/* $Id$ */
+#include <string.h>
#include <unistd.h>
+#include <sys/stat.h>
#include <sys/types.h>
#include "sysdep.h"
+
#ifdef HAVE_OPENSSL
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#endif
+
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+# include <sys/time.h>
+# else
+# include <time.h>
+# endif
+#endif
+
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif
+
+#ifdef HAVE_SYS_SELECT_H
+#include <sys/select.h>
+#endif
+
#include <stdio.h>
#include "server.h"
#include "serv_crypto.h"
#include "sysdep_decls.h"
-#include "dynloader.h"
+#include "citadel.h"
+#include "config.h"
+
+#include "ctdl_module.h"
+/* TODO: should we use the standard module init stuff to start this? */
+/* TODO: should we register an event handler to call destruct_ssl? */
#ifdef HAVE_OPENSSL
-SSL_CTX *ssl_ctx; /* SSL context */
-pthread_mutex_t **SSLCritters; /* Things needing locking */
+SSL_CTX *ssl_ctx; /* SSL context */
+pthread_mutex_t **SSLCritters; /* Things needing locking */
+static unsigned long id_callback(void)
+{
+ return (unsigned long) pthread_self();
+}
+
+void destruct_ssl(void)
+{
+ int a;
+ CtdlUnregisterProtoHook(cmd_stls, "STLS");
+ CtdlUnregisterProtoHook(cmd_gtls, "GTLS");
+ for (a = 0; a < CRYPTO_num_locks(); a++)
+ free(SSLCritters[a]);
+ free (SSLCritters);
+}
void init_ssl(void)
{
SSL_METHOD *ssl_method;
DH *dh;
-
+ RSA *rsa=NULL;
+ X509_REQ *req = NULL;
+ X509 *cer = NULL;
+ EVP_PKEY *pk = NULL;
+ EVP_PKEY *req_pkey = NULL;
+ X509_NAME *name = NULL;
+ FILE *fp;
+
+ if (!access(EGD_POOL, F_OK))
+ RAND_egd(EGD_POOL);
+
if (!RAND_status()) {
- lprintf(2, "PRNG not adequately seeded, won't do SSL/TLS\n");
+ lprintf(CTDL_CRIT,
+ "PRNG not adequately seeded, won't do SSL/TLS\n");
return;
}
- SSLCritters = mallok(CRYPTO_num_locks() * sizeof (pthread_mutex_t *));
+ SSLCritters =
+ malloc(CRYPTO_num_locks() * sizeof(pthread_mutex_t *));
if (!SSLCritters) {
- lprintf(1, "citserver: can't allocate memory!!\n");
+ lprintf(CTDL_EMERG, "citserver: can't allocate memory!!\n");
/* Nothing's been initialized, just die */
exit(1);
} else {
int a;
- for (a=0; a<CRYPTO_num_locks(); a++) {
- SSLCritters[a] = mallok(sizeof (pthread_mutex_t));
+ for (a = 0; a < CRYPTO_num_locks(); a++) {
+ SSLCritters[a] = malloc(sizeof(pthread_mutex_t));
if (!SSLCritters[a]) {
- lprintf(1, "citserver: can't allocate memory!!\n");
+ lprintf(CTDL_EMERG,
+ "citserver: can't allocate memory!!\n");
/* Nothing's been initialized, just die */
exit(1);
}
SSL_load_error_strings();
ssl_method = SSLv23_server_method();
if (!(ssl_ctx = SSL_CTX_new(ssl_method))) {
- lprintf(2, "SSL_CTX_new failed: %s\n",
- ERR_reason_error_string(ERR_get_error()));
+ lprintf(CTDL_CRIT, "SSL_CTX_new failed: %s\n",
+ ERR_reason_error_string(ERR_get_error()));
return;
}
if (!(SSL_CTX_set_cipher_list(ssl_ctx, CIT_CIPHERS))) {
