X509_VERIFY_PARAM_set_purpose (3)
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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 parametersSYNOPSIS
#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);
DESCRIPTION
These functions manipulate the X509_VERIFY_PARAM structure associated with a certificate verification operation.The X509_VERIFY_PARAM_set_flags() function sets the flags in param by oring it with flags. See the
X509_VERIFY_PARAM_get_flags() returns the flags in param.
X509_VERIFY_PARAM_clear_flags() clears the flags flags in param.
X509_VERIFY_PARAM_set_purpose() sets the verification purpose in param to purpose. This determines the acceptable purpose of the certificate chain, for example
X509_VERIFY_PARAM_set_trust() sets the trust setting in param to trust.
X509_VERIFY_PARAM_set_time() sets the verification time in param to t. Normally the current time is used.
X509_VERIFY_PARAM_add0_policy() enables policy checking (it is disabled by default) and adds 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 policies. Any existing policy set is cleared. The policies parameter can be
X509_VERIFY_PARAM_set_depth() sets the maximum verification depth to depth. That is the maximum number of untrusted
X509_VERIFY_PARAM_set1_host() sets the expected
X509_VERIFY_PARAM_add1_host() adds 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 name is
X509_VERIFY_PARAM_get0_peername() returns the
X509_VERIFY_PARAM_set1_email() sets the expected
X509_VERIFY_PARAM_set1_ip() sets the expected
X509_VERIFY_PARAM_set1_ip_asc() sets the expected
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.
VERIFICATION FLAGS
The verification flags consists of zero or more of the following flags ored together.X509_V_FLAG_CRL_CHECK enables
X509_V_FLAG_CRL_CHECK_ALL enables
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.
THe X509_V_FLAG_X509_STRICT flag disables workarounds for some broken certificates and makes the verification strictly apply X509 rules.
X509_V_FLAG_ALLOW_PROXY_CERTS enables proxy certificate verification.
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.
X509_V_FLAG_EXPLICIT_POLICY, X509_V_FLAG_INHIBIT_ANY and X509_V_FLAG_INHIBIT_MAP set the require explicit policy, inhibit any policy and inhibit policy mapping flags respectively as defined in
If 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 X509_V_FLAG_EXTENDED_CRL_SUPPORT is set they are enabled.
If X509_V_FLAG_USE_DELTAS ise set delta CRLs (if present) are used to determine certificate status. If not set deltas are ignored.
X509_V_FLAG_CHECK_SS_SIGNATURE enables checking of the root
The X509_V_FLAG_CB_ISSUER_CHECK flag enables debugging of certificate issuer checks. It is 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 must be prepared to handle such cases without assuming they are hard errors.
The 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.
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().BUGS
DeltaIf CRLs checking is enable CRLs are expected to be available in the corresponding X509_STORE structure. No attempt is made to download CRLs from the
EXAMPLE
Enable
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);