Merge OpenSSL 1.0.2d.

1 files changed, 269 insertions, 0 deletions

diff --git a/secure/lib/libcrypto/man/X509_check_host.3 b/secure/lib/libcrypto/man/X509_check_host.3
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+.\" ========================================================================
+.\"
+.IX Title "X509_check_host 3"
+.TH X509_check_host 3 "2015-07-09" "1.0.2d" "OpenSSL"
+.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH "NAME"
+X509_check_host, X509_check_email, X509_check_ip, X509_check_ip_asc \- X.509 certificate matching
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/x509.h>
+\&
+\& int X509_check_host(X509 *, const char *name, size_t namelen,
+\&                     unsigned int flags, char **peername);
+\& int X509_check_email(X509 *, const char *address, size_t addresslen,
+\&                      unsigned int flags);
+\& int X509_check_ip(X509 *, const unsigned char *address, size_t addresslen,
+\&                   unsigned int flags);
+\& int X509_check_ip_asc(X509 *, const char *address, unsigned int flags);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+The certificate matching functions are used to check whether a
+certificate matches a given host name, email address, or \s-1IP\s0 address.
+The validity of the certificate and its trust level has to be checked by
+other means.
+.PP
+\&\fIX509_check_host()\fR checks if the certificate Subject Alternative
+Name (\s-1SAN\s0) or Subject CommonName (\s-1CN\s0) matches the specified host
+name, which must be encoded in the preferred name syntax described
+in section 3.5 of \s-1RFC 1034. \s0 By default, wildcards are supported
+and they match  only in the left-most label; but they may match
+part of that label with an explicit prefix or suffix.  For example,
+by default, the host \fBname\fR \*(L"www.example.com\*(R" would match a
+certificate with a \s-1SAN\s0 or \s-1CN\s0 value of \*(L"*.example.com\*(R", \*(L"w*.example.com\*(R"
+or \*(L"*w.example.com\*(R".
+.PP
+Per section 6.4.2 of \s-1RFC 6125, \s0\fBname\fR values representing international
+domain names must be given in A\-label form.  The \fBnamelen\fR argument
+must be the number of characters in the name string or zero in which
+case the length is calculated with strlen(\fBname\fR).  When \fBname\fR starts
+with a dot (e.g \*(L".example.com\*(R"), it will be matched by a certificate
+valid for any sub-domain of \fBname\fR, (see also
+\&\fBX509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS\fR below).
+.PP
+When the certificate is matched, and \fBpeername\fR is not \s-1NULL,\s0 a
+pointer to a copy of the matching \s-1SAN\s0 or \s-1CN\s0 from the peer certificate
+is stored at the address passed in \fBpeername\fR.  The application
+is responsible for freeing the peername via \fIOPENSSL_free()\fR when it
+is no longer needed.
+.PP
+\&\fIX509_check_email()\fR checks if the certificate matches the specified
+email \fBaddress\fR.  Only the mailbox syntax of \s-1RFC 822\s0 is supported,
+comments are not allowed, and no attempt is made to normalize quoted
+characters.  The \fBaddresslen\fR argument must be the number of
+characters in the address string or zero in which case the length
+is calculated with strlen(\fBaddress\fR).
+.PP
+\&\fIX509_check_ip()\fR checks if the certificate matches a specified IPv4 or
+IPv6 address.  The \fBaddress\fR array is in binary format, in network
+byte order.  The length is either 4 (IPv4) or 16 (IPv6).  Only
+explicitly marked addresses in the certificates are considered; \s-1IP\s0
+addresses stored in \s-1DNS\s0 names and Common Names are ignored.
+.PP
+\&\fIX509_check_ip_asc()\fR is similar, except that the NUL-terminated
+string \fBaddress\fR is first converted to the internal representation.
