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/*
* cb.c
*
* Version: $Id$
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*
* Copyright 2001 hereUare Communications, Inc. <raghud@hereuare.com>
* Copyright 2006 The FreeRADIUS server project
*/
RCSID("$Id$")
USES_APPLE_DEPRECATED_API /* OpenSSL API has been deprecated by Apple */
#include <freeradius-devel/radiusd.h>
#ifdef WITH_TLS
void cbtls_info(SSL const *s, int where, int ret)
{
char const *role, *state;
REQUEST *request = SSL_get_ex_data(s, FR_TLS_EX_INDEX_REQUEST);
if ((where & ~SSL_ST_MASK) & SSL_ST_CONNECT) {
role = "Client ";
} else if (((where & ~SSL_ST_MASK)) & SSL_ST_ACCEPT) {
role = "Server ";
} else {
role = "";
}
state = SSL_state_string_long(s);
state = state ? state : "<none>";
if ((where & SSL_CB_LOOP) || (where & SSL_CB_HANDSHAKE_START) || (where & SSL_CB_HANDSHAKE_DONE)) {
if (RDEBUG_ENABLED3) {
char const *abbrv = SSL_state_string(s);
size_t len;
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
STACK_OF(SSL_CIPHER) *client_ciphers;
STACK_OF(SSL_CIPHER) *server_ciphers;
#endif
/*
* Trim crappy OpenSSL state strings...
*/
len = strlen(abbrv);
if ((len > 1) && (abbrv[len - 1] == ' ')) len--;
RDEBUG3("(TLS) Handshake state [%.*s] - %s%s (%d)",
(int)len, abbrv, role, state, SSL_get_state(s));
/*
* After a ClientHello, list all the proposed ciphers from the client
*/
#if OPENSSL_VERSION_NUMBER >= 0x10100000L
if (SSL_get_state(s) == TLS_ST_SR_CLNT_HELLO) {
int i;
int num_ciphers;
const SSL_CIPHER *this_cipher;
server_ciphers = SSL_get_ciphers(s);
if (server_ciphers) {
RDEBUG3("Server preferred ciphers (by priority)");
num_ciphers = sk_SSL_CIPHER_num(server_ciphers);
for (i = 0; i < num_ciphers; i++) {
this_cipher = sk_SSL_CIPHER_value(server_ciphers, i);
RDEBUG3("(TLS) [%i] %s", i, SSL_CIPHER_get_name(this_cipher));
}
}
client_ciphers = SSL_get_client_ciphers(s);
if (client_ciphers) {
RDEBUG3("Client preferred ciphers (by priority)");
num_ciphers = sk_SSL_CIPHER_num(client_ciphers);
for (i = 0; i < num_ciphers; i++) {
this_cipher = sk_SSL_CIPHER_value(client_ciphers, i);
RDEBUG3("(TLS) [%i] %s", i, SSL_CIPHER_get_name(this_cipher));
}
}
}
#endif
} else {
RDEBUG2("(TLS) Handshake state - %s%s", role, state);
}
return;
}
if (where & SSL_CB_ALERT) {
if ((ret & 0xff) == SSL_AD_CLOSE_NOTIFY) return;
RERROR("(TLS) Alert %s:%s:%s", (where & SSL_CB_READ) ? "read": "write",
SSL_alert_type_string_long(ret), SSL_alert_desc_string_long(ret));
return;
}
if (where & SSL_CB_EXIT) {
if (ret == 0) {
RERROR("(TLS) %s: Failed in %s", role, state);
return;
}
if (ret < 0) {
if (SSL_want_read(s)) {
RDEBUG2("(TLS) %s: Need to read more data: %s", role, state);
return;
}
RERROR("(TLS) %s: Error in %s", role, state);
}
}
}
/*
* Fill in our 'info' with TLS data.
*/
void cbtls_msg(int write_p, int msg_version, int content_type,
void const *inbuf, size_t len,
SSL *ssl UNUSED, void *arg)
{
uint8_t const *buf = inbuf;
tls_session_t *state = (tls_session_t *)arg;
/*
* OpenSSL 1.0.2 calls this function with 'pseudo'
* content types. Which breaks our tracking of
* the SSL Session state.
*/
#if OPENSSL_VERSION_NUMBER < 0x30000000L
if ((msg_version == 0) && (content_type > UINT8_MAX)) {
#else
/*
* "...we do not see the need to resolve application breakage
* just because the documentation now is incorrect."
*
* https://github.com/openssl/openssl/issues/17262
*/
if ((content_type > UINT8_MAX) && (content_type != SSL3_RT_INNER_CONTENT_TYPE)) {
#endif
DEBUG4("(TLS) Ignoring cbtls_msg call with pseudo content type %i, version %08x",
content_type, msg_version);
return;
}
if ((write_p != 0) && (write_p != 1)) {
DEBUG4("(TLS) Ignoring cbtls_msg call with invalid write_p %d", write_p);
return;
}
/*
* Work around bug #298, where we may be called with a NULL
* argument. We should really log a serious error
*/
if (!state) return;
if (rad_debug_lvl > 3) {
size_t i, j, data_len = len;
char buffer[3*16 + 1];
uint8_t const *in = inbuf;
DEBUG("(TLS) Received %zu bytes of TLS data", len);
if (data_len > 256) data_len = 256;
for (i = 0; i < data_len; i += 16) {
for (j = 0; j < 16; j++) {
if ((i + j) >= data_len) break;
sprintf(buffer + 3 * j, "%02x ", in[i + j]);
}
DEBUG("(TLS) %s", buffer);
}
}
/*
* 0 - received (from peer)
* 1 - sending (to peer)
*/
state->info.origin = write_p;
state->info.content_type = content_type;
state->info.record_len = len;
state->info.initialized = true;
if (content_type == SSL3_RT_ALERT) {
state->info.alert_level = buf[0];
state->info.alert_description = buf[1];
state->info.handshake_type = 0x00;
} else if (content_type == SSL3_RT_HANDSHAKE) {
state->info.handshake_type = buf[0];
state->info.alert_level = 0x00;
state->info.alert_description = 0x00;
#if OPENSSL_VERSION_NUMBER >= 0x10101000L
} else if (content_type == SSL3_RT_INNER_CONTENT_TYPE && buf[0] == SSL3_RT_APPLICATION_DATA) {
/* let tls_ack_handler set application_data */
state->info.content_type = SSL3_RT_HANDSHAKE;
#endif
#ifdef SSL3_RT_HEARTBEAT
} else if (content_type == TLS1_RT_HEARTBEAT) {
uint8_t *p = buf;
if ((len >= 3) && (p[0] == 1)) {
size_t payload_len;
payload_len = (p[1] << 8) | p[2];
if ((payload_len + 3) > len) {
state->invalid_hb_used = true;
ERROR("OpenSSL Heartbeat attack detected. Closing connection");
return;
}
}
#endif
}
tls_session_information(state);
}
int cbtls_password(char *buf,
int num,
int rwflag UNUSED,
void *userdata)
{
size_t len;
len = strlcpy(buf, (char *)userdata, num);
if (len >= (size_t) num) {
ERROR("Password too long. Maximum length is %i bytes", num - 1);
return 0;
}
return len;
}
#endif
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