1=pod
2{- OpenSSL::safe::output_do_not_edit_headers(); -}
3
4=head1 NAME
5
6openssl-verify - certificate verification command
7
8=head1 SYNOPSIS
9
10B<openssl> B<verify>
11[B<-help>]
12[B<-CRLfile> I<filename>|I<uri>]
13[B<-crl_download>]
14[B<-show_chain>]
15[B<-verbose>]
16[B<-trusted> I<filename>|I<uri>]
17[B<-untrusted> I<filename>|I<uri>]
18[B<-vfyopt> I<nm>:I<v>]
19{- $OpenSSL::safe::opt_name_synopsis -}
20{- $OpenSSL::safe::opt_trust_synopsis -}
21{- $OpenSSL::safe::opt_engine_synopsis -}{- $OpenSSL::safe::opt_v_synopsis -}
22{- $OpenSSL::safe::opt_provider_synopsis -}
23[B<-->]
24[I<certificate> ...]
25
26=head1 DESCRIPTION
27
28This command verifies certificate chains. If a certificate chain has multiple
29problems, this program attempts to display all of them.
30
31=head1 OPTIONS
32
33=over 4
34
35=item B<-help>
36
37Print out a usage message.
38
39=item B<-CRLfile> I<filename>|I<uri>
40
41The file or URI should contain one or more CRLs in PEM or DER format.
42This option can be specified more than once to include CRLs from multiple
43sources.
44
45=item B<-crl_download>
46
47Attempt to download CRL information for certificates via their CDP entries.
48
49=item B<-show_chain>
50
51Display information about the certificate chain that has been built (if
52successful). Certificates in the chain that came from the untrusted list will be
53flagged as "untrusted".
54
55=item B<-verbose>
56
57Print extra information about the operations being performed.
58
59=item B<-trusted> I<filename>|I<uri>
60
61A file or URI of (more or less) trusted certificates.
62See L<openssl-verification-options(1)> for more information on trust settings.
63
64This option can be specified more than once to load certificates from multiple
65sources.
66
67=item B<-untrusted> I<filename>|I<uri>
68
69A file or URI of untrusted certificates to use for chain building.
70This option can be specified more than once to load certificates from multiple
71sources.
72
73=item B<-vfyopt> I<nm>:I<v>
74
75Pass options to the signature algorithm during verify operations.
76Names and values of these options are algorithm-specific.
77
78{- $OpenSSL::safe::opt_name_item -}
79
80{- $OpenSSL::safe::opt_engine_item -}
81{- output_off() if $disabled{"deprecated-3.0"}; "" -}
82To load certificates or CRLs that require engine support, specify the
83B<-engine> option before any of the
84B<-trusted>, B<-untrusted> or B<-CRLfile> options.
85{- output_on() if $disabled{"deprecated-3.0"}; "" -}
86
87{- $OpenSSL::safe::opt_trust_item -}
88
89{- $OpenSSL::safe::opt_v_item -}
90
91{- $OpenSSL::safe::opt_provider_item -}
92
93=item B<-->
94
95Indicates the last option. All arguments following this are assumed to be
96certificate files. This is useful if the first certificate filename begins
97with a B<->.
98
99=item I<certificate> ...
100
101One or more target certificates to verify, one per file. If no certificates are
102given, this command will attempt to read a single certificate from standard
103input.
104
105=back
106
107=head1 DIAGNOSTICS
108
109When a verify operation fails the output messages can be somewhat cryptic. The
110general form of the error message is:
111
112 server.pem: /C=AU/ST=Queensland/O=CryptSoft Pty Ltd/CN=Test CA (1024 bit)
113 error 24 at 1 depth lookup:invalid CA certificate
114
115The first line contains the name of the certificate being verified followed by
116the subject name of the certificate. The second line contains the error number
117and the depth. The depth is number of the certificate being verified when a
118problem was detected starting with zero for the target ("leaf") certificate
119itself then 1 for the CA that signed the target certificate and so on.
120Finally a textual version of the error number is presented.
121
122A list of the error codes and messages can be found in
123L<X509_STORE_CTX_get_error(3)>; the full list is defined in the header file
124F<< <openssl/x509_vfy.h> >>.
125
126This command ignores many errors, in order to allow all the problems with a
127certificate chain to be determined.
128
129=head1 SEE ALSO
130
131L<openssl-verification-options(1)>,
132L<openssl-x509(1)>,
133L<ossl_store-file(7)>
134
135=head1 HISTORY
136
137The B<-show_chain> option was added in OpenSSL 1.1.0.
138
139The B<-engine option> was deprecated in OpenSSL 3.0.
140
141=head1 COPYRIGHT
142
143Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
144
145Licensed under the Apache License 2.0 (the "License").  You may not use
146this file except in compliance with the License.  You can obtain a copy
147in the file LICENSE in the source distribution or at
148L<https://www.openssl.org/source/license.html>.
149
150=cut
151