be856c0391
the X509_V_FLAG_NO_ALT_CHAINS flag. Conflicts: doc/apps/cms.pod doc/apps/ocsp.pod doc/apps/s_client.pod doc/apps/s_server.pod doc/apps/smime.pod doc/apps/verify.pod Reviewed-by: Rich Salz <rsalz@openssl.org>
244 lines
11 KiB
Text
244 lines
11 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
X509_VERIFY_PARAM_set_flags, X509_VERIFY_PARAM_clear_flags, X509_VERIFY_PARAM_get_flags, X509_VERIFY_PARAM_set_purpose, X509_VERIFY_PARAM_set_trust, X509_VERIFY_PARAM_set_depth, X509_VERIFY_PARAM_get_depth, X509_VERIFY_PARAM_set_time, X509_VERIFY_PARAM_add0_policy, X509_VERIFY_PARAM_set1_policies, X509_VERIFY_PARAM_set1_host, X509_VERIFY_PARAM_add1_host, X509_VERIFY_PARAM_set_hostflags, X509_VERIFY_PARAM_get0_peername, X509_VERIFY_PARAM_set1_email, X509_VERIFY_PARAM_set1_ip, X509_VERIFY_PARAM_set1_ip_asc - X509 verification parameters
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/x509_vfy.h>
|
|
|
|
int X509_VERIFY_PARAM_set_flags(X509_VERIFY_PARAM *param, unsigned long flags);
|
|
int X509_VERIFY_PARAM_clear_flags(X509_VERIFY_PARAM *param,
|
|
unsigned long flags);
|
|
unsigned long X509_VERIFY_PARAM_get_flags(X509_VERIFY_PARAM *param);
|
|
|
|
int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose);
|
|
int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust);
|
|
|
|
void X509_VERIFY_PARAM_set_time(X509_VERIFY_PARAM *param, time_t t);
|
|
|
|
int X509_VERIFY_PARAM_add0_policy(X509_VERIFY_PARAM *param,
|
|
ASN1_OBJECT *policy);
|
|
int X509_VERIFY_PARAM_set1_policies(X509_VERIFY_PARAM *param,
|
|
STACK_OF(ASN1_OBJECT) *policies);
|
|
|
|
void X509_VERIFY_PARAM_set_depth(X509_VERIFY_PARAM *param, int depth);
|
|
int X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param);
|
|
|
|
int X509_VERIFY_PARAM_set1_host(X509_VERIFY_PARAM *param,
|
|
const char *name, size_t namelen);
|
|
int X509_VERIFY_PARAM_add1_host(X509_VERIFY_PARAM *param,
|
|
const char *name, size_t namelen);
|
|
void X509_VERIFY_PARAM_set_hostflags(X509_VERIFY_PARAM *param,
|
|
unsigned int flags);
|
|
char *X509_VERIFY_PARAM_get0_peername(X509_VERIFY_PARAM *param);
|
|
int X509_VERIFY_PARAM_set1_email(X509_VERIFY_PARAM *param,
|
|
const char *email, size_t emaillen);
|
|
int X509_VERIFY_PARAM_set1_ip(X509_VERIFY_PARAM *param,
|
|
const unsigned char *ip, size_t iplen);
|
|
int X509_VERIFY_PARAM_set1_ip_asc(X509_VERIFY_PARAM *param, const char *ipasc);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
These functions manipulate the B<X509_VERIFY_PARAM> structure associated with
|
|
a certificate verification operation.
|
|
|
|
The X509_VERIFY_PARAM_set_flags() function sets the flags in B<param> by oring
|
|
it with B<flags>. See the B<VERIFICATION FLAGS> section for a complete
|
|
description of values the B<flags> parameter can take.
|
|
|
|
X509_VERIFY_PARAM_get_flags() returns the flags in B<param>.
|
|
|
|
X509_VERIFY_PARAM_clear_flags() clears the flags B<flags> in B<param>.
|
|
|
|
X509_VERIFY_PARAM_set_purpose() sets the verification purpose in B<param>
|
|
to B<purpose>. This determines the acceptable purpose of the certificate
|
|
chain, for example SSL client or SSL server.
|
|
|
|
X509_VERIFY_PARAM_set_trust() sets the trust setting in B<param> to
|
|
B<trust>.
|
|
|
|
X509_VERIFY_PARAM_set_time() sets the verification time in B<param> to
|
|
B<t>. Normally the current time is used.
|
|
|
|
X509_VERIFY_PARAM_add0_policy() enables policy checking (it is disabled
|
|
by default) and adds B<policy> to the acceptable policy set.
|
|
|
|
X509_VERIFY_PARAM_set1_policies() enables policy checking (it is disabled
|
|
by default) and sets the acceptable policy set to B<policies>. Any existing
|
|
policy set is cleared. The B<policies> parameter can be B<NULL> to clear
|
|
an existing policy set.
