORE_CTX_get0_cert(X509_STORE_CTX ctx);
53246488 DSH	23
	24	STACK_OF(X509) X509_STORE_CTX_get1_chain(X509_STORE_CTX ctx);
	25
1e6b8d39 DSH	26	const char *X509_verify_cert_error_string(long n);
1e6b8d39 DSH	27
53246488 DSH	28	=head1 DESCRIPTION
	29
	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.
	32
	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.
	35
	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
	38	checks.
	39
	40	X509_STORE_CTX_get_error_depth() returns the B<depth> of the error. This is a
	41	non-negative integer representing where in the certificate chain the error
478b50cf	42	occurred. If it is zero it occurred in the end entity certificate, one if
53246488 DSH	43	it is the certificate which signed the end entity certificate and so on.
53246488 DSH	44
51227177 VD	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.
	48
53246488 DSH	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.
	51
c9654873 VD	52	X509_STORE_CTX_set_current_cert() sets the certificate B<x> in B<ctx> which
	53	caused the error.
	54	This value is not intended to remain valid for very long, and remains owned by
	55	the caller.
	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
	58	callback.
	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
	62	L<X509_free(3)>.
	63
8162f6f5 RS	64	X509_STORE_CTX_get0_cert() retrieves an internal pointer to the
8162f6f5 RS	65	certificate being verified by the B<ctx>.
c9654873	66
53246488 DSH	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:
	72
2947af32	73	sk_X509_pop_free(chain, X509_free);
53246488	74
1e6b8d39 DSH	75	X509_verify_cert_error_string() returns a human readable error string for
	76	verification error B<n>.
	77
53246488 DSH	78	=head1 RETURN VALUES
53246488 DSH	79
1e6b8d39	80	X509_STORE_CTX_get_error() returns B<X509_V_OK> or an error code.
53246488 DSH	81
	82	X509_STORE_CTX_get_error_depth() returns a non-negative error depth.
	83
186bb907	84	X509_STORE_CTX_get_current_cert() returns the certificate which caused the
53246488 DSH	85	error or B<NULL> if no certificate is relevant to the error.
53246488 DSH	86
1e6b8d39 DSH	87	X509_verify_cert_error_string() returns a human readable error string for
	88	verification error B<n>.
	89
53246488 DSH	90	=head1 ERROR CODES
53246488 DSH	91
1e6b8d39 DSH	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
	94	"unused".
53246488 DSH	95
	96	=over 4
	97
6c17629f	98	=item B<X509_V_OK: ok>
53246488 DSH	99
	100	the operation was successful.
	101
	102	=item B<X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get issuer certificate>
	103
6d5aa88d MU	104	the issuer certificate of a locally looked up certificate could not be found.
6d5aa88d MU	105	This normally means the list of trusted certificates is not complete.
53246488 DSH	106
	107	=item B<X509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate CRL>
	108
	109	the CRL of a certificate could not be found.
	110
	111	=item B<X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: unable to decrypt certificate's signature>
	112
	113	the certificate signature could not be decrypted. This means that the actual
	114	signature value could not be determined rather than it not matching the
	115	expected value, this is only meaningful for RSA keys.
	116
	117	=item B<X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: unable to decrypt CRL's signature>
	118
	119	the CRL signature could not be decrypted: this means that the actual signature
	120	value could not be determined rather than it not matching the expected value.
	121	Unused.
	122
	123	=item B<X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: unable to decode issuer public key>
	124
	125	the public key in the certificate SubjectPublicKeyInfo could not be read.
	126
	127	=item B<X509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure>
	128
	129	the signature of the certificate is invalid.
	130
	131	=item B<X509_V_ERR_CRL_SIGNATURE_FAILURE: CRL signature failure>
	132
	133	the signature of the certificate is invalid.
	134
	135	=item B<X509_V_ERR_CERT_NOT_YET_VALID: certificate is not yet valid>
	136
	137	the certificate is not yet valid: the notBefore date is after the current time.
	138
	139	=item B<X509_V_ERR_CERT_HAS_EXPIRED: certificate has expired>
	140
	141	the certificate has expired: that is the notAfter date is before the current time.
	142
	143	=item B<X509_V_ERR_CRL_NOT_YET_VALID: CRL is not yet valid>
	144
	145	the CRL is not yet valid.
