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.\" ========================================================================
.\"
.IX Title "SSL_get_peer_cert_chain 3"
.TH SSL_get_peer_cert_chain 3 "2019-12-20" "1.0.2u" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
SSL_get_peer_cert_chain \- get the X509 certificate chain of the peer
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ssl.h>
\&
\& STACK_OF(X509) *SSL_get_peer_cert_chain(const SSL *ssl);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fISSL_get_peer_cert_chain()\fR returns a pointer to \s-1STACK_OF\s0(X509) certificates
forming the certificate chain of the peer. If called on the client side,
the stack also contains the peer's certificate; if called on the server
side, the peer's certificate must be obtained separately using
\&\fISSL_get_peer_certificate\fR\|(3).
If the peer did not present a certificate, \s-1NULL\s0 is returned.
.SH "NOTES"
.IX Header "NOTES"
The peer certificate chain is not necessarily available after reusing
a session, in which case a \s-1NULL\s0 pointer is returned.
.PP
The reference count of the \s-1STACK_OF\s0(X509) object is not incremented.
If the corresponding session is freed, the pointer must not be used
any longer.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
The following return values can occur:
.IP "\s-1NULL\s0" 4
.IX Item "NULL"
No certificate was presented by the peer or no connection was established
or the certificate chain is no longer available when a session is reused.
.IP "Pointer to a \s-1STACK_OF\s0(X509)" 4
.IX Item "Pointer to a STACK_OF(X509)"
The return value points to the certificate chain presented by the peer.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIssl\fR\|(3), \fISSL_get_peer_certificate\fR\|(3)