371 lines
16 KiB
Groff
371 lines
16 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "X509_VERIFY_PARAM_set_flags 3"
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.TH X509_VERIFY_PARAM_set_flags 3 "2017-05-25" "1.0.2l" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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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
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/x509_vfy.h>
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\&
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\& int X509_VERIFY_PARAM_set_flags(X509_VERIFY_PARAM *param, unsigned long flags);
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\& int X509_VERIFY_PARAM_clear_flags(X509_VERIFY_PARAM *param,
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\& unsigned long flags);
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\& unsigned long X509_VERIFY_PARAM_get_flags(X509_VERIFY_PARAM *param);
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\&
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\& int X509_VERIFY_PARAM_set_purpose(X509_VERIFY_PARAM *param, int purpose);
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\& int X509_VERIFY_PARAM_set_trust(X509_VERIFY_PARAM *param, int trust);
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\&
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\& void X509_VERIFY_PARAM_set_time(X509_VERIFY_PARAM *param, time_t t);
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\&
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\& int X509_VERIFY_PARAM_add0_policy(X509_VERIFY_PARAM *param,
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\& ASN1_OBJECT *policy);
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\& int X509_VERIFY_PARAM_set1_policies(X509_VERIFY_PARAM *param,
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\& STACK_OF(ASN1_OBJECT) *policies);
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\&
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\& void X509_VERIFY_PARAM_set_depth(X509_VERIFY_PARAM *param, int depth);
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\& int X509_VERIFY_PARAM_get_depth(const X509_VERIFY_PARAM *param);
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\&
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\& int X509_VERIFY_PARAM_set1_host(X509_VERIFY_PARAM *param,
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\& const char *name, size_t namelen);
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\& int X509_VERIFY_PARAM_add1_host(X509_VERIFY_PARAM *param,
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\& const char *name, size_t namelen);
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\& void X509_VERIFY_PARAM_set_hostflags(X509_VERIFY_PARAM *param,
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\& unsigned int flags);
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\& char *X509_VERIFY_PARAM_get0_peername(X509_VERIFY_PARAM *param);
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\& int X509_VERIFY_PARAM_set1_email(X509_VERIFY_PARAM *param,
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\& const char *email, size_t emaillen);
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\& int X509_VERIFY_PARAM_set1_ip(X509_VERIFY_PARAM *param,
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\& const unsigned char *ip, size_t iplen);
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\& int X509_VERIFY_PARAM_set1_ip_asc(X509_VERIFY_PARAM *param, const char *ipasc);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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These functions manipulate the \fBX509_VERIFY_PARAM\fR structure associated with
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a certificate verification operation.
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.PP
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The \fIX509_VERIFY_PARAM_set_flags()\fR function sets the flags in \fBparam\fR by oring
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it with \fBflags\fR. See the \fB\s-1VERIFICATION FLAGS\s0\fR section for a complete
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description of values the \fBflags\fR parameter can take.
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.PP
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\&\fIX509_VERIFY_PARAM_get_flags()\fR returns the flags in \fBparam\fR.
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.PP
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\&\fIX509_VERIFY_PARAM_clear_flags()\fR clears the flags \fBflags\fR in \fBparam\fR.
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.PP
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\&\fIX509_VERIFY_PARAM_set_purpose()\fR sets the verification purpose in \fBparam\fR
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to \fBpurpose\fR. This determines the acceptable purpose of the certificate
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chain, for example \s-1SSL\s0 client or \s-1SSL\s0 server.
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.PP
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\&\fIX509_VERIFY_PARAM_set_trust()\fR sets the trust setting in \fBparam\fR to
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\&\fBtrust\fR.
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.PP
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\&\fIX509_VERIFY_PARAM_set_time()\fR sets the verification time in \fBparam\fR to
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\&\fBt\fR. Normally the current time is used.
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.PP
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\&\fIX509_VERIFY_PARAM_add0_policy()\fR enables policy checking (it is disabled
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by default) and adds \fBpolicy\fR to the acceptable policy set.
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.PP
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\&\fIX509_VERIFY_PARAM_set1_policies()\fR enables policy checking (it is disabled
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by default) and sets the acceptable policy set to \fBpolicies\fR. Any existing
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policy set is cleared. The \fBpolicies\fR parameter can be \fB\s-1NULL\s0\fR to clear
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an existing policy set.
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.PP
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\&\fIX509_VERIFY_PARAM_set_depth()\fR sets the maximum verification depth to \fBdepth\fR.
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That is the maximum number of untrusted \s-1CA\s0 certificates that can appear in a
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chain.
