* Functions in this module handle SSL encryption when WebCit is running
* as an HTTPS server.
*
- * Copyright (c) 1996-2016 by the citadel.org team
+ * Copyright (c) 1996-2018 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.
}
+/*
+ * 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
*/
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) {
+ if (!SSLCritters)
+ {
syslog(LOG_ERR, "citserver: can't allocate memory!!");
exit(1);
- } else {
+ }
+ else
+ {
int a;
-
- for (a = 0; a < CRYPTO_num_locks(); a++) {
+ for (a = 0; a < CRYPTO_num_locks(); a++)
+ {
SSLCritters[a] = malloc(sizeof(pthread_mutex_t));
- if (!SSLCritters[a]) {
+ if (!SSLCritters[a])
+ {
syslog(LOG_INFO, "citserver: can't allocate memory!!");
exit(1);
}
SSL_library_init();
SSL_load_error_strings();
ssl_method = SSLv23_server_method();
- if (!(ssl_ctx = SSL_CTX_new(ssl_method))) {
+ if (!(ssl_ctx = SSL_CTX_new(ssl_method)))
+ {
syslog(LOG_WARNING, "SSL_CTX_new failed: %s", ERR_reason_error_string(ERR_get_error()));
return;
}
syslog(LOG_INFO, "Requesting cipher list: %s", ssl_cipher_list);
- if (!(SSL_CTX_set_cipher_list(ssl_ctx, ssl_cipher_list))) {
+ if (!(SSL_CTX_set_cipher_list(ssl_ctx, ssl_cipher_list)))
+ {
syslog(LOG_WARNING, "SSL_CTX_set_cipher_list failed: %s", ERR_reason_error_string(ERR_get_error()));
return;
}
/*
* 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.");
/*
* and we didn't just generate it now.
*/
fp = fopen(CTDL_KEY_PATH, "r");
- if (fp) {
+ if (fp)
+ {
rsa = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
fclose(fp);
}
- if (rsa) {
-
+ 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) {
+ if (req = X509_REQ_new(), req != NULL)
+ {
const char *env;
/* Set the public key */
X509_REQ_set_pubkey(req, pk);
X509_REQ_set_subject_name(req, name);
/* Sign the CSR */
- if (!X509_REQ_sign(req, pk, EVP_md5())) {
+ if (!X509_REQ_sign(req, pk, EVP_md5()))
+ {
syslog(LOG_WARNING, "X509_REQ_sign(): error");
}
- else {
+ else
+ {
/* Write it to disk. */
fp = fopen(CTDL_CSR_PATH, "w");
- if (fp != NULL) {
+ 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.
*/
- if (access(CTDL_CER_PATH, R_OK) != 0) {
+ if (access(CTDL_CER_PATH, R_OK) != 0)
+ {
syslog(LOG_INFO, "Generating a self-signed certificate.");
/* Same deal as before: always read the key from disk because
* it may or may not have just been generated.
