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curl/lib/nss.c
Daniel Stenberg 50c10aa5bf Patrick Monnerat and I modified libcurl so that now it *copies* all strings 
passed to it with curl_easy_setopt()! Previously it has always just refered
to the data, forcing the user to keep the data around until libcurl is done
with it. That is now history and libcurl will instead clone the given
strings and keep private copies.
2007-08-01 21:20:01 +00:00

607 lines
17 KiB
C
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2007, 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.
*
* $Id$
***************************************************************************/
/*
* 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 "setup.h"
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#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"
#define _MPRINTF_REPLACE /* use the internal *printf() functions */
#include <curl/mprintf.h>
#ifdef USE_NSS
#include "nssg.h"
#include <nspr.h>
#include <nss.h>
#include <ssl.h>
#include <sslerr.h>
#include <secerr.h>
#include <sslproto.h>
#include <prtypes.h>
#include <pk11pub.h>
#include "memory.h"
#include "easyif.h" /* for Curl_convert_from_utf8 prototype */
/* The last #include file should be: */
#include "memdebug.h"
#ifndef min
#define min(a, b) ((a) < (b) ? (a) : (b))
#endif
PRFileDesc *PR_ImportTCPSocket(PRInt32 osfd);
static int initialized = 0;
static int noverify = 0;
#define HANDSHAKE_TIMEOUT 30
typedef struct {
PRInt32 retryCount;
struct SessionHandle *data;
} pphrase_arg_t;
typedef struct {
const char *name;
int num;
PRInt32 version; /* protocol version valid for this cipher */
} cipher_s;
/* the table itself is defined in nss_engine_init.c */
#ifdef NSS_ENABLE_ECC
#define ciphernum 48
#else
#define ciphernum 23
#endif
enum sslversion { SSL2 = 1, SSL3 = 2, TLS = 4 };
static const cipher_s cipherlist[ciphernum] = {
/* SSL2 cipher suites */
{"rc4", SSL_EN_RC4_128_WITH_MD5, SSL2},
{"rc4export", SSL_EN_RC4_128_EXPORT40_WITH_MD5, SSL2},
{"rc2", SSL_EN_RC2_128_CBC_WITH_MD5, SSL2},
{"rc2export", SSL_EN_RC2_128_CBC_EXPORT40_WITH_MD5, SSL2},
{"des", SSL_EN_DES_64_CBC_WITH_MD5, SSL2},
{"desede3", SSL_EN_DES_192_EDE3_CBC_WITH_MD5, SSL2},
/* SSL3/TLS cipher suites */
{"rsa_rc4_128_md5", SSL_RSA_WITH_RC4_128_MD5, SSL3 | TLS},
{"rsa_rc4_128_sha", SSL_RSA_WITH_RC4_128_SHA, SSL3 | TLS},
{"rsa_3des_sha", SSL_RSA_WITH_3DES_EDE_CBC_SHA, SSL3 | TLS},
{"rsa_des_sha", SSL_RSA_WITH_DES_CBC_SHA, SSL3 | TLS},
{"rsa_rc4_40_md5", SSL_RSA_EXPORT_WITH_RC4_40_MD5, SSL3 | TLS},
{"rsa_rc2_40_md5", SSL_RSA_EXPORT_WITH_RC2_CBC_40_MD5, SSL3 | TLS},
{"rsa_null_md5", SSL_RSA_WITH_NULL_MD5, SSL3 | TLS},
{"rsa_null_sha", SSL_RSA_WITH_NULL_SHA, SSL3 | TLS},
{"fips_3des_sha", SSL_RSA_FIPS_WITH_3DES_EDE_CBC_SHA, SSL3 | TLS},
{"fips_des_sha", SSL_RSA_FIPS_WITH_DES_CBC_SHA, SSL3 | TLS},
{"fortezza", SSL_FORTEZZA_DMS_WITH_FORTEZZA_CBC_SHA, SSL3 | TLS},
{"fortezza_rc4_128_sha", SSL_FORTEZZA_DMS_WITH_RC4_128_SHA, SSL3 | TLS},
{"fortezza_null", SSL_FORTEZZA_DMS_WITH_NULL_SHA, SSL3 | TLS},
/* TLS 1.0: Exportable 56-bit Cipher Suites. */
