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curl/lib/nss.c
Kamil Dudka 571309dc3e - libcurl-NSS now tries to reconnect with TLS disabled in case it detects 
a broken TLS server. However it does not happen if SSL version is selected
  manually. The approach was originally taken from PSM. Kaspar Brand helped me
  to complete the patch. Original bug reports:
  https://bugzilla.redhat.com/525496
  https://bugzilla.redhat.com/527771
2009-11-12 11:16:31 +00:00

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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2009, 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 <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 "curl_memory.h"
#include "rawstr.h"
#include "easyif.h" /* for Curl_convert_from_utf8 prototype */
/* 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;
volatile int initialized = 0;
typedef struct {
const char *name;
int num;
PRInt32 version; /* protocol version valid for this cipher */
} cipher_s;
#define PK11_SETATTRS(x,id,v,l) (x)->type = (id); \
(x)->pValue=(v); (x)->ulValueLen = (l)
#define CERT_NewTempCertificate __CERT_NewTempCertificate
enum sslversion { SSL2 = 1, SSL3 = 2, TLS = 4 };
#define NUM_OF_CIPHERS sizeof(cipherlist)/sizeof(cipherlist[0])
static const cipher_s cipherlist[] = {
/* SSL2 cipher suites */
{"rc4", SSL_EN_RC4_128_WITH_MD5, SSL2},
{"rc4-md5", 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
};
/* 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
};
#ifdef HAVE_PK11_CREATEGENERICOBJECT
static const char* pem_library = "libnsspem.so";
#endif
SECMODModule* mod = NULL;
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
*/
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<NUM_OF_CIPHERS; 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<NUM_OF_CIPHERS; i++) {
if(Curl_raw_equal(cipher, cipherlist[i].name)) {
cipher_state[i] = PR_TRUE;
found = PR_TRUE;
break;
}
}
if(found == PR_FALSE) {
failf(data, "Unknown cipher in list: %s", cipher);
return SECFailure;
}
if(cipher_list) {
cipher = cipher_list;
}
}
/* Finally actually enable the selected ciphers */
for(i=0; i<NUM_OF_CIPHERS; 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;
}
/*
* Get the number of ciphers that are enabled. We use this to determine
* if we need to call NSS_SetDomesticPolicy() to enable the default ciphers.
*/
static int num_enabled_ciphers(void)
{
PRInt32 policy = 0;
int count = 0;
unsigned int i;
for(i=0; i<NUM_OF_CIPHERS; i++) {
SSL_CipherPolicyGet(cipherlist[i].num, &policy);
if(policy)
count++;
}
return count;
}
/*
* Determine whether the nickname passed in is a filename that needs to
* be loaded as a PEM or a regular NSS nickname.
*
* returns 1 for a file
* returns 0 for not a file (NSS nickname)
*/
static int is_file(const char *filename)
{
struct_stat st;
if(filename == NULL)
return 0;
if(stat(filename, &st) == 0)
if(S_ISREG(st.st_mode))
return 1;
return 0;
}
static char *fmt_nickname(char *str, bool *nickname_alloc)
{
char *nickname = NULL;
*nickname_alloc = FALSE;
if(is_file(str)) {
char *n = strrchr(str, '/');
if(n) {
*nickname_alloc = TRUE;
n++; /* skip last slash */
nickname = aprintf("PEM Token #%d:%s", 1, n);
}
return nickname;
}
return str;
}
static int nss_load_cert(struct ssl_connect_data *ssl,
const char *filename, PRBool cacert)
{
#ifdef HAVE_PK11_CREATEGENERICOBJECT
CK_SLOT_ID slotID;
PK11SlotInfo * slot = NULL;
CK_ATTRIBUTE *attrs;
CK_ATTRIBUTE theTemplate[20];
CK_BBOOL cktrue = CK_TRUE;
CK_BBOOL ckfalse = CK_FALSE;
CK_OBJECT_CLASS objClass = CKO_CERTIFICATE;
char slotname[SLOTSIZE];
#endif
CERTCertificate *cert;
char *nickname = NULL;
char *n = NULL;
/* If there is no slash in the filename it is assumed to be a regular
* NSS nickname.