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.PP
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\&\fIX509_VERIFY_PARAM_set1_host()\fR sets the expected \s-1DNS\s0 hostname to
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\&\fBname\fR clearing any previously specified host name or names. If
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\&\fBname\fR is \s-1NULL,\s0 or empty the list of hostnames is cleared, and
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name checks are not performed on the peer certificate. If \fBname\fR
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is NUL-terminated, \fBnamelen\fR may be zero, otherwise \fBnamelen\fR
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must be set to the length of \fBname\fR. When a hostname is specified,
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certificate verification automatically invokes \fIX509_check_host\fR\|(3)
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with flags equal to the \fBflags\fR argument given to
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\&\fB\f(BIX509_VERIFY_PARAM_set_hostflags()\fB\fR (default zero). Applications
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are strongly advised to use this interface in preference to explicitly
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calling \fIX509_check_host\fR\|(3), hostname checks are out of scope
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with the \s-1\fIDANE\-EE\s0\fR\|(3) certificate usage, and the internal check will
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be suppressed as appropriate when \s-1DANE\s0 support is added to OpenSSL.
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.PP
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\&\fIX509_VERIFY_PARAM_add1_host()\fR adds \fBname\fR as an additional reference
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identifer that can match the peer's certificate. Any previous names
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set via \fIX509_VERIFY_PARAM_set1_host()\fR or \fIX509_VERIFY_PARAM_add1_host()\fR
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are retained, no change is made if \fBname\fR is \s-1NULL\s0 or empty. When
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multiple names are configured, the peer is considered verified when
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any name matches.
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.PP
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\&\fIX509_VERIFY_PARAM_get0_peername()\fR returns the \s-1DNS\s0 hostname or subject
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CommonName from the peer certificate that matched one of the reference
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identifiers. When wildcard matching is not disabled, or when a
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reference identifier specifies a parent domain (starts with \*(L".\*(R")
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rather than a hostname, the peer name may be a wildcard name or a
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sub-domain of the reference identifier respectively. The return
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string is allocated by the library and is no longer valid once the
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associated \fBparam\fR argument is freed. Applications must not free
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the return value.
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.PP
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\&\fIX509_VERIFY_PARAM_set1_email()\fR sets the expected \s-1RFC822\s0 email address to
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\&\fBemail\fR. If \fBemail\fR is NUL-terminated, \fBemaillen\fR may be zero, otherwise
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\&\fBemaillen\fR must be set to the length of \fBemail\fR. When an email address
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is specified, certificate verification automatically invokes
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\&\fIX509_check_email\fR\|(3).
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.PP
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\&\fIX509_VERIFY_PARAM_set1_ip()\fR sets the expected \s-1IP\s0 address to \fBip\fR.
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The \fBip\fR argument is in binary format, in network byte-order and
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\&\fBiplen\fR must be set to 4 for IPv4 and 16 for IPv6. When an \s-1IP\s0
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address is specified, certificate verification automatically invokes
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\&\fIX509_check_ip\fR\|(3).
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.PP
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\&\fIX509_VERIFY_PARAM_set1_ip_asc()\fR sets the expected \s-1IP\s0 address to
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\&\fBipasc\fR. The \fBipasc\fR argument is a NUL-terminal \s-1ASCII\s0 string:
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dotted decimal quad for IPv4 and colon-separated hexadecimal for
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IPv6. The condensed \*(L"::\*(R" notation is supported for IPv6 addresses.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIX509_VERIFY_PARAM_set_flags()\fR, \fIX509_VERIFY_PARAM_clear_flags()\fR,
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\&\fIX509_VERIFY_PARAM_set_purpose()\fR, \fIX509_VERIFY_PARAM_set_trust()\fR,
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\&\fIX509_VERIFY_PARAM_add0_policy()\fR \fIX509_VERIFY_PARAM_set1_policies()\fR,
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\&\fIX509_VERIFY_PARAM_set1_host()\fR, \fIX509_VERIFY_PARAM_set_hostflags()\fR,
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\&\fIX509_VERIFY_PARAM_set1_email()\fR, \fIX509_VERIFY_PARAM_set1_ip()\fR and
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\&\fIX509_VERIFY_PARAM_set1_ip_asc()\fR return 1 for success and 0 for
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failure.
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.PP
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\&\fIX509_VERIFY_PARAM_get_flags()\fR returns the current verification flags.
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.PP
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\&\fIX509_VERIFY_PARAM_set_time()\fR and \fIX509_VERIFY_PARAM_set_depth()\fR do not return
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values.
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.PP
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\&\fIX509_VERIFY_PARAM_get_depth()\fR returns the current verification depth.
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.SH "VERIFICATION FLAGS"
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.IX Header "VERIFICATION FLAGS"
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The verification flags consists of zero or more of the following flags
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ored together.
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.PP
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\&\fBX509_V_FLAG_CRL_CHECK\fR enables \s-1CRL\s0 checking for the certificate chain leaf
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certificate. An error occurs if a suitable \s-1CRL\s0 cannot be found.
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.PP
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\&\fBX509_V_FLAG_CRL_CHECK_ALL\fR enables \s-1CRL\s0 checking for the entire certificate
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chain.
