forked from cory/tildefriends
Cory McWilliams
09ddfffa6b
git-svn-id: https://www.unprompted.com/svn/projects/tildefriends/trunk@4088 ed5197a5-7fde-0310-b194-c3ffbd925b24
289 lines
11 KiB
Groff
289 lines
11 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "X509_CHECK_HOST 3"
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.TH X509_CHECK_HOST 3 "2020-04-21" "1.1.1g" "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_check_host, X509_check_email, X509_check_ip, X509_check_ip_asc \- X.509 certificate matching
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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/x509v3.h>
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\&
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\& int X509_check_host(X509 *, const char *name, size_t namelen,
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\& unsigned int flags, char **peername);
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\& int X509_check_email(X509 *, const char *address, size_t addresslen,
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\& unsigned int flags);
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\& int X509_check_ip(X509 *, const unsigned char *address, size_t addresslen,
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\& unsigned int flags);
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\& int X509_check_ip_asc(X509 *, const char *address, unsigned int flags);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The certificate matching functions are used to check whether a
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certificate matches a given host name, email address, or \s-1IP\s0 address.
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The validity of the certificate and its trust level has to be checked by
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other means.
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.PP
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\&\fBX509_check_host()\fR checks if the certificate Subject Alternative
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Name (\s-1SAN\s0) or Subject CommonName (\s-1CN\s0) matches the specified host
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name, which must be encoded in the preferred name syntax described
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in section 3.5 of \s-1RFC 1034.\s0 By default, wildcards are supported
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and they match only in the left-most label; but they may match
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part of that label with an explicit prefix or suffix. For example,
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by default, the host \fBname\fR \*(L"www.example.com\*(R" would match a
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certificate with a \s-1SAN\s0 or \s-1CN\s0 value of \*(L"*.example.com\*(R", \*(L"w*.example.com\*(R"
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or \*(L"*w.example.com\*(R".
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.PP
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Per section 6.4.2 of \s-1RFC 6125,\s0 \fBname\fR values representing international
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domain names must be given in A\-label form. The \fBnamelen\fR argument
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must be the number of characters in the name string or zero in which
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case the length is calculated with strlen(\fBname\fR). When \fBname\fR starts
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with a dot (e.g \*(L".example.com\*(R"), it will be matched by a certificate
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valid for any sub-domain of \fBname\fR, (see also
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\&\fBX509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS\fR below).
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.PP
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When the certificate is matched, and \fBpeername\fR is not \s-1NULL,\s0 a
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pointer to a copy of the matching \s-1SAN\s0 or \s-1CN\s0 from the peer certificate
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is stored at the address passed in \fBpeername\fR. The application
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is responsible for freeing the peername via \fBOPENSSL_free()\fR when it
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is no longer needed.
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.PP
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\&\fBX509_check_email()\fR checks if the certificate matches the specified
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email \fBaddress\fR. Only the mailbox syntax of \s-1RFC 822\s0 is supported,
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comments are not allowed, and no attempt is made to normalize quoted
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characters. The \fBaddresslen\fR argument must be the number of
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characters in the address string or zero in which case the length
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is calculated with strlen(\fBaddress\fR).
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.PP
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\&\fBX509_check_ip()\fR checks if the certificate matches a specified IPv4 or
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IPv6 address. The \fBaddress\fR array is in binary format, in network
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byte order. The length is either 4 (IPv4) or 16 (IPv6). Only
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explicitly marked addresses in the certificates are considered; \s-1IP\s0
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addresses stored in \s-1DNS\s0 names and Common Names are ignored.
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.PP
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\&\fBX509_check_ip_asc()\fR is similar, except that the NUL-terminated
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string \fBaddress\fR is first converted to the internal representation.
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.PP
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The \fBflags\fR argument is usually 0. It can be the bitwise \s-1OR\s0 of the
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flags:
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.IP "\fBX509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT\fR," 4
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.IX Item "X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT,"
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.PD 0
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.IP "\fBX509_CHECK_FLAG_NEVER_CHECK_SUBJECT\fR," 4
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.IX Item "X509_CHECK_FLAG_NEVER_CHECK_SUBJECT,"
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.IP "\fBX509_CHECK_FLAG_NO_WILDCARDS\fR," 4
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.IX Item "X509_CHECK_FLAG_NO_WILDCARDS,"
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.IP "\fBX509_CHECK_FLAG_NO_PARTIAL_WILDCARDS\fR," 4
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.IX Item "X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS,"
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.IP "\fBX509_CHECK_FLAG_MULTI_LABEL_WILDCARDS\fR." 4
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.IX Item "X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS."