	146
	147	=item B<X509_V_ERR_CRL_HAS_EXPIRED: CRL has expired>
	148
	149	the CRL has expired.
	150
	151	=item B<X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: format error in certificate's notBefore field>
	152
	153	the certificate notBefore field contains an invalid time.
	154
	155	=item B<X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: format error in certificate's notAfter field>
	156
	157	the certificate notAfter field contains an invalid time.
	158
	159	=item B<X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: format error in CRL's lastUpdate field>
	160
	161	the CRL lastUpdate field contains an invalid time.
	162
	163	=item B<X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: format error in CRL's nextUpdate field>
	164
	165	the CRL nextUpdate field contains an invalid time.
	166
	167	=item B<X509_V_ERR_OUT_OF_MEM: out of memory>
	168
	169	an error occurred trying to allocate memory. This should never happen.
170
171	=item B<X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: self signed certificate>
172
173	the passed certificate is self signed and the same certificate cannot be found
174	in the list of trusted certificates.
175
176	=item B<X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: self signed certificate in certificate chain>
177
178	the certificate chain could be built up using the untrusted certificates but
179	the root could not be found locally.
180
181	=item B<X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: unable to get local issuer certificate>
182
6d5aa88d MU	183	the issuer certificate could not be found: this occurs if the issuer certificate
6d5aa88d MU	184	of an untrusted certificate cannot be found.
53246488 DSH	185
	186	=item B<X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: unable to verify the first certificate>
	187
	188	no signatures could be verified because the chain contains only one certificate
	189	and it is not self signed.
	190
	191	=item B<X509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long>
	192
	193	the certificate chain length is greater than the supplied maximum depth. Unused.
	194
	195	=item B<X509_V_ERR_CERT_REVOKED: certificate revoked>
	196
	197	the certificate has been revoked.
	198
	199	=item B<X509_V_ERR_INVALID_CA: invalid CA certificate>
	200
	201	a CA certificate is invalid. Either it is not a CA or its extensions are not
	202	consistent with the supplied purpose.
	203
	204	=item B<X509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded>
	205
0ad69cd6	206	the basicConstraints path-length parameter has been exceeded.
53246488 DSH	207
	208	=item B<X509_V_ERR_INVALID_PURPOSE: unsupported certificate purpose>
	209
	210	the supplied certificate cannot be used for the specified purpose.
	211
	212	=item B<X509_V_ERR_CERT_UNTRUSTED: certificate not trusted>
	213
	214	the root CA is not marked as trusted for the specified purpose.
	215
	216	=item B<X509_V_ERR_CERT_REJECTED: certificate rejected>
	217
	218	the root CA is marked to reject the specified purpose.
	219
	220	=item B<X509_V_ERR_SUBJECT_ISSUER_MISMATCH: subject issuer mismatch>
	221
	222	the current candidate issuer certificate was rejected because its subject name
	223	did not match the issuer name of the current certificate. This is only set
	224	if issuer check debugging is enabled it is used for status notification and
	225	is B<not> in itself an error.
	226
	227	=item B<X509_V_ERR_AKID_SKID_MISMATCH: authority and subject key identifier mismatch>
	228
	229	the current candidate issuer certificate was rejected because its subject key
	230	identifier was present and did not match the authority key identifier current
	231	certificate. This is only set if issuer check debugging is enabled it is used
	232	for status notification and is B<not> in itself an error.
	233
	234	=item B<X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH: authority and issuer serial number mismatch>
	235
	236	the current candidate issuer certificate was rejected because its issuer name
	237	and serial number was present and did not match the authority key identifier of
	238	the current certificate. This is only set if issuer check debugging is enabled
	239	it is used for status notification and is B<not> in itself an error.
	240
	241	=item B<X509_V_ERR_KEYUSAGE_NO_CERTSIGN:key usage does not include certificate signing>
	242
	243	the current candidate issuer certificate was rejected because its keyUsage
	244	extension does not permit certificate signing. This is only set if issuer check
	245	debugging is enabled it is used for status notification and is B<not> in itself
	246	an error.
