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|
/*
* Copyright (C) 2000,2001,2002 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>
#include "serv-gaa.h"
/* konqueror cannot handle sending the page in multiple
* pieces.
*/
/* global stuff */
static char http_buffer[16 * 1024];
static int generate = 0;
static int http = 0;
static int port = 0;
static int x509ctype;
char *srp_passwd;
char *srp_passwd_conf;
char *pgp_keyring;
char *pgp_trustdb;
char *pgp_keyserver;
char *pgp_keyfile;
char *pgp_certfile;
char *x509_keyfile;
char *x509_certfile;
char *x509_cafile;
char *x509_crlfile = NULL;
/* end of globals */
/* 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 */
GNUTLS_SRP_SERVER_CREDENTIALS srp_cred;
GNUTLS_ANON_SERVER_CREDENTIALS dh_cred;
GNUTLS_CERTIFICATE_SERVER_CREDENTIALS cert_cred;
#define DEFAULT_PRIME_BITS 1024
/* we use primes up to 1024 in this server.
* otherwise we should add them here.
*/
static int prime_nums[] = { 768, 1024, 0 };
GNUTLS_DH_PARAMS dh_params;
static int generate_dh_primes(void)
{
gnutls_datum prime, generator;
int i = 0;
if (gnutls_dh_params_init(&dh_params) < 0) {
fprintf(stderr, "Error in dh parameter initialization\n");
exit(1);
}
do {
/* Generate Diffie Hellman parameters - for use with DHE
* kx algorithms. These should be discarded and regenerated
* once a day, once a week or once a month. Depends on the
* security requirements.
*/
printf
("Generating Diffie Hellman parameters [%d]. Please wait...",
prime_nums[i]);
fflush(stdout);
if (gnutls_dh_params_generate(&prime, &generator, prime_nums[i]) < 0) {
fprintf(stderr, "Error in prime generation\n");
exit(1);
}
if (gnutls_dh_params_set
(dh_params, prime, generator, prime_nums[i]) < 0) {
fprintf(stderr, "Error in prime replacement\n");
exit(1);
}
free(prime.data);
free(generator.data);
} while (prime_nums[++i] != 0);
return 0;
}
int protocol_priority[16] = { GNUTLS_TLS1, GNUTLS_SSL3, 0 };
int kx_priority[16] =
{ GNUTLS_KX_DHE_DSS, GNUTLS_KX_RSA, GNUTLS_KX_DHE_RSA, GNUTLS_KX_SRP,
GNUTLS_KX_ANON_DH, 0
};
int cipher_priority[16] =
{ GNUTLS_CIPHER_RIJNDAEL_128_CBC, GNUTLS_CIPHER_3DES_CBC,
GNUTLS_CIPHER_ARCFOUR, 0
};
int comp_priority[16] = { GNUTLS_COMP_ZLIB, GNUTLS_COMP_NULL, 0 };
int mac_priority[16] = { GNUTLS_MAC_SHA, GNUTLS_MAC_MD5, 0 };
int cert_type_priority[16] = { GNUTLS_CRT_X509, GNUTLS_CRT_OPENPGP, 0 };
GNUTLS_STATE initialize_state(void)
{
GNUTLS_STATE state;
int ret;
gnutls_init(&state, GNUTLS_SERVER);
if ((ret = gnutls_db_set_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_cipher_set_priority(state, cipher_priority);
gnutls_compression_set_priority(state, comp_priority);
gnutls_kx_set_priority(state, kx_priority);
gnutls_protocol_set_priority(state, protocol_priority);
gnutls_mac_set_priority(state, mac_priority);
gnutls_cert_type_set_priority(state, cert_type_priority);
gnutls_dh_set_prime_bits(state, DEFAULT_PRIME_BITS);
gnutls_cred_set(state, GNUTLS_CRD_ANON, dh_cred);
gnutls_cred_set(state, GNUTLS_CRD_SRP, srp_cred);
gnutls_cred_set(state, GNUTLS_CRD_CERTIFICATE, cert_cred);
gnutls_mac_set_priority(state, mac_priority);
gnutls_certificate_server_set_request(state, GNUTLS_CERT_REQUEST);
return state;
}
/* 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_session_get_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");
/* Here unlike print_info() we use the kx algorithm to distinguish
* the functions to call.
