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+.rm #[ #] #H #V #F C
+.\" ========================================================================
+.\"
+.IX Title "VERIFY 1"
+.TH VERIFY 1 "2015-12-03" "1.0.2e" "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"
+verify \- Utility to verify certificates.
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+\&\fBopenssl\fR \fBverify\fR
+[\fB\-CApath directory\fR]
+[\fB\-CAfile file\fR]
+[\fB\-purpose purpose\fR]
+[\fB\-policy arg\fR]
+[\fB\-ignore_critical\fR]
+[\fB\-attime timestamp\fR]
+[\fB\-check_ss_sig\fR]
+[\fB\-crlfile file\fR]
+[\fB\-crl_download\fR]
+[\fB\-crl_check\fR]
+[\fB\-crl_check_all\fR]
+[\fB\-policy_check\fR]
+[\fB\-explicit_policy\fR]
+[\fB\-inhibit_any\fR]
+[\fB\-inhibit_map\fR]
+[\fB\-x509_strict\fR]
+[\fB\-extended_crl\fR]
+[\fB\-use_deltas\fR]
+[\fB\-policy_print\fR]
+[\fB\-no_alt_chains\fR]
+[\fB\-untrusted file\fR]
+[\fB\-help\fR]
+[\fB\-issuer_checks\fR]
+[\fB\-trusted file\fR]
+[\fB\-verbose\fR]
+[\fB\-\fR]
+[certificates]
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+The \fBverify\fR command verifies certificate chains.
+.SH "COMMAND OPTIONS"
+.IX Header "COMMAND OPTIONS"
+.IP "\fB\-CApath directory\fR" 4
+.IX Item "-CApath directory"
+A directory of trusted certificates. The certificates should have names
+of the form: hash.0 or have symbolic links to them of this
+form (\*(L"hash\*(R" is the hashed certificate subject name: see the \fB\-hash\fR option
+of the \fBx509\fR utility). Under Unix the \fBc_rehash\fR script will automatically
+create symbolic links to a directory of certificates.
+.IP "\fB\-CAfile file\fR A file of trusted certificates. The file should contain multiple certificates in \s-1PEM\s0 format concatenated together." 4
+.IX Item "-CAfile file A file of trusted certificates. The file should contain multiple certificates in PEM format concatenated together."
+.PD 0
+.IP "\fB\-attime timestamp\fR" 4
+.IX Item "-attime timestamp"
+.PD
+Perform validation checks using time specified by \fBtimestamp\fR and not
+current system time. \fBtimestamp\fR is the number of seconds since
+01.01.1970 (\s-1UNIX\s0 time).
+.IP "\fB\-check_ss_sig\fR" 4
+.IX Item "-check_ss_sig"
+Verify the signature on the self-signed root \s-1CA.\s0 This is disabled by default
+because it doesn't add any security.
+.IP "\fB\-crlfile file\fR" 4
+.IX Item "-crlfile file"
+File containing one or more \s-1CRL\s0's (in \s-1PEM\s0 format) to load.
+.IP "\fB\-crl_download\fR" 4
+.IX Item "-crl_download"
+Attempt to download \s-1CRL\s0 information for this certificate.
+.IP "\fB\-crl_check\fR" 4
+.IX Item "-crl_check"
+Checks end entity certificate validity by attempting to look up a valid \s-1CRL.\s0
+If a valid \s-1CRL\s0 cannot be found an error occurs.
+.IP "\fB\-untrusted file\fR" 4
+.IX Item "-untrusted file"
+A file of untrusted certificates. The file should contain multiple certificates
+in \s-1PEM\s0 format concatenated together.
+.IP "\fB\-purpose purpose\fR" 4
+.IX Item "-purpose purpose"
+The intended use for the certificate. If this option is not specified,
+\&\fBverify\fR will not consider certificate purpose during chain verification.
