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/*
* Copyright (C) 2000,2001 Nikos Mavroyanopoulos
*
* This file is part of GNUTLS.
*
* GNUTLS 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.
*
* GNUTLS 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <string.h>
#include <unistd.h>
#include "../lib/gnutls.h"
#include <common.h>
#include <signal.h>
#define KEYFILE "x509/key.pem"
#define CERTFILE "x509/cert.pem"
#define CAFILE "x509/ca.pem"
#define CRLFILE NULL
#define SRP_PASSWD "srp/tpasswd"
#define SRP_PASSWD_CONF "srp/tpasswd.conf"
/* konqueror cannot handle sending the page in multiple
* pieces.
*/
static char http_buffer[16*1024];
/* This is a sample TCP echo server.
* This will behave as an http server if any argument in the
* command line is present
*/
#define SA struct sockaddr
#define ERR(err,s) if(err==-1) {perror(s);return(1);}
#define MAX_BUF 1024
#define HTTP_BEGIN "HTTP/1.0 200 OK\n" \
"Content-Type: text/html\n" \
"\n" \
"<HTML><BODY>\n" \
"<CENTER><H1>This is <a href=\"http://www.gnu.org/software/gnutls\">" \
"GNUTLS</a></H1>\n\n"
#define HTTP_END "</BODY></HTML>\n\n"
#define RENEGOTIATE
/* These are global */
SRP_SERVER_CREDENTIALS srp_cred;
ANON_SERVER_CREDENTIALS dh_cred;
X509PKI_SERVER_CREDENTIALS x509_cred;
GNUTLS_STATE initialize_state()
{
GNUTLS_STATE state;
int ret;
gnutls_init(&state, GNUTLS_SERVER);
if ((ret = gnutls_set_db_name(state, "gnutls-rsm.db")) < 0)
fprintf(stderr, "*** DB error (%d). Resuming will not be possible.\n\n", ret);
/* null cipher is here only for debuging
* purposes.
*/
gnutls_set_cipher_priority(state, GNUTLS_NULL_CIPHER,
GNUTLS_RIJNDAEL_CBC, GNUTLS_3DES_CBC, GNUTLS_ARCFOUR, 0);
gnutls_set_compression_priority(state, GNUTLS_ZLIB, GNUTLS_NULL_COMPRESSION, 0);
gnutls_set_kx_priority(state, GNUTLS_KX_RSA, GNUTLS_KX_DHE_RSA, GNUTLS_KX_SRP, GNUTLS_KX_DH_ANON, 0);
gnutls_set_protocol_priority( state, GNUTLS_TLS1, GNUTLS_SSL3, 0);
gnutls_set_cred(state, GNUTLS_ANON, dh_cred);
gnutls_set_cred(state, GNUTLS_SRP, srp_cred);
gnutls_set_cred(state, GNUTLS_X509PKI, x509_cred);
gnutls_set_mac_priority(state, GNUTLS_MAC_SHA, GNUTLS_MAC_MD5, 0);
gnutls_x509pki_set_cert_request( state, GNUTLS_CERT_REQUEST);
return state;
}
void print_info(GNUTLS_STATE state)
{
const char *tmp;
unsigned char sesid[32];
int sesid_size, i;
gnutls_DN dn;
CredType cred;
CertificateStatus status;
char dnsname[512];
int dnsname_size;
/* print session_id specific data */
gnutls_get_current_session_id( state, sesid, &sesid_size);
printf("\n- Session ID: ");
for(i=0;i<sesid_size;i++)
printf("%.2X", sesid[i]);
printf("\n");
if ( gnutls_ext_get_name_ind(state, GNUTLS_DNSNAME) != NULL) {
printf("- DNSNAME: ");
printf("%s\n", (char*)gnutls_ext_get_name_ind(state, GNUTLS_DNSNAME));
}
/* we could also use the KX algorithm to distinguish the functions
* to call, but this is easier.