{"rsa_des_56_sha", TLS_RSA_EXPORT1024_WITH_DES_CBC_SHA, SSL3 | TLS},
{"rsa_rc4_56_sha", TLS_RSA_EXPORT1024_WITH_RC4_56_SHA, SSL3 | TLS},
/* AES ciphers. */
{"rsa_aes_128_sha", TLS_RSA_WITH_AES_128_CBC_SHA, SSL3 | TLS},
{"rsa_aes_256_sha", TLS_RSA_WITH_AES_256_CBC_SHA, SSL3 | TLS},
#ifdef NSS_ENABLE_ECC
/* ECC ciphers. */
{"ecdh_ecdsa_null_sha", TLS_ECDH_ECDSA_WITH_NULL_SHA, TLS},
{"ecdh_ecdsa_rc4_128_sha", TLS_ECDH_ECDSA_WITH_RC4_128_SHA, TLS},
{"ecdh_ecdsa_3des_sha", TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA, TLS},
{"ecdh_ecdsa_aes_128_sha", TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA, TLS},
{"ecdh_ecdsa_aes_256_sha", TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA, TLS},
{"ecdhe_ecdsa_null_sha", TLS_ECDHE_ECDSA_WITH_NULL_SHA, TLS},
{"ecdhe_ecdsa_rc4_128_sha", TLS_ECDHE_ECDSA_WITH_RC4_128_SHA, TLS},
{"ecdhe_ecdsa_3des_sha", TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA, TLS},
{"ecdhe_ecdsa_aes_128_sha", TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS},
{"ecdhe_ecdsa_aes_256_sha", TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS},
{"ecdh_rsa_null_sha", TLS_ECDH_RSA_WITH_NULL_SHA, TLS},
{"ecdh_rsa_128_sha", TLS_ECDH_RSA_WITH_RC4_128_SHA, TLS},
{"ecdh_rsa_3des_sha", TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA, TLS},
{"ecdh_rsa_aes_128_sha", TLS_ECDH_RSA_WITH_AES_128_CBC_SHA, TLS},
{"ecdh_rsa_aes_256_sha", TLS_ECDH_RSA_WITH_AES_256_CBC_SHA, TLS},
{"echde_rsa_null", TLS_ECDHE_RSA_WITH_NULL_SHA, TLS},
{"ecdhe_rsa_rc4_128_sha", TLS_ECDHE_RSA_WITH_RC4_128_SHA, TLS},
{"ecdhe_rsa_3des_sha", TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA, TLS},
{"ecdhe_rsa_aes_128_sha", TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, TLS},
{"ecdhe_rsa_aes_256_sha", TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, TLS},
{"ecdh_anon_null_sha", TLS_ECDH_anon_WITH_NULL_SHA, TLS},
{"ecdh_anon_rc4_128sha", TLS_ECDH_anon_WITH_RC4_128_SHA, TLS},
{"ecdh_anon_3des_sha", TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA, TLS},
{"ecdh_anon_aes_128_sha", TLS_ECDH_anon_WITH_AES_128_CBC_SHA, TLS},
{"ecdh_anon_aes_256_sha", TLS_ECDH_anon_WITH_AES_256_CBC_SHA, TLS},
#endif
};
static SECStatus set_ciphers(struct SessionHandle *data, PRFileDesc * model,
char *cipher_list)
{
int i;
PRBool cipher_state[ciphernum];
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
*/
for(i=0; i<SSL_NumImplementedCiphers; i++) {
SSL_CipherPrefSet(model, SSL_ImplementedCiphers[i], SSL_NOT_ALLOWED);
}
/* Set every entry in our list to false */
for(i=0; i<ciphernum; i++) {
cipher_state[i] = PR_FALSE;
}
cipher = cipher_list;
while(cipher_list && (cipher_list[0])) {
while((*cipher) && (ISSPACE(*cipher)))
++cipher;
if((cipher_list = strchr(cipher, ','))) {
*cipher_list++ = '\0';
}
found = PR_FALSE;
for(i=0; i<ciphernum; i++) {
if(!strcasecmp(cipher, cipherlist[i].name)) {
cipher_state[i] = PR_TRUE;
found = PR_TRUE;
break;
}
}
if(found == PR_FALSE) {
char buf[1024];
snprintf(buf, 1024, "Unknown cipher in list: %s", cipher);
failf(data, buf);
return SECFailure;
}
if(cipher_list) {