*/
/* print srp specific data */
if (gnutls_kx_get(state) == GNUTLS_KX_SRP) {
sprintf(tmp2, "<p>Connected as user '%s'.</p>\n",
gnutls_srp_server_get_username(state));
}
if (gnutls_kx_get(state) == GNUTLS_KX_ANON_DH) {
sprintf(tmp2,
"<p> Connect using anonymous DH (prime of %d bits)</p>\n",
gnutls_dh_get_prime_bits(state));
}
/* print state information */
strcat(http_buffer, "<P>\n");
tmp = gnutls_protocol_get_name(gnutls_protocol_get_version(state));
sprintf(tmp2, "Protocol version: <b>%s</b><br>\n", tmp);
if (gnutls_auth_get_type(state) == GNUTLS_CRD_CERTIFICATE) {
tmp = gnutls_cert_type_get_name(gnutls_cert_type_get(state));
sprintf(tmp2, "Certificate Type: <b>%s</b><br>\n", tmp);
}
tmp = gnutls_kx_get_name(gnutls_kx_get(state));
sprintf(tmp2, "Key Exchange: <b>%s</b><br>\n", tmp);
if (gnutls_kx_get(state) == GNUTLS_KX_DHE_RSA
|| gnutls_kx_get(state) == GNUTLS_KX_DHE_DSS) {
sprintf(tmp2,
"Ephemeral DH using prime of <b>%d</b> bits.<br>\n",
gnutls_dh_get_prime_bits(state));
}
tmp = gnutls_compression_get_name(gnutls_compression_get(state));
sprintf(tmp2, "Compression: <b>%s</b><br>\n", tmp);
tmp = gnutls_cipher_get_name(gnutls_cipher_get(state));
sprintf(tmp2, "Cipher: <b>%s</b><br>\n", tmp);
tmp = gnutls_mac_get_name(gnutls_mac_get(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_record_recv(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)
{
int last_alert;
if (ret == GNUTLS_E_WARNING_ALERT_RECEIVED
|| ret == GNUTLS_E_FATAL_ALERT_RECEIVED) {
last_alert = gnutls_alert_get(state);
if (last_alert == GNUTLS_A_NO_RENEGOTIATION &&
ret == GNUTLS_E_WARNING_ALERT_RECEIVED)
printf
("* Received NO_RENEGOTIATION alert. Client Does not support renegotiation.\n");
else
printf("* Received alert '%d'.\n", ret);
}
}
static void gaa_parser(int argc, char **argv);
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;
char name[256];
signal(SIGPIPE, SIG_IGN);
gaa_parser(argc, argv);
if (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);
}
/* Note that servers must generate parameters for
* Diffie Hellman. See gnutls_dh_params_generate(), and
* gnutls_dh_params_set().
*/
if (generate != 0)
generate_dh_primes();
if (gnutls_certificate_allocate_sc(&cert_cred) < 0) {
fprintf(stderr, "memory error\n");
exit(1);
}
if (x509_cafile != NULL) {
if ((ret=gnutls_certificate_set_x509_trust_file
(cert_cred, x509_cafile, x509ctype)) < 0) {
fprintf(stderr, "Error reading '%s'\n", x509_cafile);
exit(1);
} else {
printf("Processed %d CA certificate(s).\n", ret);
}
}
if (pgp_keyring != NULL) {
ret =
gnutls_certificate_set_openpgp_keyring_file(cert_cred, pgp_keyring);
if (ret < 0) {
fprintf(stderr, "Error setting the OpenPGP keyring file\n");
}
}
if (pgp_trustdb != NULL) {
gnutls_certificate_set_openpgp_trustdb(cert_cred, pgp_trustdb);
}
if (pgp_certfile != NULL)
if (gnutls_certificate_set_openpgp_key_file
(cert_cred, pgp_certfile, pgp_keyfile) < 0) {
fprintf(stderr,
"Error while reading the OpenPGP key pair ('%s', '%s')\n",
pgp_certfile, pgp_keyfile);
}
gnutls_certificate_set_openpgp_keyserver(cert_cred, pgp_keyserver, 0);
if (x509_certfile != NULL)
if (gnutls_certificate_set_x509_key_file
(cert_cred, x509_certfile, x509_keyfile, x509ctype) < 0) {
fprintf(stderr,
"Error reading '%s' or '%s'\n", x509_certfile,
x509_keyfile);
exit(1);
}
if (generate != 0)
if (gnutls_certificate_set_dh_params(cert_cred, dh_params) < 0) {
fprintf(stderr, "Error while setting DH parameters\n");
exit(1);
}
/* this is a password file (created with the included srpcrypt utility)
* Read README.crypt prior to using SRP.