+Currently accepted uses are \fBsslclient\fR, \fBsslserver\fR, \fBnssslserver\fR,
+\&\fBsmimesign\fR, \fBsmimeencrypt\fR. See the \fB\s-1VERIFY OPERATION\s0\fR section for more
+information.
+.IP "\fB\-help\fR" 4
+.IX Item "-help"
+Print out a usage message.
+.IP "\fB\-verbose\fR" 4
+.IX Item "-verbose"
+Print extra information about the operations being performed.
+.IP "\fB\-issuer_checks\fR" 4
+.IX Item "-issuer_checks"
+Print out diagnostics relating to searches for the issuer certificate of the
+current certificate. This shows why each candidate issuer certificate was
+rejected. The presence of rejection messages does not itself imply that
+anything is wrong; during the normal verification process, several
+rejections may take place.
+.IP "\fB\-policy arg\fR" 4
+.IX Item "-policy arg"
+Enable policy processing and add \fBarg\fR to the user-initial-policy-set (see
+\&\s-1RFC5280\s0). The policy \fBarg\fR can be an object name an \s-1OID\s0 in numeric form.
+This argument can appear more than once.
+.IP "\fB\-policy_check\fR" 4
+.IX Item "-policy_check"
+Enables certificate policy processing.
+.IP "\fB\-explicit_policy\fR" 4
+.IX Item "-explicit_policy"
+Set policy variable require-explicit-policy (see \s-1RFC5280\s0).
+.IP "\fB\-inhibit_any\fR" 4
+.IX Item "-inhibit_any"
+Set policy variable inhibit-any-policy (see \s-1RFC5280\s0).
+.IP "\fB\-inhibit_map\fR" 4
+.IX Item "-inhibit_map"
+Set policy variable inhibit-policy-mapping (see \s-1RFC5280\s0).
+.IP "\fB\-no_alt_chains\fR" 4
+.IX Item "-no_alt_chains"
+When building a certificate chain, if the first certificate chain found is not
+trusted, then OpenSSL will continue to check to see if an alternative chain can
+be found that is trusted. With this option that behaviour is suppressed so that
+only the first chain found is ever used. Using this option will force the
+behaviour to match that of previous OpenSSL versions.
+.IP "\fB\-trusted file\fR" 4
+.IX Item "-trusted file"
+A file of additional trusted certificates. The file should contain multiple
+certificates in \s-1PEM\s0 format concatenated together.
+.IP "\fB\-policy_print\fR" 4
+.IX Item "-policy_print"
+Print out diagnostics related to policy processing.
+.IP "\fB\-crl_check\fR" 4
+.IX Item "-crl_check"
+Checks end entity certificate validity by attempting to look up a valid \s-1CRL.\s0
+If a valid \s-1CRL\s0 cannot be found an error occurs.
+.IP "\fB\-crl_check_all\fR" 4
+.IX Item "-crl_check_all"
+Checks the validity of \fBall\fR certificates in the chain by attempting
+to look up valid CRLs.
+.IP "\fB\-ignore_critical\fR" 4
+.IX Item "-ignore_critical"
+Normally if an unhandled critical extension is present which is not
+supported by OpenSSL the certificate is rejected (as required by \s-1RFC5280\s0).
+If this option is set critical extensions are ignored.
+.IP "\fB\-x509_strict\fR" 4
+.IX Item "-x509_strict"
+For strict X.509 compliance, disable non-compliant workarounds for broken
+certificates.
+.IP "\fB\-extended_crl\fR" 4
+.IX Item "-extended_crl"
+Enable extended \s-1CRL\s0 features such as indirect CRLs and alternate \s-1CRL\s0
+signing keys.
+.IP "\fB\-use_deltas\fR" 4
+.IX Item "-use_deltas"
+Enable support for delta CRLs.
+.IP "\fB\-check_ss_sig\fR" 4
+.IX Item "-check_ss_sig"
+Verify the signature on the self-signed root \s-1CA.\s0 This is disabled by default
+because it doesn't add any security.