- lprintf(2, "SSL: No ciphers available\n");
+ lprintf(CTDL_CRIT, "SSL: No ciphers available\n");
SSL_CTX_free(ssl_ctx);
ssl_ctx = NULL;
return;
#if 0
#if SSLEAY_VERSION_NUMBER >= 0x00906000L
SSL_CTX_set_mode(ssl_ctx, SSL_CTX_get_mode(ssl_ctx) |
- SSL_MODE_AUTO_RETRY);
+ SSL_MODE_AUTO_RETRY);
#endif
#endif
+
CRYPTO_set_locking_callback(ssl_lock);
- CRYPTO_set_id_callback(pthread_self);
+ CRYPTO_set_id_callback(id_callback);
/* Load DH parameters into the context */
dh = DH_new();
if (!dh) {
- lprintf(2, "init_ssl() can't allocate a DH object: %s\n",
- ERR_reason_error_string(ERR_get_error()));
+ lprintf(CTDL_CRIT, "init_ssl() can't allocate a DH object: %s\n",
+ ERR_reason_error_string(ERR_get_error()));
SSL_CTX_free(ssl_ctx);
ssl_ctx = NULL;
return;
}
if (!(BN_hex2bn(&(dh->p), DH_P))) {
- lprintf(2, "init_ssl() can't assign DH_P: %s\n",
- ERR_reason_error_string(ERR_get_error()));
+ lprintf(CTDL_CRIT, "init_ssl() can't assign DH_P: %s\n",
+ ERR_reason_error_string(ERR_get_error()));
SSL_CTX_free(ssl_ctx);
ssl_ctx = NULL;
return;
}
if (!(BN_hex2bn(&(dh->g), DH_G))) {
- lprintf(2, "init_ssl() can't assign DH_G: %s\n",
- ERR_reason_error_string(ERR_get_error()));
+ lprintf(CTDL_CRIT, "init_ssl() can't assign DH_G: %s\n",
+ ERR_reason_error_string(ERR_get_error()));
SSL_CTX_free(ssl_ctx);
ssl_ctx = NULL;
return;
SSL_CTX_set_tmp_dh(ssl_ctx, dh);
DH_free(dh);
+ /* Get our certificates in order.
+ * First, create the key/cert directory if it's not there already...
+ */
+ mkdir(ctdl_key_dir, 0700);
+
+ /*
+ * Generate a key pair if we don't have one.
+ */
+ if (access(file_crpt_file_key, R_OK) != 0) {
+ lprintf(CTDL_INFO, "Generating RSA key pair.\n");
+ rsa = RSA_generate_key(1024, /* modulus size */
+ 65537, /* exponent */
+ NULL, /* no callback */
+ NULL); /* no callback */
+ if (rsa == NULL) {
+ lprintf(CTDL_CRIT, "Key generation failed: %s\n",
+ ERR_reason_error_string(ERR_get_error()));
+ }
+ if (rsa != NULL) {
+ fp = fopen(file_crpt_file_key, "w");
+ if (fp != NULL) {
+ chmod(file_crpt_file_key, 0600);
+ if (PEM_write_RSAPrivateKey(fp, /* the file */
+ rsa, /* the key */
+ NULL, /* no enc */
+ NULL, /* no passphr */
+ 0, /* no passphr */
+ NULL, /* no callbk */
+ NULL /* no callbk */
+ ) != 1) {
+ lprintf(CTDL_CRIT, "Cannot write key: %s\n",
+ ERR_reason_error_string(ERR_get_error()));
+ unlink(file_crpt_file_key);
+ }
+ fclose(fp);
+ }
+ RSA_free(rsa);
+ }
+ }
+
+ /*
+ * Generate a CSR if we don't have one.
+ */
+ if (access(file_crpt_file_csr, R_OK) != 0) {
+ lprintf(CTDL_INFO, "Generating a certificate signing request.\n");
+
+ /*
+ * Read our key from the file. No, we don't just keep this
+ * in memory from the above key-generation function, because
+ * there is the possibility that the key was already on disk
+ * and we didn't just generate it now.