	247
1e6b8d39 DSH	248	=item B<X509_V_ERR_INVALID_EXTENSION: invalid or inconsistent certificate extension>
	249
	250	A certificate extension had an invalid value (for example an incorrect
	251	encoding) or some value inconsistent with other extensions.
	252
	253
	254	=item B<X509_V_ERR_INVALID_POLICY_EXTENSION: invalid or inconsistent certificate policy extension>
	255
	256	A certificate policies extension had an invalid value (for example an incorrect
	257	encoding) or some value inconsistent with other extensions. This error only
	258	occurs if policy processing is enabled.
	259
	260	=item B<X509_V_ERR_NO_EXPLICIT_POLICY: no explicit policy>
	261
	262	The verification flags were set to require and explicit policy but none was
	263	present.
	264
	265	=item B<X509_V_ERR_DIFFERENT_CRL_SCOPE: Different CRL scope>
	266
	267	The only CRLs that could be found did not match the scope of the certificate.
	268
	269	=item B<X509_V_ERR_UNSUPPORTED_EXTENSION_FEATURE: Unsupported extension feature>
	270
	271	Some feature of a certificate extension is not supported. Unused.
	272
	273	=item B<X509_V_ERR_PERMITTED_VIOLATION: permitted subtree violation>
	274
478b50cf	275	A name constraint violation occurred in the permitted subtrees.
1e6b8d39 DSH	276
	277	=item B<X509_V_ERR_EXCLUDED_VIOLATION: excluded subtree violation>
	278
478b50cf	279	A name constraint violation occurred in the excluded subtrees.
1e6b8d39 DSH	280
	281	=item B<X509_V_ERR_SUBTREE_MINMAX: name constraints minimum and maximum not supported>
	282
	283	A certificate name constraints extension included a minimum or maximum field:
	284	this is not supported.
	285
	286	=item B<X509_V_ERR_UNSUPPORTED_CONSTRAINT_TYPE: unsupported name constraint type>
	287
	288	An unsupported name constraint type was encountered. OpenSSL currently only
	289	supports directory name, DNS name, email and URI types.
	290
	291	=item B<X509_V_ERR_UNSUPPORTED_CONSTRAINT_SYNTAX: unsupported or invalid name constraint syntax>
	292
	293	The format of the name constraint is not recognised: for example an email
	294	address format of a form not mentioned in RFC3280. This could be caused by
	295	a garbage extension or some new feature not currently supported.
	296
	297	=item B<X509_V_ERR_CRL_PATH_VALIDATION_ERROR: CRL path validation error>
	298
478b50cf	299	An error occurred when attempting to verify the CRL path. This error can only
1e6b8d39 DSH	300	happen if extended CRL checking is enabled.
1e6b8d39 DSH	301
53246488 DSH	302	=item B<X509_V_ERR_APPLICATION_VERIFICATION: application verification failure>
	303
	304	an application specific error. This will never be returned unless explicitly
	305	set by an application.
	306
5cc27077 NA	307	=back
5cc27077 NA	308
53246488 DSH	309	=head1 NOTES
	310
	311	The above functions should be used instead of directly referencing the fields
	312	in the B<X509_VERIFY_CTX> structure.
	313
	314	In versions of OpenSSL before 1.0 the current certificate returned by
	315	X509_STORE_CTX_get_current_cert() was never B<NULL>. Applications should
	316	check the return value before printing out any debugging information relating
	317	to the current certificate.
	318
1e6b8d39 DSH	319	If an unrecognised error code is passed to X509_verify_cert_error_string() the
	320	numerical value of the unknown code is returned in a static buffer. This is not
	321	thread safe but will never happen unless an invalid code is passed.
53246488 DSH	322
	323	=head1 SEE ALSO
	324
c9654873 VD	325	L<X509_verify_cert(3)>,
	326	L<X509_up_ref(3)>,
	327	L<X509_free(3)>.
53246488	328
e2f92610 RS	329	=head1 COPYRIGHT
	330
	331	Copyright 2009-2016 The OpenSSL Project Authors. All Rights Reserved.
	332
4746f25a	333	Licensed under the Apache License 2.0 (the "License"). You may not use
e2f92610 RS	334	this file except in compliance with the License. You can obtain a copy
	335	in the file LICENSE in the source distribution or at
	336	L<https://www.openssl.org/source/license.html>.
	337
	338	=cut