+.PP
+The \fBflags\fR argument is usually 0.  It can be the bitwise \s-1OR\s0 of the
+flags:
+.IP "\fBX509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT\fR," 4
+.IX Item "X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT,"
+.PD 0
+.IP "\fBX509_CHECK_FLAG_NO_WILDCARDS\fR," 4
+.IX Item "X509_CHECK_FLAG_NO_WILDCARDS,"
+.IP "\fBX509_CHECK_FLAG_NO_PARTIAL_WILDCARDS\fR," 4
+.IX Item "X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS,"
+.IP "\fBX509_CHECK_FLAG_MULTI_LABEL_WILDCARDS\fR." 4
+.IX Item "X509_CHECK_FLAG_MULTI_LABEL_WILDCARDS."
+.IP "\fBX509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS\fR." 4
+.IX Item "X509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS."
+.PD
+.PP
+The \fBX509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT\fR flag causes the function
+to consider the subject \s-1DN\s0 even if the certificate contains at least
+one subject alternative name of the right type (\s-1DNS\s0 name or email
+address as appropriate); the default is to ignore the subject \s-1DN\s0
+when at least one corresponding subject alternative names is present.
+.PP
+If set, \fBX509_CHECK_FLAG_NO_WILDCARDS\fR disables wildcard
+expansion; this only applies to \fBX509_check_host\fR.
+.PP
+If set, \fBX509_CHECK_FLAG_NO_PARTIAL_WILDCARDS\fR suppresses support
+for \*(L"*\*(R" as wildcard pattern in labels that have a prefix or suffix,
+such as: \*(L"www*\*(R" or \*(L"*www\*(R"; this only aplies to \fBX509_check_host\fR.
+.PP
+If set, \fBX509_CHECK_FLAG_MULTI_LABEL_WILDCARDS\fR allows a \*(L"*\*(R" that
+constitutes the complete label of a \s-1DNS\s0 name (e.g. \*(L"*.example.com\*(R")
+to match more than one label in \fBname\fR; this flag only applies
+to \fBX509_check_host\fR.
+.PP
+If set, \fBX509_CHECK_FLAG_SINGLE_LABEL_SUBDOMAINS\fR restricts \fBname\fR
+values which start with \*(L".\*(R", that would otherwise match any sub-domain
+in the peer certificate, to only match direct child sub-domains.
+Thus, for instance, with this flag set a \fBname\fR of \*(L".example.com\*(R"
+would match a peer certificate with a \s-1DNS\s0 name of \*(L"www.example.com\*(R",
+but would not match a peer certificate with a \s-1DNS\s0 name of
+\&\*(L"www.sub.example.com\*(R"; this flag only applies to \fBX509_check_host\fR.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+The functions return 1 for a successful match, 0 for a failed match
+and \-1 for an internal error: typically a memory allocation failure
+or an \s-1ASN.1\s0 decoding error.
+.PP
+All functions can also return \-2 if the input is malformed. For example,
+\&\fIX509_check_host()\fR returns \-2 if the provided \fBname\fR contains embedded
+NULs.
+.SH "NOTES"
+.IX Header "NOTES"
+Applications are encouraged to use \fIX509_VERIFY_PARAM_set1_host()\fR
+rather than explicitly calling \fIX509_check_host\fR\|(3). Host name
+checks are out of scope with the \s-1\fIDANE\-EE\s0\fR\|(3) certificate usage,
+and the internal checks will be suppressed as appropriate when
+\&\s-1DANE\s0 support is added to OpenSSL.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fISSL_get_verify_result\fR\|(3),
+\&\fIX509_VERIFY_PARAM_set1_host\fR\|(3),
+\&\fIX509_VERIFY_PARAM_add1_host\fR\|(3),
+\&\fIX509_VERIFY_PARAM_set1_email\fR\|(3),
+\&\fIX509_VERIFY_PARAM_set1_ip\fR\|(3),
+\&\fIX509_VERIFY_PARAM_set1_ipasc\fR\|(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+These functions were added in OpenSSL 1.1.0.