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/*++
/* NAME
/* tls_proxy_context_scan
/* SUMMARY
/* read TLS session state from stream
/* SYNOPSIS
/* #include <tls_proxy.h>
/*
/* int tls_proxy_context_scan(scan_fn, stream, flags, ptr)
/* ATTR_SCAN_COMMON_FN scan_fn;
/* VSTREAM *stream;
/* int flags;
/* void *ptr;
/*
/* void tls_proxy_context_free(tls_context)
/* TLS_SESS_STATE *tls_context;
/* DESCRIPTION
/* tls_proxy_context_scan() reads the public members of a
/* TLS_ATTR_STATE structure from the named stream using the
/* specified attribute scan routine. tls_proxy_context_scan()
/* is meant to be passed as a call-back to attr_scan() as shown
/* below.
/*
/* tls_proxy_context_free() destroys a TLS context object that
/* was received with tls_proxy_context_scan().
/*
/* TLS_ATTR_STATE *tls_context = 0;
/* ...
/* ... RECV_ATTR_FUNC(tls_proxy_context_scan, (void *) &tls_context), ...
/* ...
/* if (tls_context)
/* tls_proxy_context_free(tls_context);
/* DIAGNOSTICS
/* Fatal: out of memory.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*
/* Wietse Venema
/* Google, Inc.
/* 111 8th Avenue
/* New York, NY 10011, USA
/*--*/
#ifdef USE_TLS
/* System library. */
#include <sys_defs.h>
/* Utility library */
#include <attr.h>
#include <msg.h>
/* TLS library. */
#include <tls.h>
#include <tls_proxy.h>
/* tls_proxy_context_scan - receive TLS session state from stream */
int tls_proxy_context_scan(ATTR_SCAN_COMMON_FN scan_fn, VSTREAM *fp,
int flags, void *ptr)
{
TLS_SESS_STATE *tls_context
= (TLS_SESS_STATE *) mymalloc(sizeof(*tls_context));;
int ret;
VSTRING *peer_CN = vstring_alloc(25);
VSTRING *issuer_CN = vstring_alloc(25);
VSTRING *peer_cert_fprint = vstring_alloc(60); /* 60 for SHA-1 */
VSTRING *peer_pkey_fprint = vstring_alloc(60); /* 60 for SHA-1 */
VSTRING *protocol = vstring_alloc(25);
VSTRING *cipher_name = vstring_alloc(25);
VSTRING *kex_name = vstring_alloc(25);
VSTRING *kex_curve = vstring_alloc(25);
VSTRING *clnt_sig_name = vstring_alloc(25);
VSTRING *clnt_sig_curve = vstring_alloc(25);
VSTRING *clnt_sig_dgst = vstring_alloc(25);
VSTRING *srvr_sig_name = vstring_alloc(25);
VSTRING *srvr_sig_curve = vstring_alloc(25);
VSTRING *srvr_sig_dgst = vstring_alloc(25);
VSTRING *namaddr = vstring_alloc(100);
if (msg_verbose)
msg_info("begin tls_proxy_context_scan");
/*
* Note: memset() is not a portable way to initialize non-integer types.
