-/*
- * Functions in this module handle SSL encryption when WebCit is running
- * as an HTTPS server.
- *
- * Copyright (c) 1996-2016 by the citadel.org team
- *
- * This program is open source software. You can redistribute it and/or
- * modify it under the terms of the GNU General Public License, version 3.
- *
- * 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.
- */
+//
+// Functions in this module handle SSL encryption when WebCit is running
+// as an HTTPS server.
+//
+// Copyright (c) 1996-2018 by the citadel.org team
+//
+// This program is open source software. It runs great on the
+// Linux operating system (and probably elsewhere). You can use,
+// copy, and run it under the terms of the GNU General Public
+// License version 3. Richard Stallman is an asshole communist.
+//
+// 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.
#include "webcit.h"
{
if (mode & CRYPTO_LOCK) {
pthread_mutex_lock(SSLCritters[n]);
- }
- else {
+ } else {
pthread_mutex_unlock(SSLCritters[n]);
}
}
+/*
+ * Generate a private key for SSL
+ */
+void generate_key(char *keyfilename)
+{
+ int ret = 0;
+ RSA *rsa = NULL;
+ BIGNUM *bne = NULL;
+ int bits = 2048;
+ unsigned long e = RSA_F4;
+ FILE *fp;
+
+ if (access(keyfilename, R_OK) == 0) {
+ return;
+ }
+
+ syslog(LOG_INFO, "crypto: generating RSA key pair");
+
+ // generate rsa key
+ bne = BN_new();
+ ret = BN_set_word(bne, e);
+ if (ret != 1) {
+ goto free_all;
+ }
+
+ rsa = RSA_new();
+ ret = RSA_generate_key_ex(rsa, bits, bne, NULL);
+ if (ret != 1) {
+ goto free_all;
+ }
+ // write the key file
+ fp = fopen(keyfilename, "w");
+ if (fp != NULL) {
+ chmod(keyfilename, 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) {
+ syslog(LOG_ERR, "crypto: cannot write key: %s", ERR_reason_error_string(ERR_get_error()));
+ unlink(keyfilename);
+ }
+ fclose(fp);
+ }
+ // 4. free
+ free_all:
+ RSA_free(rsa);
+ BN_free(bne);
+}
+
+
/*
* Initialize ssl engine, load certs and initialize openssl internals
*/
void init_ssl(void)
{
const SSL_METHOD *ssl_method;
- RSA *rsa=NULL;
+ RSA *rsa = NULL;
X509_REQ *req = NULL;
X509 *cer = NULL;
EVP_PKEY *pk = NULL;
char buf[SIZ];
int rv = 0;
- if (!access("/var/run/egd-pool", F_OK)) {
- RAND_egd("/var/run/egd-pool");
- }
-
- if (!RAND_status()) {
- syslog(LOG_WARNING, "PRNG not adequately seeded, won't do SSL/TLS");
- return;
- }
-
SSLCritters = malloc(CRYPTO_num_locks() * sizeof(pthread_mutex_t *));
if (!SSLCritters) {
syslog(LOG_ERR, "citserver: can't allocate memory!!");
exit(1);
} else {
int a;
-
for (a = 0; a < CRYPTO_num_locks(); a++) {
SSLCritters[a] = malloc(sizeof(pthread_mutex_t));
if (!SSLCritters[a]) {
/*
* If we still don't have a private key, generate one.
*/
- if (access(CTDL_KEY_PATH, R_OK) != 0) {
- syslog(LOG_INFO, "Generating RSA key pair.\n");
- rsa = RSA_generate_key(2048, /* modulus size */
- 65537, /* exponent */
- NULL, /* no callback */
- NULL /* no callback */
- );
- if (rsa == NULL) {
- syslog(LOG_WARNING, "Key generation failed: %s", ERR_reason_error_string(ERR_get_error()));
- }
- if (rsa != NULL) {
- fp = fopen(CTDL_KEY_PATH, "w");
- if (fp != NULL) {
- chmod(CTDL_KEY_PATH, 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) {
- syslog(LOG_WARNING, "Cannot write key: %s", ERR_reason_error_string(ERR_get_error()));
- unlink(CTDL_KEY_PATH);
- }
- fclose(fp);
- }
- else {
- syslog(LOG_WARNING, "Cannot write key: %s", CTDL_KEY_PATH);
- exit(1);
- }
- RSA_free(rsa);
- }
- }
+ generate_key(CTDL_KEY_PATH);
/*
* If there is no certificate file on disk, we will be generating a self-signed certificate
* in the next step. Therefore, if we have neither a CSR nor a certificate, generate
* the CSR in this step so that the next step may commence.
