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-rw-r--r--src/tls/tls_proxy_context_scan.c190
1 files changed, 190 insertions, 0 deletions
diff --git a/src/tls/tls_proxy_context_scan.c b/src/tls/tls_proxy_context_scan.c
new file mode 100644
index 0000000..1d463ad
--- /dev/null
+++ b/src/tls/tls_proxy_context_scan.c
@@ -0,0 +1,190 @@
+/*++
+/* 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