*/
gnutls_srp_allocate_server_sc(&srp_cred);
if (srp_passwd!=NULL)
if ((ret=gnutls_srp_set_server_cred_file(srp_cred, srp_passwd, srp_passwd_conf)) < 0) {
/* only exit is this function is not disabled
*/
fprintf(stderr, "Error while setting SRP parameters\n");
}
gnutls_anon_allocate_server_sc(&dh_cred);
if (generate != 0)
gnutls_anon_set_server_dh_params(dh_cred, dh_params);
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_transport_set_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");
if ( gnutls_session_is_resumed( state)!=0)
printf("*** This is a resumed session\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_error_is_fatal(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_record_send(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_record_send(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);
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_certificate_free_sc(cert_cred);
gnutls_srp_free_server_sc(srp_cred);
gnutls_anon_free_server_sc(dh_cred);
gnutls_global_deinit();
return 0;
}
#define DEFAULT_X509_KEYFILE "x509/key.pem"
#define DEFAULT_X509_CERTFILE "x509/cert.pem"
#define DEFAULT_X509_KEYFILE2 "x509/key-dsa.pem"
#define DEFAULT_X509_CERTFILE2 "x509/cert-dsa.pem"
#define DEFAULT_PGP_KEYFILE "openpgp/sec.asc"
#define DEFAULT_PGP_CERTFILE "openpgp/pub.asc"
#define DEFAULT_X509_CAFILE "x509/ca.pem"
#define DEFAULT_X509_CRLFILE NULL;
#define DEFAULT_SRP_PASSWD "srp/tpasswd"
#define DEFAULT_SRP_PASSWD_CONF "srp/tpasswd.conf"
#undef DEBUG
static gaainfo info;
void gaa_parser(int argc, char **argv)
{
int i, j;
if (gaa(argc, argv, &info) != -1) {
fprintf(stderr,
"Error in the arguments. Use the --help or -h parameters to get more information.\n");
exit(1);
}
if (info.http == 0)
http = 0;
else
http = 1;
if (info.fmtder == 0)
x509ctype = GNUTLS_X509_FMT_PEM;
else
x509ctype = GNUTLS_X509_FMT_DER;
if (info.generate == 0)
generate = 0;
else
generate = 1;
port = info.port;
#ifdef DEBUG
if (info.x509_certfile != NULL)
x509_certfile = info.x509_certfile;
else
x509_certfile = DEFAULT_X509_CERTFILE;
if (info.x509_keyfile != NULL)
x509_keyfile = info.x509_keyfile;
else
x509_keyfile = DEFAULT_X509_KEYFILE;
if (info.x509_cafile != NULL)
x509_cafile = info.x509_certfile;
else
x509_cafile = DEFAULT_X509_CAFILE;
if (info.pgp_certfile != NULL)
pgp_certfile = info.pgp_certfile;
else
pgp_certfile = DEFAULT_PGP_CERTFILE;
if (info.pgp_keyfile != NULL)
pgp_keyfile = info.pgp_keyfile;
else
pgp_keyfile = DEFAULT_PGP_KEYFILE;
if (info.srp_passwd != NULL)
srp_passwd = info.srp_passwd;
else
srp_passwd = DEFAULT_SRP_PASSWD;
if (info.srp_passwd_conf != NULL)