|
|
|
|
X509_VERIFY_PARAM_set_depth() sets the maximum verification depth to B<depth>.
|
|
That is the maximum number of untrusted CA certificates that can appear in a
|
|
chain.
|
|
|
|
X509_VERIFY_PARAM_set1_host() sets the expected DNS hostname to
|
|
B<name> clearing any previously specified host name or names. If
|
|
B<name> is NULL, or empty the list of hostnames is cleared, and
|
|
name checks are not performed on the peer certificate. If B<name>
|
|
is NUL-terminated, B<namelen> may be zero, otherwise B<namelen>
|
|
must be set to the length of B<name>. When a hostname is specified,
|
|
certificate verification automatically invokes L<X509_check_host(3)>
|
|
with flags equal to the B<flags> argument given to
|
|
B<X509_VERIFY_PARAM_set_hostflags()> (default zero). Applications
|
|
are strongly advised to use this interface in preference to explicitly
|
|
calling L<X509_check_host(3)>, hostname checks are out of scope
|
|
with the DANE-EE(3) certificate usage, and the internal check will
|
|
be suppressed as appropriate when DANE support is added to OpenSSL.
|
|
|
|
X509_VERIFY_PARAM_add1_host() adds B<name> as an additional reference
|
|
identifer that can match the peer's certificate. Any previous names
|
|
set via X509_VERIFY_PARAM_set1_host() or X509_VERIFY_PARAM_add1_host()
|
|
are retained, no change is made if B<name> is NULL or empty. When
|
|
multiple names are configured, the peer is considered verified when
|
|
any name matches.
|
|
|
|
X509_VERIFY_PARAM_get0_peername() returns the DNS hostname or subject
|
|
CommonName from the peer certificate that matched one of the reference
|
|
identifiers. When wildcard matching is not disabled, or when a
|
|
reference identifier specifies a parent domain (starts with ".")
|
|
rather than a hostname, the peer name may be a wildcard name or a
|
|
sub-domain of the reference identifier respectively. The return
|
|
string is allocated by the library and is no longer valid once the
|
|
associated B<param> argument is freed. Applications must not free
|
|
the return value.
|
|
|
|
X509_VERIFY_PARAM_set1_email() sets the expected RFC822 email address to
|
|
B<email>. If B<email> is NUL-terminated, B<emaillen> may be zero, otherwise
|
|
B<emaillen> must be set to the length of B<email>. When an email address
|
|
is specified, certificate verification automatically invokes
|
|
L<X509_check_email(3)>.
|
|
|
|
X509_VERIFY_PARAM_set1_ip() sets the expected IP address to B<ip>.
|
|
The B<ip> argument is in binary format, in network byte-order and
|
|
B<iplen> must be set to 4 for IPv4 and 16 for IPv6. When an IP
|
|
address is specified, certificate verification automatically invokes
|
|
L<X509_check_ip(3)>.
|
|
|
|
X509_VERIFY_PARAM_set1_ip_asc() sets the expected IP address to
|
|
B<ipasc>. The B<ipasc> argument is a NUL-terminal ASCII string:
|
|
dotted decimal quad for IPv4 and colon-separated hexadecimal for
|
|
IPv6. The condensed "::" notation is supported for IPv6 addresses.
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
X509_VERIFY_PARAM_set_flags(), X509_VERIFY_PARAM_clear_flags(),
|
|
X509_VERIFY_PARAM_set_purpose(), X509_VERIFY_PARAM_set_trust(),
|
|
X509_VERIFY_PARAM_add0_policy() X509_VERIFY_PARAM_set1_policies(),
|
|
X509_VERIFY_PARAM_set1_host(), X509_VERIFY_PARAM_set_hostflags(),
|
|
X509_VERIFY_PARAM_set1_email(), X509_VERIFY_PARAM_set1_ip() and
|
|
X509_VERIFY_PARAM_set1_ip_asc() return 1 for success and 0 for
|
|
failure.
|
|
|
|
X509_VERIFY_PARAM_get_flags() returns the current verification flags.
|
|
|
|
X509_VERIFY_PARAM_set_time() and X509_VERIFY_PARAM_set_depth() do not return
|
|
values.
|
|
|
|
X509_VERIFY_PARAM_get_depth() returns the current verification depth.
|
|
|
|
=head1 VERIFICATION FLAGS
|
|
|
|
The verification flags consists of zero or more of the following flags
|
|
ored together.
|
|
|
|
B<X509_V_FLAG_CRL_CHECK> enables CRL checking for the certificate chain leaf
|
|
certificate. An error occurs if a suitable CRL cannot be found.