*/
cred = gnutls_get_auth_type(state);
switch(cred) {
case GNUTLS_SRP:
/* print srp specific data */
printf("\n- User '%s' connected\n",
gnutls_srp_server_get_username( state));
break;
case GNUTLS_ANON:
printf("\n- Anonymous DH using prime of %d bits\n",
gnutls_anon_server_get_dh_bits( state));
break;
case GNUTLS_X509PKI:
status = gnutls_x509pki_client_get_peer_certificate_status( state);
switch( status) {
case GNUTLS_CERT_NOT_TRUSTED:
printf("- Peer's X509 Certificate was NOT verified\n");
break;
case GNUTLS_CERT_EXPIRED:
printf("- Peer's X509 Certificate was verified but is expired\n");
break;
case GNUTLS_CERT_TRUSTED:
printf("- Peer's X509 Certificate was verified\n");
break;
case GNUTLS_CERT_NONE:
printf("- Peer did not send any certificate.\n");
break;
case GNUTLS_CERT_INVALID:
printf("- Peer's X509 Certificate was invalid\n");
break;
}
if (gnutls_get_current_kx(state) == GNUTLS_KX_DHE_RSA || gnutls_get_current_kx(state) == GNUTLS_KX_DHE_DSS) {
printf("\n- Ephemeral DH using prime of %d bits\n",
gnutls_x509pki_server_get_dh_bits( state));
}
if (status!=GNUTLS_CERT_NONE && status!=GNUTLS_CERT_INVALID) {
printf(" - Certificate info:\n");
printf(" - Certificate version: #%d\n", gnutls_x509pki_client_get_peer_certificate_version(state));
if (gnutls_x509pki_client_get_peer_dn( state, &dn) > 0) {
PRINT_DN( dn);
}
if (gnutls_x509pki_client_get_issuer_dn( state, &dn) > 0) {
printf(" - Certificate Issuer's info:\n");
PRINT_DN( dn);
}
}
}
/* print state information */
tmp = gnutls_version_get_name(gnutls_get_current_version(state));
printf("- Version: %s\n", tmp);
tmp = gnutls_kx_get_name(gnutls_get_current_kx(state));
printf("- Key Exchange: %s\n", tmp);
tmp =
gnutls_compression_get_name
(gnutls_get_current_compression_method(state));
printf("- Compression: %s\n", tmp);
tmp = gnutls_cipher_get_name(gnutls_get_current_cipher(state));
printf("- Cipher: %s\n", tmp);
tmp = gnutls_mac_get_name(gnutls_get_current_mac_algorithm(state));
printf("- MAC: %s\n", tmp);
}
/* Creates html with the current state information.
*/
#define tmp2 &http_buffer[strlen(http_buffer)]
void peer_print_info( GNUTLS_STATE state)
{
const char *tmp;
unsigned char sesid[32];
int sesid_size, i;
/* print session_id */
gnutls_get_current_session_id( state, sesid, &sesid_size);
sprintf(tmp2, "\n<p>Session ID: <i>");
for(i=0;i<sesid_size;i++)
sprintf(tmp2, "%.2X", sesid[i]);
sprintf(tmp2, "</i></p>\n");
/* if the client supports dnsname extension then
* print the hostname he connected to.
*/
if (gnutls_ext_get_name_ind(state, GNUTLS_DNSNAME)!=NULL) {
sprintf(tmp2, "\n<p>DNSNAME: ");
sprintf(tmp2, "<b>%s</b></p>\n", (char*)gnutls_ext_get_name_ind(state, GNUTLS_DNSNAME));
}
/* Here unlike print_info() we use the kx algorithm to distinguish
* the functions to call.