*/
memset(tls_context, 0, sizeof(*tls_context));
ret = scan_fn(fp, flags | ATTR_FLAG_MORE,
RECV_ATTR_STR(TLS_ATTR_PEER_CN, peer_CN),
RECV_ATTR_STR(TLS_ATTR_ISSUER_CN, issuer_CN),
RECV_ATTR_STR(TLS_ATTR_PEER_CERT_FPT, peer_cert_fprint),
RECV_ATTR_STR(TLS_ATTR_PEER_PKEY_FPT, peer_pkey_fprint),
RECV_ATTR_INT(TLS_ATTR_SEC_LEVEL,
&tls_context->level),
RECV_ATTR_INT(TLS_ATTR_PEER_STATUS,
&tls_context->peer_status),
RECV_ATTR_STR(TLS_ATTR_CIPHER_PROTOCOL, protocol),
RECV_ATTR_STR(TLS_ATTR_CIPHER_NAME, cipher_name),
RECV_ATTR_INT(TLS_ATTR_CIPHER_USEBITS,
&tls_context->cipher_usebits),
RECV_ATTR_INT(TLS_ATTR_CIPHER_ALGBITS,
&tls_context->cipher_algbits),
RECV_ATTR_STR(TLS_ATTR_KEX_NAME, kex_name),
RECV_ATTR_STR(TLS_ATTR_KEX_CURVE, kex_curve),
RECV_ATTR_INT(TLS_ATTR_KEX_BITS, &tls_context->kex_bits),
RECV_ATTR_STR(TLS_ATTR_CLNT_SIG_NAME, clnt_sig_name),
RECV_ATTR_STR(TLS_ATTR_CLNT_SIG_CURVE, clnt_sig_curve),
RECV_ATTR_INT(TLS_ATTR_CLNT_SIG_BITS, &tls_context->clnt_sig_bits),
RECV_ATTR_STR(TLS_ATTR_CLNT_SIG_DGST, clnt_sig_dgst),
RECV_ATTR_STR(TLS_ATTR_SRVR_SIG_NAME, srvr_sig_name),
RECV_ATTR_STR(TLS_ATTR_SRVR_SIG_CURVE, srvr_sig_curve),
RECV_ATTR_INT(TLS_ATTR_SRVR_SIG_BITS, &tls_context->srvr_sig_bits),
RECV_ATTR_STR(TLS_ATTR_SRVR_SIG_DGST, srvr_sig_dgst),
RECV_ATTR_STR(TLS_ATTR_NAMADDR, namaddr),
ATTR_TYPE_END);
/* Always construct a well-formed structure. */
tls_context->peer_CN = vstring_export(peer_CN);
tls_context->issuer_CN = vstring_export(issuer_CN);
tls_context->peer_cert_fprint = vstring_export(peer_cert_fprint);
tls_context->peer_pkey_fprint = vstring_export(peer_pkey_fprint);
tls_context->protocol = vstring_export(protocol);
tls_context->cipher_name = vstring_export(cipher_name);
tls_context->kex_name = vstring_export(kex_name);
tls_context->kex_curve = vstring_export(kex_curve);
tls_context->clnt_sig_name = vstring_export(clnt_sig_name);
tls_context->clnt_sig_curve = vstring_export(clnt_sig_curve);
tls_context->clnt_sig_dgst = vstring_export(clnt_sig_dgst);
tls_context->srvr_sig_name = vstring_export(srvr_sig_name);
tls_context->srvr_sig_curve = vstring_export(srvr_sig_curve);
tls_context->srvr_sig_dgst = vstring_export(srvr_sig_dgst);
tls_context->namaddr = vstring_export(namaddr);
ret = (ret == 22 ? 1 : -1);
if (ret != 1) {
tls_proxy_context_free(tls_context);
tls_context = 0;
}
*(TLS_SESS_STATE **) ptr = tls_context;
if (msg_verbose)
msg_info("tls_proxy_context_scan ret=%d", ret);
return (ret);
}
/* tls_proxy_context_free - destroy object from tls_proxy_context_receive() */
void tls_proxy_context_free(TLS_SESS_STATE *tls_context)
{
if (tls_context->peer_CN)
myfree(tls_context->peer_CN);
if (tls_context->issuer_CN)
myfree(tls_context->issuer_CN);
if (tls_context->peer_cert_fprint)
myfree(tls_context->peer_cert_fprint);
if (tls_context->peer_pkey_fprint)
myfree(tls_context->peer_pkey_fprint);
if (tls_context->protocol)
myfree((void *) tls_context->protocol);
if (tls_context->cipher_name)
myfree((void *) tls_context->cipher_name);
if (tls_context->kex_name)
myfree((void *) tls_context->kex_name);
if (tls_context->kex_curve)
myfree((void *) tls_context->kex_curve);
if (tls_context->clnt_sig_name)
myfree((void *) tls_context->clnt_sig_name);
if (tls_context->clnt_sig_curve)
myfree((void *) tls_context->clnt_sig_curve);
if (tls_context->clnt_sig_dgst)
myfree((void *) tls_context->clnt_sig_dgst);
if (tls_context->srvr_sig_name)
myfree((void *) tls_context->srvr_sig_name);
if (tls_context->srvr_sig_curve)
myfree((void *) tls_context->srvr_sig_curve);
if (tls_context->srvr_sig_dgst)
myfree((void *) tls_context->srvr_sig_dgst);
if (tls_context->namaddr)
myfree((void *) tls_context->namaddr);
myfree((void *) tls_context);
}
#endif
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