*/
if(is_file(filename)) {
n = strrchr(filename, '/');
if(n)
n++;
if(!mod)
return 1;
}
else {
/* A nickname from the NSS internal database */
if(cacert)
return 0; /* You can't specify an NSS CA nickname this way */
nickname = strdup(filename);
if(!nickname)
return 0;
goto done;
}
#ifdef HAVE_PK11_CREATEGENERICOBJECT
attrs = theTemplate;
/* All CA and trust objects go into slot 0. Other slots are used
* for storing certificates. With each new user certificate we increment
* the slot count. We only support 1 user certificate right now.
*/
if(cacert)
slotID = 0;
else
slotID = 1;
snprintf(slotname, SLOTSIZE, "PEM Token #%ld", slotID);
nickname = aprintf("PEM Token #%ld:%s", slotID, n);
if(!nickname)
return 0;
slot = PK11_FindSlotByName(slotname);
if(!slot) {
free(nickname);
return 0;
}
PK11_SETATTRS(attrs, CKA_CLASS, &objClass, sizeof(objClass) );
attrs++;
PK11_SETATTRS(attrs, CKA_TOKEN, &cktrue, sizeof(CK_BBOOL) );
attrs++;
PK11_SETATTRS(attrs, CKA_LABEL, (unsigned char *)filename,
strlen(filename)+1);
attrs++;
if(cacert) {
PK11_SETATTRS(attrs, CKA_TRUST, &cktrue, sizeof(CK_BBOOL) );
}
else {
PK11_SETATTRS(attrs, CKA_TRUST, &ckfalse, sizeof(CK_BBOOL) );
}
attrs++;
/* This load the certificate in our PEM module into the appropriate
* slot.
*/
ssl->cacert[slotID] = PK11_CreateGenericObject(slot, theTemplate, 4,
PR_FALSE /* isPerm */);
PK11_FreeSlot(slot);
if(ssl->cacert[slotID] == NULL) {
free(nickname);
return 0;
}
#else
/* We don't have PK11_CreateGenericObject but a file-based cert was passed
* in. We need to fail.
*/
return 0;
#endif
done:
/* Double-check that the certificate or nickname requested exists in
* either the token or the NSS certificate database.
*/
if(!cacert) {
cert = PK11_FindCertFromNickname((char *)nickname, NULL);
/* An invalid nickname was passed in */
if(cert == NULL) {
free(nickname);
PR_SetError(SEC_ERROR_UNKNOWN_CERT, 0);
return 0;
}
CERT_DestroyCertificate(cert);
}
free(nickname);
return 1;
}
static int nss_load_crl(const char* crlfilename, PRBool ascii)
{
PRFileDesc *infile;
PRStatus prstat;
PRFileInfo info;
PRInt32 nb;
int rv;
SECItem crlDER;
CERTSignedCrl *crl=NULL;
PK11SlotInfo *slot=NULL;
infile = PR_Open(crlfilename,PR_RDONLY,0);
if (!infile) {
return 0;
}
crlDER.data = NULL;
prstat = PR_GetOpenFileInfo(infile,&info);
if (prstat!=PR_SUCCESS)
return 0;
if (ascii) {
SECItem filedata;
char *asc,*body;
filedata.data = NULL;
if (!SECITEM_AllocItem(NULL,&filedata,info.size))
return 0;
nb = PR_Read(infile,filedata.data,info.size);
if (nb!=info.size)
return 0;
asc = (char*)filedata.data;
if (!asc)
return 0;
body=strstr(asc,"-----BEGIN");
if (body != NULL) {
char *trailer=NULL;
asc = body;
body = PORT_Strchr(asc,'\n');
if (!body)
body = PORT_Strchr(asc,'\r');
if (body)
trailer = strstr(++body,"-----END");
if (trailer!=NULL)
*trailer='\0';
else
return 0;
}
else {
body = asc;
}
rv = ATOB_ConvertAsciiToItem(&crlDER,body);
PORT_Free(filedata.data);
if (rv)
return 0;
}
else {
if (!SECITEM_AllocItem(NULL,&crlDER,info.size))
return 0;
nb = PR_Read(infile,crlDER.data,info.size);
if (nb!=info.size)
return 0;
}
slot = PK11_GetInternalKeySlot();
crl = PK11_ImportCRL(slot,&crlDER,
NULL,SEC_CRL_TYPE,
NULL,CRL_IMPORT_DEFAULT_OPTIONS,
NULL,(CRL_DECODE_DEFAULT_OPTIONS|
CRL_DECODE_DONT_COPY_DER));