+.IP "\fB\-\fR" 4
+.IX Item "-"
+Indicates the last option. All arguments following this are assumed to be
+certificate files. This is useful if the first certificate filename begins
+with a \fB\-\fR.
+.IP "\fBcertificates\fR" 4
+.IX Item "certificates"
+One or more certificates to verify. If no certificates are given, \fBverify\fR
+will attempt to read a certificate from standard input. Certificates must be
+in \s-1PEM\s0 format.
+.SH "VERIFY OPERATION"
+.IX Header "VERIFY OPERATION"
+The \fBverify\fR program uses the same functions as the internal \s-1SSL\s0 and S/MIME
+verification, therefore this description applies to these verify operations
+too.
+.PP
+There is one crucial difference between the verify operations performed
+by the \fBverify\fR program: wherever possible an attempt is made to continue
+after an error whereas normally the verify operation would halt on the
+first error. This allows all the problems with a certificate chain to be
+determined.
+.PP
+The verify operation consists of a number of separate steps.
+.PP
+Firstly a certificate chain is built up starting from the supplied certificate
+and ending in the root \s-1CA.\s0 It is an error if the whole chain cannot be built
+up. The chain is built up by looking up the issuers certificate of the current
+certificate. If a certificate is found which is its own issuer it is assumed
+to be the root \s-1CA.\s0
+.PP
+The process of 'looking up the issuers certificate' itself involves a number
+of steps. In versions of OpenSSL before 0.9.5a the first certificate whose
+subject name matched the issuer of the current certificate was assumed to be
+the issuers certificate. In OpenSSL 0.9.6 and later all certificates
+whose subject name matches the issuer name of the current certificate are
+subject to further tests. The relevant authority key identifier components
+of the current certificate (if present) must match the subject key identifier
+(if present) and issuer and serial number of the candidate issuer, in addition
+the keyUsage extension of the candidate issuer (if present) must permit
+certificate signing.
+.PP
+The lookup first looks in the list of untrusted certificates and if no match
+is found the remaining lookups are from the trusted certificates. The root \s-1CA\s0
+is always looked up in the trusted certificate list: if the certificate to
+verify is a root certificate then an exact match must be found in the trusted
+list.
+.PP
+The second operation is to check every untrusted certificate's extensions for
+consistency with the supplied purpose. If the \fB\-purpose\fR option is not included
+then no checks are done. The supplied or \*(L"leaf\*(R" certificate must have extensions
+compatible with the supplied purpose and all other certificates must also be valid
+\&\s-1CA\s0 certificates. The precise extensions required are described in more detail in
+the \fB\s-1CERTIFICATE EXTENSIONS\s0\fR section of the \fBx509\fR utility.
+.PP
+The third operation is to check the trust settings on the root \s-1CA.\s0 The root
+\&\s-1CA\s0 should be trusted for the supplied purpose. For compatibility with previous
+versions of SSLeay and OpenSSL a certificate with no trust settings is considered
+to be valid for all purposes.
+.PP
+The final operation is to check the validity of the certificate chain. The validity
+period is checked against the current system time and the notBefore and notAfter
+dates in the certificate. The certificate signatures are also checked at this
+point.
+.PP
+If all operations complete successfully then certificate is considered valid. If
+any operation fails then the certificate is not valid.
+.SH "DIAGNOSTICS"
+.IX Header "DIAGNOSTICS"
+When a verify operation fails the output messages can be somewhat cryptic. The
+general form of the error message is:
+.PP
+.Vb 2
+\& server.pem: /C=AU/ST=Queensland/O=CryptSoft Pty Ltd/CN=Test CA (1024 bit)
+\& error 24 at 1 depth lookup:invalid CA certificate
+.Ve
+.PP
+The first line contains the name of the certificate being verified followed by
+the subject name of the certificate. The second line contains the error number
+and the depth. The depth is number of the certificate being verified when a
+problem was detected starting with zero for the certificate being verified itself
+then 1 for the \s-1CA\s0 that signed the certificate and so on. Finally a text version
+of the error number is presented.