+ */
+ fp = fopen(file_crpt_file_key, "r");
+ if (fp) {
+ rsa = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
+ fclose(fp);
+ }
+
+ if (rsa) {
+
+ /* Create a public key from the private key */
+ if (pk=EVP_PKEY_new(), pk != NULL) {
+ EVP_PKEY_assign_RSA(pk, rsa);
+ if (req = X509_REQ_new(), req != NULL) {
+
+ /* Set the public key */
+ X509_REQ_set_pubkey(req, pk);
+ X509_REQ_set_version(req, 0L);
+
+ name = X509_REQ_get_subject_name(req);
+
+ /* Tell it who we are */
+
+ /*
+ X509_NAME_add_entry_by_txt(name, "C",
+ MBSTRING_ASC, "US", -1, -1, 0);
+
+ X509_NAME_add_entry_by_txt(name, "ST",
+ MBSTRING_ASC, "New York", -1, -1, 0);
+
+ X509_NAME_add_entry_by_txt(name, "L",
+ MBSTRING_ASC, "Mount Kisco", -1, -1, 0);
+ */
+
+ X509_NAME_add_entry_by_txt(name, "O",
+ MBSTRING_ASC, config.c_humannode, -1, -1, 0);
+
+ X509_NAME_add_entry_by_txt(name, "OU",
+ MBSTRING_ASC, "Citadel server", -1, -1, 0);
+
+ /* X509_NAME_add_entry_by_txt(name, "CN",
+ MBSTRING_ASC, config.c_fqdn, -1, -1, 0);
+ */
+
+ X509_NAME_add_entry_by_txt(name, "CN",
+ MBSTRING_ASC, "*", -1, -1, 0);
+
+ X509_REQ_set_subject_name(req, name);
+
+ /* Sign the CSR */
+ if (!X509_REQ_sign(req, pk, EVP_md5())) {
+ lprintf(CTDL_CRIT, "X509_REQ_sign(): error\n");
+ }
+ else {
+ /* Write it to disk. */
+ fp = fopen(file_crpt_file_csr, "w");
+ if (fp != NULL) {
+ chmod(file_crpt_file_csr, 0600);
+ PEM_write_X509_REQ(fp, req);
+ fclose(fp);
+ }
+ }
+
+ X509_REQ_free(req);
+ }
+ }
+
+ RSA_free(rsa);
+ }
+
+ else {
+ lprintf(CTDL_CRIT, "Unable to read private key.\n");
+ }
+ }
+
+
+
+ /*
+ * Generate a self-signed certificate if we don't have one.
+ */
+ if (access(file_crpt_file_cer, R_OK) != 0) {
+ lprintf(CTDL_INFO, "Generating a self-signed certificate.\n");
+
+ /* Same deal as before: always read the key from disk because
+ * it may or may not have just been generated.
+ */
+ fp = fopen(file_crpt_file_key, "r");
+ if (fp) {
+ rsa = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
+ fclose(fp);
+ }
+
+ /* This also holds true for the CSR. */
+ req = NULL;
+ cer = NULL;
+ pk = NULL;
+ if (rsa) {
+ if (pk=EVP_PKEY_new(), pk != NULL) {
+ EVP_PKEY_assign_RSA(pk, rsa);
+ }
+
+ fp = fopen(file_crpt_file_csr, "r");
+ if (fp) {
+ req = PEM_read_X509_REQ(fp, NULL, NULL, NULL);
+ fclose(fp);
+ }
+
+ if (req) {
+ if (cer = X509_new(), cer != NULL) {
+
+ ASN1_INTEGER_set(X509_get_serialNumber(cer), 0);
+ X509_set_issuer_name(cer, req->req_info->subject);
+ X509_set_subject_name(cer, req->req_info->subject);
+ X509_gmtime_adj(X509_get_notBefore(cer),0);
+ X509_gmtime_adj(X509_get_notAfter(cer),(long)60*60*24*SIGN_DAYS);
+ req_pkey = X509_REQ_get_pubkey(req);
+ X509_set_pubkey(cer, req_pkey);
+ EVP_PKEY_free(req_pkey);
+
+ /* Sign the cert */
+ if (!X509_sign(cer, pk, EVP_md5())) {
+ lprintf(CTDL_CRIT, "X509_sign(): error\n");
+ }
+ else {
+ /* Write it to disk. */
+ fp = fopen(file_crpt_file_cer, "w");
+ if (fp != NULL) {
+ chmod(file_crpt_file_cer, 0600);
+ PEM_write_X509(fp, cer);
+ fclose(fp);
+ }
+ }
+ X509_free(cer);
+ }
+ }
+
+ RSA_free(rsa);
+ }
+ }
+
+
+ /*
+ * Now try to bind to the key and certificate.
