path: root/secure/lib/libcrypto/man/man3/SSL_set1_host.3
diff options
authorJung-uk Kim <jkim@FreeBSD.org>2020-02-21 00:33:21 +0000
committerJung-uk Kim <jkim@FreeBSD.org>2020-02-21 00:33:21 +0000
commit6b4382c4054d7c169c6140feaa144ca360a90ead (patch)
tree176bf7fdbae226099058e11e9a429805b6e0af42 /secure/lib/libcrypto/man/man3/SSL_set1_host.3
parent24722aacdb06a5ac6780beef7db856a0f99095c3 (diff)
MFC: r356963
Install man5 and man7 for OpenSSL.
Notes: svn path=/stable/12/; revision=358188
Diffstat (limited to 'secure/lib/libcrypto/man/man3/SSL_set1_host.3')
1 files changed, 249 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/man3/SSL_set1_host.3 b/secure/lib/libcrypto/man/man3/SSL_set1_host.3
new file mode 100644
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--- /dev/null
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@@ -0,0 +1,249 @@
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+.\" ========================================================================
+.IX Title "SSL_SET1_HOST 3"
+.TH SSL_SET1_HOST 3 "2019-09-10" "1.1.1d" "OpenSSL"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+SSL_set1_host, SSL_add1_host, SSL_set_hostflags, SSL_get0_peername \- SSL server verification parameters
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+\& int SSL_set1_host(SSL *s, const char *hostname);
+\& int SSL_add1_host(SSL *s, const char *hostname);
+\& void SSL_set_hostflags(SSL *s, unsigned int flags);
+\& const char *SSL_get0_peername(SSL *s);
+These functions configure server hostname checks in the \s-1SSL\s0 client.
+\&\fBSSL_set1_host()\fR sets the expected \s-1DNS\s0 hostname to \fBname\fR clearing
+any previously specified host name or names. If \fBname\fR is \s-1NULL,\s0
+or the empty string the list of hostnames is cleared, and name
+checks are not performed on the peer certificate. When a non-empty
+\&\fBname\fR is specified, certificate verification automatically checks
+the peer hostname via \fBX509_check_host\fR\|(3) with \fBflags\fR as specified
+via \fBSSL_set_hostflags()\fR. Clients that enable \s-1DANE TLSA\s0 authentication
+via \fBSSL_dane_enable\fR\|(3) should leave it to that function to set
+the primary reference identifier of the peer, and should not call
+\&\fBSSL_add1_host()\fR adds \fBname\fR as an additional reference identifier
+that can match the peer's certificate. Any previous names set via
+\&\fBSSL_set1_host()\fR or \fBSSL_add1_host()\fR are retained, no change is made
+if \fBname\fR is \s-1NULL\s0 or empty. When multiple names are configured,
+the peer is considered verified when any name matches. This function
+is required for \s-1DANE TLSA\s0 in the presence of service name indirection
+via \s-1CNAME, MX\s0 or \s-1SRV\s0 records as specified in \s-1RFC7671, RFC7672\s0 or
+\&\fBSSL_set_hostflags()\fR sets the \fBflags\fR that will be passed to
+\&\fBX509_check_host\fR\|(3) when name checks are applicable, by default
+the \fBflags\fR value is 0. See \fBX509_check_host\fR\|(3) for the list
+of available flags and their meaning.
+\&\fBSSL_get0_peername()\fR returns the \s-1DNS\s0 hostname or subject CommonName
+from the peer certificate that matched one of the reference
+identifiers. When wildcard matching is not disabled, the name
+matched in the peer certificate may be a wildcard name. When one
+of the reference identifiers configured via \fBSSL_set1_host()\fR or
+\&\fBSSL_add1_host()\fR starts with \*(L".\*(R", which indicates a parent domain prefix
+rather than a fixed name, the matched peer name may be a sub-domain
+of the reference identifier. The returned string is allocated by
+the library and is no longer valid once the associated \fBssl\fR handle
+is cleared or freed, or a renegotiation takes place. Applications
+must not free the return value.
+\&\s-1SSL\s0 clients are advised to use these functions in preference to
+explicitly calling \fBX509_check_host\fR\|(3). Hostname checks may be out
+of scope with the \s-1RFC7671 \fBDANE\-EE\s0\fR\|(3) certificate usage, and the
+internal check will be suppressed as appropriate when \s-1DANE\s0 is
+\&\fBSSL_set1_host()\fR and \fBSSL_add1_host()\fR return 1 for success and 0 for
+\&\fBSSL_get0_peername()\fR returns \s-1NULL\s0 if peername verification is not
+applicable (as with \s-1RFC7671 \fBDANE\-EE\s0\fR\|(3)), or no trusted peername was
+matched. Otherwise, it returns the matched peername. To determine
+whether verification succeeded call \fBSSL_get_verify_result\fR\|(3).
+.IX Header "EXAMPLES"
+Suppose \*(L"smtp.example.com\*(R" is the \s-1MX\s0 host of the domain \*(L"example.com\*(R".
+The calls below will arrange to match either the \s-1MX\s0 hostname or the
+destination domain name in the \s-1SMTP\s0 server certificate. Wildcards
+are supported, but must match the entire label. The actual name
+matched in the certificate (which might be a wildcard) is retrieved,
+and must be copied by the application if it is to be retained beyond
+the lifetime of the \s-1SSL\s0 connection.
+.Vb 5
+\& SSL_set_hostflags(ssl, X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS);
+\& if (!SSL_set1_host(ssl, "smtp.example.com"))
+\& /* error */
+\& if (!SSL_add1_host(ssl, "example.com"))
+\& /* error */
+\& /* XXX: Perform SSL_connect() handshake and handle errors here */
+\& if (SSL_get_verify_result(ssl) == X509_V_OK) {
+\& const char *peername = SSL_get0_peername(ssl);
+\& if (peername != NULL)
+\& /* Name checks were in scope and matched the peername */
+\& }
+.IX Header "SEE ALSO"
+.IX Header "HISTORY"
+These functions were added in OpenSSL 1.1.0.
+Copyright 2016\-2019 The OpenSSL Project Authors. All Rights Reserved.
+Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file \s-1LICENSE\s0 in the source distribution or at