nss.c

/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
 *
 * This software is licensed as described in the file COPYING, which
 * you should have received as part of this distribution. The terms
 * are also available at http://curl.haxx.se/docs/copyright.html.
 *
 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
 * copies of the Software, and permit persons to whom the Software is
 * furnished to do so, under the terms of the COPYING file.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ***************************************************************************/

/*
 * Source file for all NSS-specific code for the TLS/SSL layer. No code
 * but sslgen.c should ever call or use these functions.
 */

#include "curl_setup.h"

#ifdef USE_NSS

#include "urldata.h"
#include "sendf.h"
#include "formdata.h" /* for the boundary function */
#include "url.h" /* for the ssl config check function */
#include "connect.h"
#include "strequal.h"
#include "select.h"
#include "sslgen.h"
#include "llist.h"

#define _MPRINTF_REPLACE /* use the internal *printf() functions */
#include <curl/mprintf.h>

#include "nssg.h"
#include <nspr.h>
#include <nss.h>
#include <ssl.h>
#include <sslerr.h>
#include <secerr.h>
#include <secmod.h>
#include <sslproto.h>
#include <prtypes.h>
#include <pk11pub.h>
#include <prio.h>
#include <secitem.h>
#include <secport.h>
#include <certdb.h>
#include <base64.h>
#include <cert.h>
#include <prerror.h>

#include "curl_memory.h"
#include "rawstr.h"
#include "warnless.h"

/* The last #include file should be: */
#include "memdebug.h"

#define SSL_DIR "/etc/pki/nssdb"

/* enough to fit the string "PEM Token #[0|1]" */
#define SLOTSIZE 13

PRFileDesc *PR_ImportTCPSocket(PRInt32 osfd);

PRLock * nss_initlock = NULL;
PRLock * nss_crllock = NULL;
#ifdef HAVE_NSS_INITCONTEXT
NSSInitContext * nss_context = NULL;
#endif

volatile int initialized = 0;

typedef struct {
  const char *name;
  int num;
} cipher_s;

#define PK11_SETATTRS(_attr, _idx, _type, _val, _len) do {  \
  CK_ATTRIBUTE *ptr = (_attr) + ((_idx)++);                 \
  ptr->type = (_type);                                      \
  ptr->pValue = (_val);                                     \
  ptr->ulValueLen = (_len);                                 \
} WHILE_FALSE