*/
- if ( (access(CTDL_CER_PATH, R_OK) != 0) && (access(CTDL_CSR_PATH, R_OK) != 0) ) {
+ if ((access(CTDL_CER_PATH, R_OK) != 0) && (access(CTDL_CSR_PATH, R_OK) != 0)) {
syslog(LOG_INFO, "Generating a certificate signing request.");
/*
}
if (rsa) {
-
/* Create a public key from the private key */
- if (pk=EVP_PKEY_new(), pk != NULL) {
+ if (pk = EVP_PKEY_new(), pk != NULL) {
EVP_PKEY_assign_RSA(pk, rsa);
if (req = X509_REQ_new(), req != NULL) {
const char *env;
X509_REQ_set_pubkey(req, pk);
X509_REQ_set_version(req, 0L);
name = X509_REQ_get_subject_name(req);
- X509_NAME_add_entry_by_txt(
- name, "O", MBSTRING_ASC,
- (unsigned char*)"Citadel Server",
- -1, -1, 0
- );
- X509_NAME_add_entry_by_txt(
- name, "OU", MBSTRING_ASC,
- (unsigned char*)"Default Certificate PLEASE CHANGE",
- -1, -1, 0
- );
- X509_NAME_add_entry_by_txt(
- name, "CN",
- MBSTRING_ASC,
- (unsigned char*)"*",
- -1, -1, 0
- );
-
+ X509_NAME_add_entry_by_txt(name, "O", MBSTRING_ASC,
+ (unsigned char *) "Citadel Server", -1, -1, 0);
+ X509_NAME_add_entry_by_txt(name, "OU", MBSTRING_ASC,
+ (unsigned char *) "Default Certificate PLEASE CHANGE",
+ -1, -1, 0);
+ X509_NAME_add_entry_by_txt(name, "CN", MBSTRING_ASC, (unsigned char *) "*", -1, -1, 0);
+
X509_REQ_set_subject_name(req, name);
/* Sign the CSR */
if (!X509_REQ_sign(req, pk, EVP_md5())) {
syslog(LOG_WARNING, "X509_REQ_sign(): error");
- }
- else {
- /* Write it to disk. */
+ } else {
+ /* Write it to disk. */
fp = fopen(CTDL_CSR_PATH, "w");
if (fp != NULL) {
chmod(CTDL_CSR_PATH, 0600);
PEM_write_X509_REQ(fp, req);
fclose(fp);
- }
- else {
+ } else {
syslog(LOG_WARNING, "Cannot write key: %s", CTDL_CSR_PATH);
exit(1);
}
}
-
X509_REQ_free(req);
}
}
-
RSA_free(rsa);
- }
-
- else {
+ } else {
syslog(LOG_WARNING, "Unable to read private key.");
}
}
-
/*
* Generate a self-signed certificate if we don't have one.