+ */
+ SSL_CTX_use_certificate_chain_file(ssl_ctx, file_crpt_file_cer);
+ SSL_CTX_use_PrivateKey_file(ssl_ctx, file_crpt_file_key, SSL_FILETYPE_PEM);
+ if ( !SSL_CTX_check_private_key(ssl_ctx) ) {
+ lprintf(CTDL_CRIT, "Cannot install certificate: %s\n",
+ ERR_reason_error_string(ERR_get_error()));
+ }
+
/* Finally let the server know we're here */
CtdlRegisterProtoHook(cmd_stls, "STLS", "Start SSL/TLS session");
- CtdlRegisterProtoHook(cmd_gtls, "GTLS", "Get SSL/TLS session status");
- CtdlRegisterProtoHook(cmd_etls, "ETLS", "End SSL/TLS session");
- CtdlRegisterSessionHook(endtls_atlogout, EVT_STOP);
+ CtdlRegisterProtoHook(cmd_gtls, "GTLS",
+ "Get SSL/TLS session status");
+ CtdlRegisterSessionHook(endtls, EVT_STOP);
}
while (nremain > 0) {
if (SSL_want_write(CC->ssl)) {
if ((SSL_read(CC->ssl, junk, 0)) < 1) {
- lprintf(9, "SSL_read in client_write:\n");
- ERR_print_errors_fp(stderr);
+ lprintf(CTDL_DEBUG, "SSL_read in client_write: %s\n", ERR_reason_error_string(ERR_get_error()));
}
}
- retval = SSL_write(CC->ssl, &buf[nbytes - nremain], nremain);
+ retval =
+ SSL_write(CC->ssl, &buf[nbytes - nremain], nremain);
if (retval < 1) {
long errval;
errval = SSL_get_error(CC->ssl, retval);
if (errval == SSL_ERROR_WANT_READ ||
- errval == SSL_ERROR_WANT_WRITE) {
+ errval == SSL_ERROR_WANT_WRITE) {
sleep(1);
continue;
}
- lprintf(9, "SSL_write got error %ld\n", errval);
- endtls(1);
+ lprintf(CTDL_DEBUG, "SSL_write got error %ld, ret %d\n", errval, retval);
+ if (retval == -1)
+ lprintf(CTDL_DEBUG, "errno is %d\n", errno);
+ endtls();
client_write(&buf[nbytes - nremain], nremain);
return;
}
*/
int client_read_ssl(char *buf, int bytes, int timeout)
{
- int len,rlen;
+#if 0
fd_set rfds;
struct timeval tv;
int retval;
int s;
+#endif
+ int len, rlen;
char junk[1];
len = 0;
- while(len<bytes) {
+ while (len < bytes) {
+#if 0
+ /*
+ * This code is disabled because we don't need it when
+ * using blocking reads (which we are). -IO
+ */
FD_ZERO(&rfds);
s = BIO_get_fd(CC->ssl->rbio, NULL);
FD_SET(s, &rfds);
tv.tv_sec = timeout;
tv.tv_usec = 0;
- retval = select(s+1, &rfds, NULL, NULL, &tv);
+ retval = select(s + 1, &rfds, NULL, NULL, &tv);
if (FD_ISSET(s, &rfds) == 0) {
- return(0);
+ return (0);
}
+#endif
if (SSL_want_read(CC->ssl)) {
if ((SSL_write(CC->ssl, junk, 0)) < 1) {