cipher = cipher_list;
}
}
/* Finally actually enable the selected ciphers */
for(i=0; i<ciphernum; i++) {
rv = SSL_CipherPrefSet(model, cipherlist[i].num, cipher_state[i]);
if(rv != SECSuccess) {
failf(data, "Unknown cipher in cipher list");
return SECFailure;
}
}
return SECSuccess;
}
static char * nss_get_password(PK11SlotInfo * slot, PRBool retry, void *arg)
{
pphrase_arg_t *parg = (pphrase_arg_t *) arg;
(void)slot; /* unused */
(void)retry; /* unused */
if(parg->data->set.str[STRING_KEY_PASSWD])
return (char *)PORT_Strdup((char *)parg->data->set.str[STRING_KEY_PASSWD]);
else
return NULL;
}
static SECStatus nss_Init_Tokens(struct connectdata * conn)
{
PK11SlotList *slotList;
PK11SlotListElement *listEntry;
SECStatus ret, status = SECSuccess;
pphrase_arg_t *parg;
parg = (pphrase_arg_t *) malloc(sizeof(*parg));
parg->retryCount = 0;
parg->data = conn->data;
PK11_SetPasswordFunc(nss_get_password);
slotList =
PK11_GetAllTokens(CKM_INVALID_MECHANISM, PR_FALSE, PR_TRUE, NULL);
for(listEntry = PK11_GetFirstSafe(slotList);
listEntry; listEntry = listEntry->next) {
PK11SlotInfo *slot = listEntry->slot;
if(PK11_NeedLogin(slot) && PK11_NeedUserInit(slot)) {
if(slot == PK11_GetInternalKeySlot()) {
failf(conn->data, "The NSS database has not been initialized.\n");
}
else {
failf(conn->data, "The token %s has not been initialized.",
PK11_GetTokenName(slot));
}
PK11_FreeSlot(slot);
continue;
}
ret = PK11_Authenticate(slot, PR_TRUE, parg);
if(SECSuccess != ret) {
status = SECFailure;
break;
}
parg->retryCount = 0; /* reset counter to 0 for the next token */
PK11_FreeSlot(slot);
}
free(parg);
return status;
}
static SECStatus BadCertHandler(void *arg, PRFileDesc * socket)
{
SECStatus success = SECSuccess;
(void)arg;
(void)socket;
return success;
}
/**
* Inform the application that the handshake is complete.
*/
static SECStatus HandshakeCallback(PRFileDesc * socket, void *arg)
{
(void)socket;
(void)arg;
return SECSuccess;
}
/**
*
* Callback to pick the SSL client certificate.
*/
static SECStatus SelectClientCert(void *arg, PRFileDesc * socket,
struct CERTDistNamesStr * caNames,
struct CERTCertificateStr ** pRetCert,
struct SECKEYPrivateKeyStr ** pRetKey)
{
CERTCertificate *cert;
SECKEYPrivateKey *privKey;
char *nickname = (char *)arg;
void *proto_win = NULL;
SECStatus secStatus = SECFailure;
(void)caNames;
proto_win = SSL_RevealPinArg(socket);
cert = PK11_FindCertFromNickname(nickname, proto_win);
if(cert) {
privKey = PK11_FindKeyByAnyCert(cert, proto_win);
if(privKey) {
secStatus = SECSuccess;
}
else {
CERT_DestroyCertificate(cert);
}
}
if(secStatus == SECSuccess) {
*pRetCert = cert;
*pRetKey = privKey;
}
return secStatus;
}
/**
* Global SSL init
*
* @retval 0 error initializing SSL
* @retval 1 SSL initialized successfully
*/
int Curl_nss_init(void)
{
if(!initialized)
PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 256);
/* We will actually initialize NSS later */
return 1;
}
/* Global cleanup */
void Curl_nss_cleanup(void)
{
NSS_Shutdown();
initialized = 0;
}
/*
* This function uses SSL_peek to determine connection status.