*/
cer = NULL;
pk = NULL;
if (rsa) {
- if (pk=EVP_PKEY_new(), pk != NULL) {
+ if (pk = EVP_PKEY_new(), pk != NULL) {
EVP_PKEY_assign_RSA(pk, rsa);
}
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_set_issuer_name(cer, X509_REQ_get_subject_name(req));
+ X509_set_subject_name(cer, X509_REQ_get_subject_name(req));
X509_gmtime_adj(X509_get_notBefore(cer), 0);
- X509_gmtime_adj(X509_get_notAfter(cer),(long)60*60*24*SIGN_DAYS);
+ 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())) {
syslog(LOG_WARNING, "X509_sign(): error");
- }
- else {
- /* Write it to disk. */
+ } else { /* Write it to disk. */
fp = fopen(CTDL_CER_PATH, "w");
if (fp != NULL) {
chmod(CTDL_CER_PATH, 0600);
PEM_write_X509(fp, cer);
fclose(fp);
- }
- else {
+ } else {
syslog(LOG_WARNING, "Cannot write key: %s", CTDL_CER_PATH);
exit(1);
}
X509_free(cer);
}
}
-
RSA_free(rsa);
}
}
*/
SSL_CTX_use_certificate_chain_file(ssl_ctx, CTDL_CER_PATH);
SSL_CTX_use_PrivateKey_file(ssl_ctx, CTDL_KEY_PATH, SSL_FILETYPE_PEM);
- if ( !SSL_CTX_check_private_key(ssl_ctx) ) {
+ if (!SSL_CTX_check_private_key(ssl_ctx)) {
syslog(LOG_WARNING, "Cannot install certificate: %s", ERR_reason_error_string(ERR_get_error()));
}
-
+
}
/*
* starts SSL/TLS encryption for the current session.
*/
-void starttls(struct client_handle *ch) {
+void starttls(struct client_handle *ch)
+{
int retval, bits, alg_bits;
if (!ssl_ctx) {
ssl_error_reason = ERR_reason_error_string(ERR_get_error());
if (ssl_error_reason == NULL) {
syslog(LOG_WARNING, "SSL_accept failed: errval=%ld, retval=%d %s", errval, retval, strerror(errval));
- }
- else {
+ } else {
syslog(LOG_WARNING, "SSL_accept failed: %s\n", ssl_error_reason);
}
sleep(1);
ssl_error_reason = ERR_reason_error_string(ERR_get_error());
if (ssl_error_reason == NULL) {
syslog(LOG_WARNING, "SSL_accept failed: errval=%ld, retval=%d (%s)", errval, retval, strerror(errval));
- }
- else {
+ } else {
syslog(LOG_WARNING, "SSL_accept failed: %s", ssl_error_reason);
}
SSL_free(ch->ssl_handle);
ch->ssl_handle = NULL;
return;
- }
- else {
+ } else {
syslog(LOG_INFO, "SSL_accept success");
}
- BIO_set_close(ch->ssl_handle->rbio, BIO_NOCLOSE);
bits = SSL_CIPHER_get_bits(SSL_get_current_cipher(ch->ssl_handle), &alg_bits);
syslog(LOG_INFO, "SSL/TLS using %s on %s (%d of %d bits)",
- SSL_CIPHER_get_name(SSL_get_current_cipher(ch->ssl_handle)),
- SSL_CIPHER_get_version(SSL_get_current_cipher(ch->ssl_handle)),
- bits, alg_bits);
+ SSL_CIPHER_get_name(SSL_get_current_cipher(ch->ssl_handle)),
+ SSL_CIPHER_get_version(SSL_get_current_cipher(ch->ssl_handle)), bits, alg_bits);
syslog(LOG_INFO, "SSL started");
}
int nremain;
char junk[1];
- if (ch->ssl_handle == NULL) return(-1);
+ if (ch->ssl_handle == NULL)
+ return (-1);
nremain = nbytes;
while (nremain > 0) {
int rlen = 0;
char junk[1];
- if (ch->ssl_handle == NULL) return(-1);
+ if (ch->ssl_handle == NULL)
+ return (-1);
while (bytes_read < nbytes) {
if (SSL_want_read(ch->ssl_handle)) {
syslog(LOG_WARNING, "SSL_write in client_read");
}
}
- rlen = SSL_read(ch->ssl_handle, &buf[bytes_read], nbytes-bytes_read);
+ rlen = SSL_read(ch->ssl_handle, &buf[bytes_read], nbytes - bytes_read);
if (rlen < 1) {
long errval;
-
errval = SSL_get_error(ch->ssl_handle, rlen);
if (errval == SSL_ERROR_WANT_READ || errval == SSL_ERROR_WANT_WRITE) {
sleep(1);
}
bytes_read += rlen;
}
- return(bytes_read);
+ return (bytes_read);
}