*/
fp = fopen(CTDL_KEY_PATH, "r");
- if (fp) {
+ if (fp)
+ {
rsa = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
fclose(fp);
}
req = NULL;
cer = NULL;
pk = NULL;
- if (rsa) {
- if (pk=EVP_PKEY_new(), pk != NULL) {
+ if (rsa)
+ {
+ if (pk=EVP_PKEY_new(), pk != NULL)
+ {
EVP_PKEY_assign_RSA(pk, rsa);
}
fp = fopen(CTDL_CSR_PATH, "r");
- if (fp) {
+ if (fp)
+ {
req = PEM_read_X509_REQ(fp, NULL, NULL, NULL);
fclose(fp);
}
- if (req) {
- if (cer = X509_new(), cer != NULL) {
-
+ 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);
EVP_PKEY_free(req_pkey);
/* Sign the cert */
- if (!X509_sign(cer, pk, EVP_md5())) {
+ 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) {
+ 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) {
+ if (!ssl_ctx)
+ {
return;
}
- if (!(ch->ssl_handle = SSL_new(ssl_ctx))) {
+ if (!(ch->ssl_handle = SSL_new(ssl_ctx)))
+ {
syslog(LOG_WARNING, "SSL_new failed: %s", ERR_reason_error_string(ERR_get_error()));
return;
}
- if (!(SSL_set_fd(ch->ssl_handle, ch->sock))) {
+ if (!(SSL_set_fd(ch->ssl_handle, ch->sock)))
+ {
syslog(LOG_WARNING, "SSL_set_fd failed: %s", ERR_reason_error_string(ERR_get_error()));
SSL_free(ch->ssl_handle);
return;
}
retval = SSL_accept(ch->ssl_handle);
- if (retval < 1) {
+ if (retval < 1)
+ {
long errval;
const char *ssl_error_reason = NULL;
errval = SSL_get_error(ch->ssl_handle, retval);
ssl_error_reason = ERR_reason_error_string(ERR_get_error());
- if (ssl_error_reason == NULL) {
+ 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);
retval = SSL_accept(ch->ssl_handle);
}
- if (retval < 1) {
+ if (retval < 1)
+ {
long errval;
const char *ssl_error_reason = NULL;
errval = SSL_get_error(ch->ssl_handle, retval);
ssl_error_reason = ERR_reason_error_string(ERR_get_error());
- if (ssl_error_reason == NULL) {
+ 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)),
void endtls(struct client_handle *ch)
{
syslog(LOG_INFO, "Ending SSL/TLS");
- if (ch->ssl_handle != NULL) {
+ if (ch->ssl_handle != NULL)
+ {
SSL_shutdown(ch->ssl_handle);
SSL_get_SSL_CTX(ch->ssl_handle);
SSL_free(ch->ssl_handle);
if (ch->ssl_handle == NULL) return(-1);
nremain = nbytes;
- while (nremain > 0) {
- if (SSL_want_write(ch->ssl_handle)) {
- if ((SSL_read(ch->ssl_handle, junk, 0)) < 1) {
+ while (nremain > 0)
+ {
+ if (SSL_want_write(ch->ssl_handle))
+ {
+ if ((SSL_read(ch->ssl_handle, junk, 0)) < 1)
+ {
syslog(LOG_WARNING, "SSL_read in client_write: %s", ERR_reason_error_string(ERR_get_error()));
}
}
retval = SSL_write(ch->ssl_handle, &buf[nbytes - nremain], nremain);
- if (retval < 1) {
+ if (retval < 1)
+ {
long errval;
errval = SSL_get_error(ch->ssl_handle, retval);
- if (errval == SSL_ERROR_WANT_READ || errval == SSL_ERROR_WANT_WRITE) {
+ if (errval == SSL_ERROR_WANT_READ || errval == SSL_ERROR_WANT_WRITE)
+ {
sleep(1);
continue;
}
syslog(LOG_WARNING, "SSL_write got error %ld, ret %d", errval, retval);
- if (retval == -1) {
+ if (retval == -1)
+ {
syslog(LOG_WARNING, "errno is %d", errno);
endtls(ch);
}
if (ch->ssl_handle == NULL) return(-1);
- while (bytes_read < nbytes) {
- if (SSL_want_read(ch->ssl_handle)) {
- if ((SSL_write(ch->ssl_handle, junk, 0)) < 1) {
+ while (bytes_read < nbytes)
+ {
+ if (SSL_want_read(ch->ssl_handle))
+ {
+ if ((SSL_write(ch->ssl_handle, junk, 0)) < 1)
+ {
syslog(LOG_WARNING, "SSL_write in client_read");
}
}
rlen = SSL_read(ch->ssl_handle, &buf[bytes_read], nbytes-bytes_read);
- if (rlen < 1) {
+ if (rlen < 1)
+ {
long errval;
-
errval = SSL_get_error(ch->ssl_handle, rlen);
- if (errval == SSL_ERROR_WANT_READ || errval == SSL_ERROR_WANT_WRITE) {
+ if (errval == SSL_ERROR_WANT_READ || errval == SSL_ERROR_WANT_WRITE)
+ {
sleep(1);
continue;
}