*
* Return codes:
* 1 means the connection is still in place
* 0 means the connection has been closed
* -1 means the connection status is unknown
*/
int
Curl_nss_check_cxn(struct connectdata *conn)
{
int rc;
char buf;
rc =
PR_Recv(conn->ssl[FIRSTSOCKET].handle, (void *)&buf, 1, PR_MSG_PEEK,
PR_SecondsToInterval(1));
if(rc > 0)
return 1; /* connection still in place */
if(rc == 0)
return 0; /* connection has been closed */
return -1; /* connection status unknown */
}
/*
* This function is called when an SSL connection is closed.
*/
void Curl_nss_close(struct connectdata *conn, int sockindex)
{
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
if(connssl->handle) {
PR_Close(connssl->handle);
connssl->handle = NULL;
}
}
/*
* This function is called when the 'data' struct is going away. Close
* down everything and free all resources!
*/
int Curl_nss_close_all(struct SessionHandle *data)
{
(void)data;
return 0;
}
CURLcode Curl_nss_connect(struct connectdata * conn, int sockindex)
{
PRInt32 err;
PRFileDesc *model = NULL;
PRBool ssl2, ssl3, tlsv1;
struct SessionHandle *data = conn->data;
curl_socket_t sockfd = conn->sock[sockindex];
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
SECStatus rv;
int curlerr = CURLE_SSL_CONNECT_ERROR;
/* FIXME. NSS doesn't support multiple databases open at the same time. */
if(!initialized) {
if(!data->set.ssl.CAfile) {
if(data->set.ssl.verifypeer) {
failf(data, "No NSS cacert database specified.");
return CURLE_SSL_CACERT_BADFILE;
}
else {
rv = NSS_NoDB_Init(NULL);
noverify = 1;
}
}
else {
rv = NSS_Initialize(data->set.ssl.CAfile, NULL, NULL, "secmod.db",
NSS_INIT_READONLY);
}
if(rv != SECSuccess) {
curlerr = CURLE_SSL_CACERT_BADFILE;
goto error;
}
}
NSS_SetDomesticPolicy();
model = PR_NewTCPSocket();
if(!model)
goto error;
model = SSL_ImportFD(NULL, model);
if(SSL_OptionSet(model, SSL_SECURITY, PR_TRUE) != SECSuccess)
goto error;
if(SSL_OptionSet(model, SSL_HANDSHAKE_AS_SERVER, PR_FALSE) != SECSuccess)
goto error;
if(SSL_OptionSet(model, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE) != SECSuccess)
goto error;
ssl2 = ssl3 = tlsv1 = PR_FALSE;
switch (data->set.ssl.version) {
default:
case CURL_SSLVERSION_DEFAULT:
ssl2 = ssl3 = tlsv1 = PR_TRUE;
break;
case CURL_SSLVERSION_TLSv1:
tlsv1 = PR_TRUE;
break;
case CURL_SSLVERSION_SSLv2:
ssl2 = PR_TRUE;
break;
case CURL_SSLVERSION_SSLv3:
ssl3 = PR_TRUE;
break;
}
if(SSL_OptionSet(model, SSL_ENABLE_SSL2, ssl2) != SECSuccess)
goto error;
if(SSL_OptionSet(model, SSL_ENABLE_SSL3, ssl3) != SECSuccess)
goto error;
if(SSL_OptionSet(model, SSL_ENABLE_TLS, tlsv1) != SECSuccess)
goto error;
if(data->set.ssl.cipher_list) {
if(set_ciphers(data, model, data->set.ssl.cipher_list) != SECSuccess)
goto error;
}
if(SSL_BadCertHook(model, (SSLBadCertHandler) BadCertHandler, NULL)
!= SECSuccess)
goto error;
if(SSL_HandshakeCallback(model, (SSLHandshakeCallback) HandshakeCallback,
