d88926f181
Contributed by: Florian Weimer <fweimer@redhat.com> Fixes to X509 hostname and email address checking. Wildcard matching support. New test program and manual page.
76 lines
2.9 KiB
Text
76 lines
2.9 KiB
Text
=pod
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=head1 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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=head1 SYNOPSIS
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#include <openssl/x509.h>
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int X509_check_host(X509 *, const unsigned char *name,
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size_t namelen, unsigned int flags);
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int X509_check_email(X509 *, const unsigned char *address,
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size_t addresslen, unsigned int flags);
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int X509_check_ip(X509 *, const unsigned char *address,
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size_t addresslen, unsigned int flags);
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int X509_check_ip_asc(X509 *, const char *address, unsigned int flags);
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=head1 DESCRIPTION
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The certificate matching functions are intended to be called to check
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if a certificate matches a given host name, email address, or IP
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address. The validity of the certificate and its trust level has to
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be checked by other means.
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X509_check_host() checks if the certificate matches the specified
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host name, which must be encoded in the preferred name syntax
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described in section 3.5 of RFC 1034. The B<namelen> argument must be
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the number of characters in the name string or zero in which case the
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length is calculated with strlen(name).
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X509_check_email() checks if the certificate matches the specified
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email address. Only the mailbox syntax of RFC 822 is supported,
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comments are not allowed, and no attempt is made to normalize quoted
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characters. The B<addresslen> argument must be the number of
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characters in the address string. The B<namelen> argument must be
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the number of characters in the name string or zero in which case the
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length is calculated with strlen(name).
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X509_check_ip() checks if the certificate matches a specified IPv4 or
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IPv6 address. The B<address> 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; IP
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addresses stored in DNS names and Common Names are ignored.
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X509_check_ip_asc() is similar, except that the NUL-terminated
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string B<address> is first converted to the internal representation.
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The B<flags> argument is usually 0. It can be the bitwise OR of the
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flags B<X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT>,
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B<X509_CHECK_FLAG_NO_WILDCARDS>.
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The B<X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT> flag causes the function
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to check the subject DN even if the certificate contains a subject
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alternative name extension is present; the default is to ignore the
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subject DN in preference of the extension.
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If present, B<X509_CHECK_FLAG_NO_WILDCARDS> disables wildcard
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expansion; this only applies to B<X509_check_host>.
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=head1 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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X509_check_ip_asc() can also return -2 if the IP address string is malformed.
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=head1 SEE ALSO
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L<SSL_get_verify_result(3)|SSL_get_verify_result(3)>
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=head1 HISTORY
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These functions were added in OpenSSL 1.1.0.
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=cut
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