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.IP "\fBX509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS\fR." 4
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.IX Item "X509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS."
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.PD
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.PP
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The \fBX509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT\fR flag causes the function
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to consider the subject \s-1DN\s0 even if the certificate contains at least
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one subject alternative name of the right type (\s-1DNS\s0 name or email
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address as appropriate); the default is to ignore the subject \s-1DN\s0
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when at least one corresponding subject alternative names is present.
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.PP
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The \fBX509_CHECK_FLAG_NEVER_CHECK_SUBJECT\fR flag causes the function to never
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consider the subject \s-1DN\s0 even if the certificate contains no subject alternative
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names of the right type (\s-1DNS\s0 name or email address as appropriate); the default
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is to use the subject \s-1DN\s0 when no corresponding subject alternative names are
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present.
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If both \fBX509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT\fR and
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\&\fBX509_CHECK_FLAG_NEVER_CHECK_SUBJECT\fR are specified, the latter takes
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precedence and the subject \s-1DN\s0 is not checked for matching names.
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.PP
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If set, \fBX509_CHECK_FLAG_NO_WILDCARDS\fR disables wildcard
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expansion; this only applies to \fBX509_check_host\fR.
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.PP
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If set, \fBX509_CHECK_FLAG_NO_PARTIAL_WILDCARDS\fR suppresses support
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for \*(L"*\*(R" as wildcard pattern in labels that have a prefix or suffix,
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such as: \*(L"www*\*(R" or \*(L"*www\*(R"; this only applies to \fBX509_check_host\fR.
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.PP
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If set, \fBX509_CHECK_FLAG_MULTI_LABEL_WILDCARDS\fR allows a \*(L"*\*(R" that
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constitutes the complete label of a \s-1DNS\s0 name (e.g. \*(L"*.example.com\*(R")
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to match more than one label in \fBname\fR; this flag only applies
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to \fBX509_check_host\fR.
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.PP
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If set, \fBX509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS\fR restricts \fBname\fR
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values which start with \*(L".\*(R", that would otherwise match any sub-domain
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in the peer certificate, to only match direct child sub-domains.
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Thus, for instance, with this flag set a \fBname\fR of \*(L".example.com\*(R"
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would match a peer certificate with a \s-1DNS\s0 name of \*(L"www.example.com\*(R",
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but would not match a peer certificate with a \s-1DNS\s0 name of
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\&\*(L"www.sub.example.com\*(R"; this flag only applies to \fBX509_check_host\fR.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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The functions return 1 for a successful match, 0 for a failed match
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and \-1 for an internal error: typically a memory allocation failure
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or an \s-1ASN.1\s0 decoding error.
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.PP
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All functions can also return \-2 if the input is malformed. For example,
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\&\fBX509_check_host()\fR returns \-2 if the provided \fBname\fR contains embedded
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NULs.
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.SH "NOTES"
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.IX Header "NOTES"
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Applications are encouraged to use \fBX509_VERIFY_PARAM_set1_host()\fR
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rather than explicitly calling \fBX509_check_host\fR\|(3). Host name
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checks may be out of scope with the \s-1\fBDANE\-EE\s0\fR\|(3) certificate usage,
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and the internal checks will be suppressed as appropriate when
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\&\s-1DANE\s0 support is enabled.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fBSSL_get_verify_result\fR\|(3),
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\&\fBX509_VERIFY_PARAM_set1_host\fR\|(3),
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\&\fBX509_VERIFY_PARAM_add1_host\fR\|(3),
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\&\fBX509_VERIFY_PARAM_set1_email\fR\|(3),
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\&\fBX509_VERIFY_PARAM_set1_ip\fR\|(3),
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\&\fBX509_VERIFY_PARAM_set1_ipasc\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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These functions were added in OpenSSL 1.0.2.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2012\-2018 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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