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.PP
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\&\fBX509_V_FLAG_IGNORE_CRITICAL\fR disabled critical extension checking. By default
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any unhandled critical extensions in certificates or (if checked) CRLs results
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in a fatal error. If this flag is set unhandled critical extensions are
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ignored. \fB\s-1WARNING\s0\fR setting this option for anything other than debugging
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purposes can be a security risk. Finer control over which extensions are
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supported can be performed in the verification callback.
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.PP
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THe \fBX509_V_FLAG_X509_STRICT\fR flag disables workarounds for some broken
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certificates and makes the verification strictly apply \fBX509\fR rules.
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.PP
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\&\fBX509_V_FLAG_ALLOW_PROXY_CERTS\fR enables proxy certificate verification.
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.PP
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\&\fBX509_V_FLAG_POLICY_CHECK\fR enables certificate policy checking, by default
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no policy checking is peformed. Additional information is sent to the
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verification callback relating to policy checking.
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.PP
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\&\fBX509_V_FLAG_EXPLICIT_POLICY\fR, \fBX509_V_FLAG_INHIBIT_ANY\fR and
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\&\fBX509_V_FLAG_INHIBIT_MAP\fR set the \fBrequire explicit policy\fR, \fBinhibit any
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policy\fR and \fBinhibit policy mapping\fR flags respectively as defined in
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\&\fB\s-1RFC3280\s0\fR. Policy checking is automatically enabled if any of these flags
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are set.
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.PP
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If \fBX509_V_FLAG_NOTIFY_POLICY\fR is set and the policy checking is successful
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a special status code is set to the verification callback. This permits it
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to examine the valid policy tree and perform additional checks or simply
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log it for debugging purposes.
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.PP
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By default some additional features such as indirect CRLs and CRLs signed by
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different keys are disabled. If \fBX509_V_FLAG_EXTENDED_CRL_SUPPORT\fR is set
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they are enabled.
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.PP
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If \fBX509_V_FLAG_USE_DELTAS\fR ise set delta CRLs (if present) are used to
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determine certificate status. If not set deltas are ignored.
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.PP
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\&\fBX509_V_FLAG_CHECK_SS_SIGNATURE\fR enables checking of the root \s-1CA\s0 self signed
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cerificate signature. By default this check is disabled because it doesn't
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add any additional security but in some cases applications might want to
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check the signature anyway. A side effect of not checking the root \s-1CA\s0
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signature is that disabled or unsupported message digests on the root \s-1CA\s0
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are not treated as fatal errors.
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.PP
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The \fBX509_V_FLAG_CB_ISSUER_CHECK\fR flag enables debugging of certificate
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issuer checks. It is \fBnot\fR needed unless you are logging certificate
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verification. If this flag is set then additional status codes will be sent
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to the verification callback and it \fBmust\fR be prepared to handle such cases
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without assuming they are hard errors.
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.PP
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The \fBX509_V_FLAG_NO_ALT_CHAINS\fR flag suppresses checking for alternative
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chains. By default, when building a certificate chain, if the first certificate
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chain found is not trusted, then OpenSSL will continue to check to see if an
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alternative chain can be found that is trusted. With this flag set the behaviour
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will match that of OpenSSL versions prior to 1.0.2b.
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.SH "NOTES"
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.IX Header "NOTES"
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The above functions should be used to manipulate verification parameters
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instead of legacy functions which work in specific structures such as
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\&\fIX509_STORE_CTX_set_flags()\fR.
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.SH "BUGS"
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.IX Header "BUGS"
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Delta \s-1CRL\s0 checking is currently primitive. Only a single delta can be used and
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(partly due to limitations of \fBX509_STORE\fR) constructed CRLs are not
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maintained.
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.PP
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If CRLs checking is enable CRLs are expected to be available in the
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corresponding \fBX509_STORE\fR structure. No attempt is made to download
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CRLs from the \s-1CRL\s0 distribution points extension.
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.SH "EXAMPLE"
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.IX Header "EXAMPLE"
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Enable \s-1CRL\s0 checking when performing certificate verification during \s-1SSL \s0
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connections associated with an \fB\s-1SSL_CTX\s0\fR structure \fBctx\fR:
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.PP
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.Vb 5
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\& X509_VERIFY_PARAM *param;
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\& param = X509_VERIFY_PARAM_new();
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\& X509_VERIFY_PARAM_set_flags(param, X509_V_FLAG_CRL_CHECK);
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\& SSL_CTX_set1_param(ctx, param);
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\& X509_VERIFY_PARAM_free(param);
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.Ve
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIX509_verify_cert\fR\|(3),
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\&\fIX509_check_host\fR\|(3),
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\&\fIX509_check_email\fR\|(3),
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\&\fIX509_check_ip\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \fBX509_V_FLAG_NO_ALT_CHAINS\fR flag was added in OpenSSL 1.0.2b
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