+.PP
+An exhaustive list of the error codes and messages is shown below, this also
+includes the name of the error code as defined in the header file x509_vfy.h
+Some of the error codes are defined but never returned: these are described
+as \*(L"unused\*(R".
+.IP "\fB0 X509_V_OK: ok\fR" 4
+.IX Item "0 X509_V_OK: ok"
+the operation was successful.
+.IP "\fB2 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get issuer certificate\fR" 4
+.IX Item "2 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT: unable to get issuer certificate"
+the issuer certificate of a looked up certificate could not be found. This
+normally means the list of trusted certificates is not complete.
+.IP "\fB3 X509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate \s-1CRL\s0\fR" 4
+.IX Item "3 X509_V_ERR_UNABLE_TO_GET_CRL: unable to get certificate CRL"
+the \s-1CRL\s0 of a certificate could not be found.
+.IP "\fB4 X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE: unable to decrypt certificate's signature\fR" 4
+.IX Item "4 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 "\fB5 X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE: unable to decrypt \s-1CRL\s0's signature\fR" 4
+.IX Item "5 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 "\fB6 X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY: unable to decode issuer public key\fR" 4
+.IX Item "6 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 "\fB7 X509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure\fR" 4
+.IX Item "7 X509_V_ERR_CERT_SIGNATURE_FAILURE: certificate signature failure"
+the signature of the certificate is invalid.
+.IP "\fB8 X509_V_ERR_CRL_SIGNATURE_FAILURE: \s-1CRL\s0 signature failure\fR" 4
+.IX Item "8 X509_V_ERR_CRL_SIGNATURE_FAILURE: CRL signature failure"
+the signature of the certificate is invalid.
+.IP "\fB9 X509_V_ERR_CERT_NOT_YET_VALID: certificate is not yet valid\fR" 4
+.IX Item "9 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 "\fB10 X509_V_ERR_CERT_HAS_EXPIRED: certificate has expired\fR" 4
+.IX Item "10 X509_V_ERR_CERT_HAS_EXPIRED: certificate has expired"
+the certificate has expired: that is the notAfter date is before the current time.
+.IP "\fB11 X509_V_ERR_CRL_NOT_YET_VALID: \s-1CRL\s0 is not yet valid\fR" 4
+.IX Item "11 X509_V_ERR_CRL_NOT_YET_VALID: CRL is not yet valid"
+the \s-1CRL\s0 is not yet valid.
+.IP "\fB12 X509_V_ERR_CRL_HAS_EXPIRED: \s-1CRL\s0 has expired\fR" 4
+.IX Item "12 X509_V_ERR_CRL_HAS_EXPIRED: CRL has expired"
+the \s-1CRL\s0 has expired.
+.IP "\fB13 X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD: format error in certificate's notBefore field\fR" 4
+.IX Item "13 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 "\fB14 X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD: format error in certificate's notAfter field\fR" 4
+.IX Item "14 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 "\fB15 X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD: format error in \s-1CRL\s0's lastUpdate field\fR" 4
+.IX Item "15 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 "\fB16 X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD: format error in \s-1CRL\s0's nextUpdate field\fR" 4
+.IX Item "16 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 "\fB17 X509_V_ERR_OUT_OF_MEM: out of memory\fR" 4
+.IX Item "17 X509_V_ERR_OUT_OF_MEM: out of memory"
+an error occurred trying to allocate memory. This should never happen.
+.IP "\fB18 X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: self signed certificate\fR" 4
+.IX Item "18 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 "\fB19 X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN: self signed certificate in certificate chain\fR" 4
+.IX Item "19 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 "\fB20 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY: unable to get local issuer certificate\fR" 4
+.IX Item "20 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.
