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/*
* Copyright (c) 2013 Sunil Nimmagadda <sunil@nimmagadda.net>
* Copyright (c) 2006 Pierre-Yves Ritschard <pyr@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <syslog.h>
#include <unistd.h>
#include <openssl/ssl.h>
#include <openssl/engine.h>
#include <openssl/err.h>
#include "pop3d.h"
#include "ssl.h"
#define SSL_CIPHERS "HIGH"
#define SSL_SESSION_TIMEOUT 300
static char *ssl_load_file(const char *, off_t *);
void
ssl_init(void)
{
/* SSL init */
SSL_library_init();
SSL_load_error_strings();
OpenSSL_add_all_algorithms();
/* Init hardware cryto engines. */
ENGINE_load_builtin_engines();
ENGINE_register_all_complete();
}
void *
ssl_setup(const char *certfile, const char *keyfile)
{
SSL_CTX *ctx = NULL;
char *cert, *key;
off_t cert_len, key_len;
/* SSL context creation */
ctx = SSL_CTX_new(SSLv23_server_method());
if (ctx == NULL) {
ssl_error("ssl_ctx_create");
fatal("ssl_ctx_create: could not create SSL context");
}
SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
SSL_CTX_set_timeout(ctx, SSL_SESSION_TIMEOUT);
SSL_CTX_set_options(ctx,
SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET);
SSL_CTX_set_options(ctx,
SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION);
/* SSL certificate, key loading */
cert = ssl_load_file(certfile, &cert_len);
if (cert == NULL)
fatal("ssl_load_file: certificate");
key = ssl_load_file(keyfile, &key_len);
if (key == NULL)
fatal("ssl_load_file: key");
if (!SSL_CTX_set_cipher_list(ctx, SSL_CIPHERS))
goto err;
if (!ssl_ctx_use_certificate_chain(ctx, cert, cert_len))
goto err;
else if (!ssl_ctx_use_private_key(ctx, key, key_len))
goto err;
else if (!SSL_CTX_check_private_key(ctx))
goto err;
return (ctx);
err:
if (ctx != NULL)
SSL_CTX_free(ctx);
ssl_error("ssl_setup");
fatal("ssl_setup: cannot set SSL up");
return (NULL);
}
void *
pop3s_init(SSL_CTX *ctx, int fd)
{
SSL *ssl;
if ((ssl = SSL_new(ctx)) == NULL)
fatal("SSL_new");
if (SSL_set_fd(ssl, fd) == 0)
fatal("SSL_set_fd");
return (ssl);
}
static char *
ssl_load_file(const char *name, off_t *len)
{
struct stat st;
off_t size;
char *buf = NULL;
int fd;
if ((fd = open(name, O_RDONLY)) == -1)
return (NULL);
if (fstat(fd, &st) != 0)
goto fail;
size = st.st_size;
if ((buf = calloc(1, size + 1)) == NULL)
goto fail;
if (read(fd, buf, size) != size)
goto fail;
close(fd);
*len = size;
return (buf);
fail:
if (buf != NULL)
free(buf);
close(fd);
return (NULL);
}
void
ssl_error(const char *where)
{
unsigned long code;
char errbuf[128];
extern int debug;
if (!debug)
return;
for (; (code = ERR_get_error()) != 0 ;) {
ERR_error_string_n(code, errbuf, sizeof(errbuf));
logit(LOG_DEBUG, "SSL library error: %s: %s", where, errbuf);
}
}
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