NULL) != SECSuccess)
goto error;
if(data->set.str[STRING_CERT]) {
if(SSL_GetClientAuthDataHook(model,
(SSLGetClientAuthData) SelectClientCert,
(void *)data->set.str[STRING_CERT]) !=
SECSuccess) {
curlerr = CURLE_SSL_CERTPROBLEM;
goto error;
}
if(nss_Init_Tokens(conn) != SECSuccess)
goto error;
}
/* Import our model socket onto the existing file descriptor */
connssl->handle = PR_ImportTCPSocket(sockfd);
connssl->handle = SSL_ImportFD(model, connssl->handle);
if(!connssl->handle)
goto error;
/* Force handshake on next I/O */
SSL_ResetHandshake(connssl->handle, /* asServer */ PR_FALSE);
SSL_SetURL(connssl->handle, conn->host.name);
/* Force the handshake now */
if (SSL_ForceHandshakeWithTimeout(connssl->handle,
PR_SecondsToInterval(HANDSHAKE_TIMEOUT))
!= SECSuccess)
goto error;
return CURLE_OK;
error:
err = PR_GetError();
failf(data, "NSS error %d", err);
if(model)
PR_Close(model);
return curlerr;
}
/* return number of sent (non-SSL) bytes */
int Curl_nss_send(struct connectdata *conn, /* connection data */
int sockindex, /* socketindex */
void *mem, /* send this data */
size_t len) /* amount to write */
{
PRInt32 err;
struct SessionHandle *data = conn->data;
PRInt32 timeout;
int rc;
if(data->set.timeout)
timeout = PR_MillisecondsToInterval(data->set.timeout);
else
timeout = PR_MillisecondsToInterval(DEFAULT_CONNECT_TIMEOUT);
rc = PR_Send(conn->ssl[sockindex].handle, mem, (int)len, 0, timeout);
if(rc < 0) {
err = PR_GetError();
if(err == PR_IO_TIMEOUT_ERROR) {
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEOUTED;
}
failf(conn->data, "SSL write: error %d\n", err);
return -1;
}
return rc; /* number of bytes */
}
/*
* If the read would block we return -1 and set 'wouldblock' to TRUE.
* Otherwise we return the amount of data read. Other errors should return -1
* and set 'wouldblock' to FALSE.
*/
ssize_t Curl_nss_recv(struct connectdata * conn, /* connection data */
int num, /* socketindex */
char *buf, /* store read data here */
size_t buffersize, /* max amount to read */
bool * wouldblock)
{
ssize_t nread;
struct SessionHandle *data = conn->data;
PRInt32 timeout;
if(data->set.timeout)
timeout = PR_SecondsToInterval(data->set.timeout);
else
timeout = PR_MillisecondsToInterval(DEFAULT_CONNECT_TIMEOUT);
nread = PR_Recv(conn->ssl[num].handle, buf, (int)buffersize, 0, timeout);
*wouldblock = FALSE;
if(nread < 0) {
/* failed SSL read */
PRInt32 err = PR_GetError();
if(err == PR_WOULD_BLOCK_ERROR) {
*wouldblock = TRUE;
return -1; /* basically EWOULDBLOCK */
}
if(err == PR_IO_TIMEOUT_ERROR) {
failf(data, "SSL connection timeout");
return CURLE_OPERATION_TIMEOUTED;
}
failf(conn->data, "SSL read: errno %d", err);
return -1;
}
return nread;
}
size_t Curl_nss_version(char *buffer, size_t size)
{
return snprintf(buffer, size, " NSS/%s", NSS_VERSION);
}
#endif /* USE_NSS */
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