*/
/* print srp specific data */
if (gnutls_get_current_kx(state) == GNUTLS_KX_SRP) {
sprintf(tmp2, "<p>Connected as user '%s'.</p>\n",
gnutls_srp_server_get_username( state));
}
if (gnutls_get_current_kx(state) == GNUTLS_KX_DH_ANON) {
sprintf(tmp2, "<p> Connect using anonymous DH (prime of %d bits)</p>\n",
gnutls_anon_server_get_dh_bits( state));
}
/* print state information */
strcat( http_buffer, "<P>\n");
tmp = gnutls_version_get_name(gnutls_get_current_version(state));
sprintf(tmp2, "Protocol version: <b>%s</b><br>\n", tmp);
tmp = gnutls_kx_get_name(gnutls_get_current_kx(state));
sprintf(tmp2, "Key Exchange: <b>%s</b><br>\n", tmp);
if (gnutls_get_current_kx(state) == GNUTLS_KX_DHE_RSA || gnutls_get_current_kx(state) == GNUTLS_KX_DHE_DSS) {
sprintf(tmp2, "Ephemeral DH using prime of <b>%d</b> bits.<br>\n",
gnutls_x509pki_server_get_dh_bits( state));
}
tmp =
gnutls_compression_get_name
(gnutls_get_current_compression_method(state));
sprintf(tmp2, "Compression: <b>%s</b><br>\n", tmp);
tmp = gnutls_cipher_get_name(gnutls_get_current_cipher(state));
sprintf(tmp2, "Cipher: <b>%s</b><br>\n", tmp);
tmp = gnutls_mac_get_name(gnutls_get_current_mac_algorithm(state));
sprintf(tmp2, "MAC: <b>%s</b><br>\n", tmp);
strcat( http_buffer, "</P>\n");
return;
}
/* actually something like readline.
* if rnl!=1 then reads an http request in the form REQ\n\n
*/
int read_request( GNUTLS_STATE state, char *data, int data_size, int rnl)
{
int n, rc, nl = 0;
char c, *ptr, p1=0, p2=0;
ptr = data;
for (n = 1; n < data_size; n++) {
do {
rc = gnutls_read( state, &c, 1);
} while( rc==GNUTLS_E_INTERRUPTED || rc==GNUTLS_E_AGAIN);
if ( rc == 1) {
*ptr++ = c;
if (c == '\n' && rnl==1) break;
if (c=='\n' && p1=='\r' && p2=='\n') {
nl++;
if (nl == 1)
break;
}
p2 = p1;
p1 = c;
} else if (rc == 0) {
if (n == 1)
return 0;
else
break;
} else {
return rc;
}
}
*ptr = 0;
return n;
}
void check_alert( GNUTLS_STATE state, int ret) {
if (ret == GNUTLS_E_WARNING_ALERT_RECEIVED || ret == GNUTLS_E_FATAL_ALERT_RECEIVED) {
ret = gnutls_get_last_alert(state);
if (ret == GNUTLS_NO_RENEGOTIATION)
printf("* Received NO_RENEGOTIATION alert. Client Does not support renegotiation.\n");
else
printf("* Received alert '%d'.\n", ret);
}
}
int main(int argc, char **argv)
{
int err, listen_sd, i;
int sd, ret;
struct sockaddr_in sa_serv;
struct sockaddr_in sa_cli;
int client_len;
char topbuf[512];
GNUTLS_STATE state;
char buffer[MAX_BUF + 1];
int optval = 1;
int http = 0;
char name[256];
signal(SIGPIPE, SIG_IGN);
if (argc != 2) {
fprintf(stderr, "Usage: serv [-e] [-h]\n");
exit(1);
} else {
if (argv[1][strlen(argv[1])-1]=='h') {
http = 1;
strcpy(name, "HTTP Server");
} else {
strcpy(name, "Echo Server");
}
}
if (gnutls_global_init() < 0) {
fprintf(stderr, "global state initialization error\n");
exit(1);
}
if (gnutls_allocate_x509_server_sc(&x509_cred, 1) < 0) {
fprintf(stderr, "memory error\n");
exit(1);
}
if (gnutls_set_x509_server_trust( x509_cred, CAFILE, CRLFILE) < 0) {
fprintf(stderr, "X509 PARSE ERROR\nDid you have ca.pem?\n");
exit(1);
}
if (gnutls_set_x509_server_key( x509_cred, CERTFILE, KEYFILE) < 0) {
fprintf(stderr, "X509 PARSE ERROR\nDid you have key.pem and cert.pem?\n");
exit(1);
}
/* this is a password file (created with the included srpcrypt utility)
* Read README.crypt prior to using SRP.