- lprintf(9, "SSL_write in client_read:\n");
- ERR_print_errors_fp(stderr);
+ lprintf(CTDL_DEBUG, "SSL_write in client_read: %s\n", ERR_reason_error_string(ERR_get_error()));
}
}
- rlen = SSL_read(CC->ssl, &buf[len], bytes-len);
- if (rlen<1) {
+ rlen = SSL_read(CC->ssl, &buf[len], bytes - len);
+ if (rlen < 1) {
long errval;
errval = SSL_get_error(CC->ssl, rlen);
if (errval == SSL_ERROR_WANT_READ ||
- errval == SSL_ERROR_WANT_WRITE) {
+ errval == SSL_ERROR_WANT_WRITE) {
sleep(1);
continue;
}
- lprintf(9, "SSL_read got error %ld\n", errval);
- endtls(1);
- return (client_read_to(&buf[len], bytes - len, timeout));
+ lprintf(CTDL_DEBUG, "SSL_read got error %ld\n", errval);
+ endtls();
+ return (client_read_to
+ (&buf[len], bytes - len, timeout));
}
len += rlen;
}
- return(1);
+ return (1);
}
/*
- * cmd_stls() starts SSL/TLS encryption for the current session
+ * CtdlStartTLS() starts SSL/TLS encryption for the current session. It
+ * must be supplied with pre-generated strings for responses of "ok," "no
+ * support for TLS," and "error" so that we can use this in any protocol.
*/
-void cmd_stls(char *params)
-{
+void CtdlStartTLS(char *ok_response, char *nosup_response,
+ char *error_response) {
+
int retval, bits, alg_bits;
if (!ssl_ctx) {
- cprintf("%d No SSL_CTX available\n", ERROR);
+ lprintf(CTDL_CRIT, "SSL failed: no ssl_ctx exists?\n");
+ if (nosup_response != NULL) cprintf("%s", nosup_response);
return;
}
if (!(CC->ssl = SSL_new(ssl_ctx))) {
- lprintf(2, "SSL_new failed: %s\n",
- ERR_reason_error_string(ERR_peek_error()));
- cprintf("%d SSL_new: %s\n", ERROR,
+ lprintf(CTDL_CRIT, "SSL_new failed: %s\n",
ERR_reason_error_string(ERR_get_error()));
+ if (error_response != NULL) cprintf("%s", error_response);
return;
}
if (!(SSL_set_fd(CC->ssl, CC->client_socket))) {
- lprintf(2, "SSL_set_fd failed: %s\n",
- ERR_reason_error_string(ERR_peek_error()));
+ lprintf(CTDL_CRIT, "SSL_set_fd failed: %s\n",
+ ERR_reason_error_string(ERR_get_error()));
SSL_free(CC->ssl);
CC->ssl = NULL;
- cprintf("%d SSL_set_fd: %s\n", ERROR,
- ERR_reason_error_string(ERR_get_error()));
+ if (error_response != NULL) cprintf("%s", error_response);
return;
}
- cprintf("%d \n", OK);
+ if (ok_response != NULL) cprintf("%s", ok_response);
retval = SSL_accept(CC->ssl);
if (retval < 1) {
/*
* revert to unencrypted communications.