srp_passwd_conf = info.srp_passwd_conf;
else
srp_passwd_conf = DEFAULT_SRP_PASSWD_CONF;
#else
x509_certfile = info.x509_certfile;
x509_keyfile = info.x509_keyfile;
x509_cafile = info.x509_cafile;
pgp_certfile = info.pgp_certfile;
pgp_keyfile = info.pgp_keyfile;
srp_passwd = info.srp_passwd;
srp_passwd_conf = info.srp_passwd_conf;
#endif
pgp_keyserver = info.pgp_keyserver;
pgp_keyring = info.pgp_keyring;
pgp_trustdb = info.pgp_trustdb;
if (info.proto != NULL && info.nproto > 0) {
for (j = i = 0; i < info.nproto; i++) {
if (strncasecmp(info.proto[i], "SSL", 3) == 0)
protocol_priority[j++] = GNUTLS_SSL3;
if (strncasecmp(info.proto[i], "TLS", 3) == 0)
protocol_priority[j++] = GNUTLS_TLS1;
}
protocol_priority[j] = 0;
}
if (info.ciphers != NULL && info.nciphers > 0) {
for (j = i = 0; i < info.nciphers; i++) {
if (strncasecmp(info.ciphers[i], "RIJ", 3) == 0)
cipher_priority[j++] = GNUTLS_CIPHER_RIJNDAEL_128_CBC;
if (strncasecmp(info.ciphers[i], "TWO", 3) == 0)
cipher_priority[j++] = GNUTLS_CIPHER_TWOFISH_128_CBC;
if (strncasecmp(info.ciphers[i], "3DE", 3) == 0)
cipher_priority[j++] = GNUTLS_CIPHER_3DES_CBC;
if (strncasecmp(info.ciphers[i], "ARC", 3) == 0)
cipher_priority[j++] = GNUTLS_CIPHER_ARCFOUR;
}
cipher_priority[j] = 0;
}
if (info.macs != NULL && info.nmacs > 0) {
for (j = i = 0; i < info.nmacs; i++) {
if (strncasecmp(info.macs[i], "MD5", 3) == 0)
mac_priority[j++] = GNUTLS_MAC_MD5;
if (strncasecmp(info.macs[i], "SHA", 3) == 0)
mac_priority[j++] = GNUTLS_MAC_SHA;
}
mac_priority[j] = 0;
}
if (info.ctype != NULL && info.nctype > 0) {
for (j = i = 0; i < info.nctype; i++) {
if (strncasecmp(info.ctype[i], "OPE", 3) == 0)
cert_type_priority[j++] = GNUTLS_CRT_OPENPGP;
if (strncasecmp(info.ctype[i], "X", 1) == 0)
cert_type_priority[j++] = GNUTLS_CRT_X509;
}
cert_type_priority[j] = 0;
}
if (info.kx != NULL && info.nkx > 0) {
for (j = i = 0; i < info.nkx; i++) {
if (strncasecmp(info.kx[i], "SRP", 3) == 0)
kx_priority[j++] = GNUTLS_KX_SRP;
if (strncasecmp(info.kx[i], "RSA", 3) == 0)
kx_priority[j++] = GNUTLS_KX_RSA;
if (strncasecmp(info.kx[i], "DHE_RSA", 7) == 0)
kx_priority[j++] = GNUTLS_KX_DHE_RSA;
if (strncasecmp(info.kx[i], "DHE_DSS", 7) == 0)
kx_priority[j++] = GNUTLS_KX_DHE_DSS;
if (strncasecmp(info.kx[i], "ANON", 4) == 0)
kx_priority[j++] = GNUTLS_KX_ANON_DH;
}
kx_priority[j] = 0;
}
if (info.comp != NULL && info.ncomp > 0) {
for (j = i = 0; i < info.ncomp; i++) {
if (strncasecmp(info.comp[i], "NUL", 3) == 0)
comp_priority[j++] = GNUTLS_COMP_NULL;
if (strncasecmp(info.comp[i], "ZLI", 1) == 0)
comp_priority[j++] = GNUTLS_COMP_ZLIB;
}
comp_priority[j] = 0;
}
}
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