#define CERT_NewTempCertificate __CERT_NewTempCertificate

#define NUM_OF_CIPHERS sizeof(cipherlist)/sizeof(cipherlist[0])
static const cipher_s cipherlist[] = {
  /* SSL2 cipher suites */
  {"rc4",                        SSL_EN_RC4_128_WITH_MD5},
  {"rc4-md5",                    SSL_EN_RC4_128_WITH_MD5},
  {"rc4export",                  SSL_EN_RC4_128_EXPORT40_WITH_MD5},
  {"rc2",                        SSL_EN_RC2_128_CBC_WITH_MD5},
  {"rc2export",                  SSL_EN_RC2_128_CBC_EXPORT40_WITH_MD5},
  {"des",                        SSL_EN_DES_64_CBC_WITH_MD5},
  {"desede3",                    SSL_EN_DES_192_EDE3_CBC_WITH_MD5},
  /* SSL3/TLS cipher suites */
  {"rsa_rc4_128_md5",            SSL_RSA_WITH_RC4_128_MD5},
  {"rsa_rc4_128_sha",            SSL_RSA_WITH_RC4_128_SHA},
  {"rsa_3des_sha",               SSL_RSA_WITH_3DES_EDE_CBC_SHA},
  {"rsa_des_sha",                SSL_RSA_WITH_DES_CBC_SHA},
  {"rsa_rc4_40_md5",             SSL_RSA_EXPORT_WITH_RC4_40_MD5},
  {"rsa_rc2_40_md5",             SSL_RSA_EXPORT_WITH_RC2_CBC_40_MD5},
  {"rsa_null_md5",               SSL_RSA_WITH_NULL_MD5},
  {"rsa_null_sha",               SSL_RSA_WITH_NULL_SHA},
  {"fips_3des_sha",              SSL_RSA_FIPS_WITH_3DES_EDE_CBC_SHA},
  {"fips_des_sha",               SSL_RSA_FIPS_WITH_DES_CBC_SHA},
  {"fortezza",                   SSL_FORTEZZA_DMS_WITH_FORTEZZA_CBC_SHA},
  {"fortezza_rc4_128_sha",       SSL_FORTEZZA_DMS_WITH_RC4_128_SHA},
  {"fortezza_null",              SSL_FORTEZZA_DMS_WITH_NULL_SHA},
  /* TLS 1.0: Exportable 56-bit Cipher Suites. */
  {"rsa_des_56_sha",             TLS_RSA_EXPORT1024_WITH_DES_CBC_SHA},
  {"rsa_rc4_56_sha",             TLS_RSA_EXPORT1024_WITH_RC4_56_SHA},
  /* AES ciphers. */
  {"rsa_aes_128_sha",            TLS_RSA_WITH_AES_128_CBC_SHA},
  {"rsa_aes_256_sha",            TLS_RSA_WITH_AES_256_CBC_SHA},
#ifdef NSS_ENABLE_ECC
  /* ECC ciphers. */
  {"ecdh_ecdsa_null_sha",        TLS_ECDH_ECDSA_WITH_NULL_SHA},
  {"ecdh_ecdsa_rc4_128_sha",     TLS_ECDH_ECDSA_WITH_RC4_128_SHA},
  {"ecdh_ecdsa_3des_sha",        TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA},
  {"ecdh_ecdsa_aes_128_sha",     TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA},
  {"ecdh_ecdsa_aes_256_sha",     TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA},
  {"ecdhe_ecdsa_null_sha",       TLS_ECDHE_ECDSA_WITH_NULL_SHA},
  {"ecdhe_ecdsa_rc4_128_sha",    TLS_ECDHE_ECDSA_WITH_RC4_128_SHA},
  {"ecdhe_ecdsa_3des_sha",       TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA},
  {"ecdhe_ecdsa_aes_128_sha",    TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA},
  {"ecdhe_ecdsa_aes_256_sha",    TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA},
  {"ecdh_rsa_null_sha",          TLS_ECDH_RSA_WITH_NULL_SHA},
  {"ecdh_rsa_128_sha",           TLS_ECDH_RSA_WITH_RC4_128_SHA},
  {"ecdh_rsa_3des_sha",          TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA},
  {"ecdh_rsa_aes_128_sha",       TLS_ECDH_RSA_WITH_AES_128_CBC_SHA},
  {"ecdh_rsa_aes_256_sha",       TLS_ECDH_RSA_WITH_AES_256_CBC_SHA},
  {"echde_rsa_null",             TLS_ECDHE_RSA_WITH_NULL_SHA},
  {"ecdhe_rsa_rc4_128_sha",      TLS_ECDHE_RSA_WITH_RC4_128_SHA},
  {"ecdhe_rsa_3des_sha",         TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA},
  {"ecdhe_rsa_aes_128_sha",      TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA},
  {"ecdhe_rsa_aes_256_sha",      TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA},
  {"ecdh_anon_null_sha",         TLS_ECDH_anon_WITH_NULL_SHA},
  {"ecdh_anon_rc4_128sha",       TLS_ECDH_anon_WITH_RC4_128_SHA},
  {"ecdh_anon_3des_sha",         TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA},
  {"ecdh_anon_aes_128_sha",      TLS_ECDH_anon_WITH_AES_128_CBC_SHA},
  {"ecdh_anon_aes_256_sha",      TLS_ECDH_anon_WITH_AES_256_CBC_SHA},
#endif
};

/* following ciphers are new in NSS 3.4 and not enabled by default, therefore
   they are enabled explicitly */
static const int enable_ciphers_by_default[] = {
  TLS_DHE_DSS_WITH_AES_128_CBC_SHA,
  TLS_DHE_DSS_WITH_AES_256_CBC_SHA,
  TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
  TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
  TLS_RSA_WITH_AES_128_CBC_SHA,
  TLS_RSA_WITH_AES_256_CBC_SHA,
  SSL_NULL_WITH_NULL_NULL
};

static const char* pem_library = "libnsspem.so";
SECMODModule* mod = NULL;

static const char* nss_error_to_name(PRErrorCode code)
{
  const char *name = PR_ErrorToName(code);
  if(name)
    return name;

  return "unknown error";
}

static void nss_print_error_message(struct SessionHandle *data, PRUint32 err)
{
  failf(data, "%s", PR_ErrorToString(err, PR_LANGUAGE_I_DEFAULT));
}

static SECStatus set_ciphers(struct SessionHandle *data, PRFileDesc * model,
                             char *cipher_list)
{
  unsigned int i;
  PRBool cipher_state[NUM_OF_CIPHERS];
  PRBool found;
  char *cipher;
  SECStatus rv;

  /* First disable all ciphers. This uses a different max value in case
   * NSS adds more ciphers later we don't want them available by
   * accident
   */