*/
long errval;
+ char error_string[128];
errval = SSL_get_error(CC->ssl, retval);
- lprintf(2, "SSL_accept failed: %s\n",
- ERR_reason_error_string(ERR_get_error()));
+ lprintf(CTDL_CRIT, "SSL_accept failed: retval=%d, errval=%ld, err=%s\n",
+ retval,
+ errval,
+ ERR_error_string(errval, error_string)
+ );
SSL_free(CC->ssl);
CC->ssl = NULL;
return;
}
BIO_set_close(CC->ssl->rbio, BIO_NOCLOSE);
bits = SSL_CIPHER_get_bits(SSL_get_current_cipher(CC->ssl), &alg_bits);
- lprintf(3, "Session %d using %s on %s (%d of %d bits)\n", CC->cs_pid,
- SSL_CIPHER_get_name(SSL_get_current_cipher(CC->ssl)),
- SSL_CIPHER_get_version(SSL_get_current_cipher(CC->ssl)),
- bits, alg_bits);
+ lprintf(CTDL_INFO, "SSL/TLS using %s on %s (%d of %d bits)\n",
+ SSL_CIPHER_get_name(SSL_get_current_cipher(CC->ssl)),
+ SSL_CIPHER_get_version(SSL_get_current_cipher(CC->ssl)),
+ bits, alg_bits);
CC->redirect_ssl = 1;
}
+/*
+ * cmd_stls() starts SSL/TLS encryption for the current session
+ */
+void cmd_stls(char *params)
+{
+ char ok_response[SIZ];
+ char nosup_response[SIZ];
+ char error_response[SIZ];
+
+ unbuffer_output();
+
+ sprintf(ok_response,
+ "%d Begin TLS negotiation now\n",
+ CIT_OK);
+ sprintf(nosup_response,
+ "%d TLS not supported here\n",
+ ERROR + CMD_NOT_SUPPORTED);
+ sprintf(error_response,
+ "%d TLS negotiation error\n",
+ ERROR + INTERNAL_ERROR);
+
+ CtdlStartTLS(ok_response, nosup_response, error_response);
+}
+
+
/*
* cmd_gtls() returns status info about the TLS connection
*/
void cmd_gtls(char *params)
{
int bits, alg_bits;
-
+
if (!CC->ssl || !CC->redirect_ssl) {
cprintf("%d Session is not encrypted.\n", ERROR);
return;
}
- bits = SSL_CIPHER_get_bits(SSL_get_current_cipher(CC->ssl), &alg_bits);
- cprintf("%d %s|%s|%d|%d\n", OK,
+ bits =
+ SSL_CIPHER_get_bits(SSL_get_current_cipher(CC->ssl),
+ &alg_bits);
+ cprintf("%d %s|%s|%d|%d\n", CIT_OK,
SSL_CIPHER_get_version(SSL_get_current_cipher(CC->ssl)),
SSL_CIPHER_get_name(SSL_get_current_cipher(CC->ssl)),
alg_bits, bits);
}
-/* Logout function hook */
-void endtls_atlogout(void)
-{
- endtls(1);
-}
-
-
-/* Command function hook */
-void cmd_etls(char *params)
-{
- endtls(0);
-}
-
-
/*
* endtls() shuts down the TLS connection
- * Parameter is NULL for client request, CitContext * for server request
*
* WARNING: This may make your session vulnerable to a known plaintext
* attack in the current implmentation.
*/
-void endtls(int who)
+void endtls(void)
{
- lprintf(7, "Session %d ending SSL/TLS%s\n", CC->cs_pid,
- (who) ? "" : " at client request");
-
- if (!who) {
- if (!CC->ssl) {
- cprintf("%d Connection is not encrypted.\n", ERROR);
- return;
- }
- cprintf("%d Now stop encryption.\n", OK);
- } else if (!CC->ssl) {
+ if (!CC->ssl) {
+ CC->redirect_ssl = 0;
return;
}
-
+
+ lprintf(CTDL_INFO, "Ending SSL/TLS\n");
SSL_shutdown(CC->ssl);
SSL_free(CC->ssl);
CC->ssl = NULL;
else
pthread_mutex_unlock(SSLCritters[n]);
}
-#endif /* HAVE_OPENSSL */
+#endif /* HAVE_OPENSSL */
projects / citadel.git / blobdiff