*/
gnutls_allocate_srp_server_sc( &srp_cred);
gnutls_set_srp_server_cred( srp_cred, SRP_PASSWD, SRP_PASSWD_CONF);
gnutls_allocate_anon_server_sc( &dh_cred);
gnutls_set_anon_server_cred( dh_cred, 1024);
listen_sd = socket(AF_INET, SOCK_STREAM, 0);
ERR(listen_sd, "socket");
memset(&sa_serv, '\0', sizeof(sa_serv));
sa_serv.sin_family = AF_INET;
sa_serv.sin_addr.s_addr = INADDR_ANY;
sa_serv.sin_port = htons(PORT); /* Server Port number */
setsockopt(listen_sd, SOL_SOCKET, SO_REUSEADDR, &optval,
sizeof(int));
err = bind(listen_sd, (SA *) & sa_serv, sizeof(sa_serv));
ERR(err, "bind");
err = listen(listen_sd, 1024);
ERR(err, "listen");
printf("%s ready. Listening to port '%d'.\n\n", name, PORT);
client_len = sizeof(sa_cli);
for (;;) {
state = initialize_state();
sd = accept(listen_sd, (SA *) & sa_cli, &client_len);
printf("- connection from %s, port %d\n",
inet_ntop(AF_INET, &sa_cli.sin_addr, topbuf,
sizeof(topbuf)), ntohs(sa_cli.sin_port));
gnutls_set_transport_ptr( state, sd);
do {
ret = gnutls_handshake( state);
} while( ret==GNUTLS_E_INTERRUPTED || ret==GNUTLS_E_AGAIN);
if (ret < 0) {
close(sd);
gnutls_deinit(state);
fprintf(stderr, "*** Handshake has failed (%s)\n\n",
gnutls_strerror(ret));
check_alert( state, ret);
continue;
}
printf("- Handshake was completed\n");
print_info(state);
i = 0;
for (;;) {
bzero(buffer, MAX_BUF + 1);
ret = read_request( state, buffer, MAX_BUF, (http==0)?1:2);
if (gnutls_is_fatal_error(ret) == 1 || ret == 0) {
fflush(stdout);
if (ret == 0) {
printf
("\n- Peer has closed the GNUTLS connection\n");
fflush(stdout);
break;
} else {
fprintf(stderr,
"\n*** Received corrupted data(%d). Closing the connection.\n\n",
ret);
break;
}
}
if (ret > 0) {
if (http == 0) {
printf( "* Read %d bytes from client.\n", strlen(buffer));
do {
ret = gnutls_write( state, buffer, strlen(buffer));
} while( ret==GNUTLS_E_INTERRUPTED || ret==GNUTLS_E_AGAIN);
printf( "* Wrote %d bytes to client.\n", ret);
} else {
strcpy( http_buffer, HTTP_BEGIN);
peer_print_info( state);
strcat( http_buffer, HTTP_END);
do {
ret = gnutls_write( state, http_buffer, strlen(http_buffer));
} while( ret==GNUTLS_E_INTERRUPTED || ret==GNUTLS_E_AGAIN);
printf("- Served request. Closing connection.\n");
break;
}
}
i++;
#ifdef RENEGOTIATE
if (i == 20) {
do {
ret = gnutls_rehandshake( state);
} while( ret==GNUTLS_E_INTERRUPTED || ret==GNUTLS_E_AGAIN);
if (gnutls_get_last_alert(state)!=GNUTLS_NO_RENEGOTIATION) {
printf("* Requesting rehandshake.\n");
/* continue handshake proccess */
do {
ret = gnutls_handshake( state);
} while( ret==GNUTLS_E_INTERRUPTED || ret==GNUTLS_E_AGAIN);
printf("* Rehandshake returned %d\n", ret);
}
}
#endif
check_alert( state, ret);
if (http != 0) {
break; /* close the connection */
}
}
printf("\n");
do {
ret = gnutls_bye( state, GNUTLS_SHUT_WR);
} while( ret==GNUTLS_E_INTERRUPTED || ret==GNUTLS_E_AGAIN);
/* do not wait for
* the peer to close the connection.
*/
close(sd);
gnutls_deinit(state);
}
close(listen_sd);
gnutls_free_x509_server_sc(x509_cred);
gnutls_free_srp_server_sc(srp_cred);
gnutls_free_anon_server_sc(dh_cred);
gnutls_global_deinit();
return 0;
}
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