+.IP "\fB21 X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE: unable to verify the first certificate\fR" 4
+.IX Item "21 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 "\fB22 X509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long\fR" 4
+.IX Item "22 X509_V_ERR_CERT_CHAIN_TOO_LONG: certificate chain too long"
+the certificate chain length is greater than the supplied maximum depth. Unused.
+.IP "\fB23 X509_V_ERR_CERT_REVOKED: certificate revoked\fR" 4
+.IX Item "23 X509_V_ERR_CERT_REVOKED: certificate revoked"
+the certificate has been revoked.
+.IP "\fB24 X509_V_ERR_INVALID_CA: invalid \s-1CA\s0 certificate\fR" 4
+.IX Item "24 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 "\fB25 X509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded\fR" 4
+.IX Item "25 X509_V_ERR_PATH_LENGTH_EXCEEDED: path length constraint exceeded"
+the basicConstraints pathlength parameter has been exceeded.
+.IP "\fB26 X509_V_ERR_INVALID_PURPOSE: unsupported certificate purpose\fR" 4
+.IX Item "26 X509_V_ERR_INVALID_PURPOSE: unsupported certificate purpose"
+the supplied certificate cannot be used for the specified purpose.
+.IP "\fB27 X509_V_ERR_CERT_UNTRUSTED: certificate not trusted\fR" 4
+.IX Item "27 X509_V_ERR_CERT_UNTRUSTED: certificate not trusted"
+the root \s-1CA\s0 is not marked as trusted for the specified purpose.
+.IP "\fB28 X509_V_ERR_CERT_REJECTED: certificate rejected\fR" 4
+.IX Item "28 X509_V_ERR_CERT_REJECTED: certificate rejected"
+the root \s-1CA\s0 is marked to reject the specified purpose.
+.IP "\fB29 X509_V_ERR_SUBJECT_ISSUER_MISMATCH: subject issuer mismatch\fR" 4
+.IX Item "29 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. Only displayed when
+the \fB\-issuer_checks\fR option is set.
+.IP "\fB30 X509_V_ERR_AKID_SKID_MISMATCH: authority and subject key identifier mismatch\fR" 4
+.IX Item "30 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. Only displayed when the \fB\-issuer_checks\fR option is set.
+.IP "\fB31 X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH: authority and issuer serial number mismatch\fR" 4
+.IX Item "31 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. Only displayed when the \fB\-issuer_checks\fR option is set.
+.IP "\fB32 X509_V_ERR_KEYUSAGE_NO_CERTSIGN:key usage does not include certificate signing\fR" 4
+.IX Item "32 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.
+.IP "\fB50 X509_V_ERR_APPLICATION_VERIFICATION: application verification failure\fR" 4
+.IX Item "50 X509_V_ERR_APPLICATION_VERIFICATION: application verification failure"
+an application specific error. Unused.
+.SH "BUGS"
+.IX Header "BUGS"
+Although the issuer checks are a considerable improvement over the old technique they still
+suffer from limitations in the underlying X509_LOOKUP \s-1API.\s0 One consequence of this is that
+trusted certificates with matching subject name must either appear in a file (as specified by the
+\&\fB\-CAfile\fR option) or a directory (as specified by \fB\-CApath\fR. If they occur in both then only
+the certificates in the file will be recognised.
+.PP
+Previous versions of OpenSSL assume certificates with matching subject name are identical and
+mishandled them.
+.PP
+Previous versions of this documentation swapped the meaning of the
+\&\fBX509_V_ERR_UNABLE_TO_GET_ISSUER_CERT\fR and
+\&\fB20 X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY\fR error codes.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fIx509\fR\|(1)
+.SH "HISTORY"
+.IX Header "HISTORY"
+The \-no_alt_chains options was first added to OpenSSL 1.0.2b.
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