|
|
|
|
B<X509_V_FLAG_CRL_CHECK_ALL> enables CRL checking for the entire certificate
|
|
chain.
|
|
|
|
B<X509_V_FLAG_IGNORE_CRITICAL> disabled critical extension checking. By default
|
|
any unhandled critical extensions in certificates or (if checked) CRLs results
|
|
in a fatal error. If this flag is set unhandled critical extensions are
|
|
ignored. B<WARNING> setting this option for anything other than debugging
|
|
purposes can be a security risk. Finer control over which extensions are
|
|
supported can be performed in the verification callback.
|
|
|
|
THe B<X509_V_FLAG_X509_STRICT> flag disables workarounds for some broken
|
|
certificates and makes the verification strictly apply B<X509> rules.
|
|
|
|
B<X509_V_FLAG_ALLOW_PROXY_CERTS> enables proxy certificate verification.
|
|
|
|
B<X509_V_FLAG_POLICY_CHECK> enables certificate policy checking, by default
|
|
no policy checking is peformed. Additional information is sent to the
|
|
verification callback relating to policy checking.
|
|
|
|
B<X509_V_FLAG_EXPLICIT_POLICY>, B<X509_V_FLAG_INHIBIT_ANY> and
|
|
B<X509_V_FLAG_INHIBIT_MAP> set the B<require explicit policy>, B<inhibit any
|
|
policy> and B<inhibit policy mapping> flags respectively as defined in
|
|
B<RFC3280>. Policy checking is automatically enabled if any of these flags
|
|
are set.
|
|
|
|
If B<X509_V_FLAG_NOTIFY_POLICY> is set and the policy checking is successful
|
|
a special status code is set to the verification callback. This permits it
|
|
to examine the valid policy tree and perform additional checks or simply
|
|
log it for debugging purposes.
|
|
|
|
By default some additional features such as indirect CRLs and CRLs signed by
|
|
different keys are disabled. If B<X509_V_FLAG_EXTENDED_CRL_SUPPORT> is set
|
|
they are enabled.
|
|
|
|
If B<X509_V_FLAG_USE_DELTAS> ise set delta CRLs (if present) are used to
|
|
determine certificate status. If not set deltas are ignored.
|
|
|
|
B<X509_V_FLAG_CHECK_SS_SIGNATURE> enables checking of the root CA self signed
|
|
cerificate signature. By default this check is disabled because it doesn't
|
|
add any additional security but in some cases applications might want to
|
|
check the signature anyway. A side effect of not checking the root CA
|
|
signature is that disabled or unsupported message digests on the root CA
|
|
are not treated as fatal errors.
|
|
|
|
The B<X509_V_FLAG_CB_ISSUER_CHECK> flag enables debugging of certificate
|
|
issuer checks. It is B<not> needed unless you are logging certificate
|
|
verification. If this flag is set then additional status codes will be sent
|
|
to the verification callback and it B<must> be prepared to handle such cases
|
|
without assuming they are hard errors.
|
|
|
|
The B<X509_V_FLAG_NO_ALT_CHAINS> flag suppresses checking for alternative
|
|
chains. By default, 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 flag set the behaviour
|
|
will match that of OpenSSL versions prior to 1.0.2b.
|
|
|
|
=head1 NOTES
|
|
|
|
The above functions should be used to manipulate verification parameters
|
|
instead of legacy functions which work in specific structures such as
|
|
X509_STORE_CTX_set_flags().
|
|
|
|
=head1 BUGS
|
|
|
|
Delta CRL checking is currently primitive. Only a single delta can be used and
|
|
(partly due to limitations of B<X509_STORE>) constructed CRLs are not
|
|
maintained.
|
|
|
|
If CRLs checking is enable CRLs are expected to be available in the
|
|
corresponding B<X509_STORE> structure. No attempt is made to download
|
|
CRLs from the CRL distribution points extension.
|
|
|
|
=head1 EXAMPLE
|
|
|
|
Enable CRL checking when performing certificate verification during SSL
|
|
connections associated with an B<SSL_CTX> structure B<ctx>:
|
|
|
|
X509_VERIFY_PARAM *param;
|
|
param = X509_VERIFY_PARAM_new();
|
|
X509_VERIFY_PARAM_set_flags(param, X509_V_FLAG_CRL_CHECK);
|
|
SSL_CTX_set1_param(ctx, param);
|
|
X509_VERIFY_PARAM_free(param);
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<X509_verify_cert(3)|X509_verify_cert(3)>,
|
|
L<X509_check_host(3)|X509_check_host(3)>,
|
|
L<X509_check_email(3)|X509_check_email(3)>,
|
|
L<X509_check_ip(3)|X509_check_ip(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
The B<X509_V_FLAG_NO_ALT_CHAINS> flag was added in OpenSSL 1.0.2b
|
|
|
|
=cut
|