if (slot) PK11_FreeSlot(slot);
if (!crl) return 0;
SEC_DestroyCrl(crl);
return 1;
}
static int nss_load_key(struct connectdata *conn, int sockindex, char *key_file)
{
#ifdef HAVE_PK11_CREATEGENERICOBJECT
PK11SlotInfo * slot = NULL;
CK_ATTRIBUTE *attrs;
CK_ATTRIBUTE theTemplate[20];
CK_BBOOL cktrue = CK_TRUE;
CK_OBJECT_CLASS objClass = CKO_PRIVATE_KEY;
CK_SLOT_ID slotID;
char slotname[SLOTSIZE];
struct ssl_connect_data *sslconn = &conn->ssl[sockindex];
attrs = theTemplate;
/* FIXME: grok the various file types */
slotID = 1; /* hardcoded for now */
snprintf(slotname, sizeof(slotname), "PEM Token #%ld", slotID);
slot = PK11_FindSlotByName(slotname);
if(!slot)
return 0;
PK11_SETATTRS(attrs, CKA_CLASS, &objClass, sizeof(objClass) ); attrs++;
PK11_SETATTRS(attrs, CKA_TOKEN, &cktrue, sizeof(CK_BBOOL) ); attrs++;
PK11_SETATTRS(attrs, CKA_LABEL, (unsigned char *)key_file,
strlen(key_file)+1); attrs++;
/* When adding an encrypted key the PKCS#11 will be set as removed */
sslconn->key = PK11_CreateGenericObject(slot, theTemplate, 3,
PR_FALSE /* isPerm */);
if(sslconn->key == NULL) {
PR_SetError(SEC_ERROR_BAD_KEY, 0);
return 0;
}
/* This will force the token to be seen as re-inserted */
SECMOD_WaitForAnyTokenEvent(mod, 0, 0);
PK11_IsPresent(slot);
/* parg is initialized in nss_Init_Tokens() */
if(PK11_Authenticate(slot, PR_TRUE,
conn->data->set.str[STRING_KEY_PASSWD]) != SECSuccess) {
PK11_FreeSlot(slot);
return 0;
}
PK11_FreeSlot(slot);
return 1;
#else
/* If we don't have PK11_CreateGenericObject then we can't load a file-based
* key.
*/
(void)conn; /* unused */
(void)key_file; /* unused */
return 0;
#endif
}
static int display_error(struct connectdata *conn, PRInt32 err,
const char *filename)
{
switch(err) {
case SEC_ERROR_BAD_PASSWORD:
failf(conn->data, "Unable to load client key: Incorrect password");
return 1;
case SEC_ERROR_UNKNOWN_CERT:
failf(conn->data, "Unable to load certificate %s", filename);
return 1;
default:
break;
}
return 0; /* The caller will print a generic error */
}
static int cert_stuff(struct connectdata *conn,
int sockindex, char *cert_file, char *key_file)
{
struct SessionHandle *data = conn->data;
int rv = 0;
if(cert_file) {
rv = nss_load_cert(&conn->ssl[sockindex], cert_file, PR_FALSE);
if(!rv) {
if(!display_error(conn, PR_GetError(), cert_file))
failf(data, "Unable to load client cert %d.", PR_GetError());
return 0;
}
}
if(key_file || (is_file(cert_file))) {
if(key_file)
rv = nss_load_key(conn, sockindex, key_file);
else
/* In case the cert file also has the key */
rv = nss_load_key(conn, sockindex, cert_file);
if(!rv) {
if(!display_error(conn, PR_GetError(), key_file))
failf(data, "Unable to load client key %d.", PR_GetError());
return 0;
}
}
return 1;
}
static char * nss_get_password(PK11SlotInfo * slot, PRBool retry, void *arg)
{
(void)slot; /* unused */
if(retry || NULL == arg)
return NULL;
else
return (char *)PORT_Strdup((char *)arg);
}
static SECStatus BadCertHandler(void *arg, PRFileDesc *sock)
{
SECStatus success = SECSuccess;
struct connectdata *conn = (struct connectdata *)arg;
PRErrorCode err = PR_GetError();
CERTCertificate *cert = NULL;
char *subject, *subject_cn, *issuer;
if(conn->data->set.ssl.certverifyresult!=0)
return success;
conn->data->set.ssl.certverifyresult=err;
cert = SSL_PeerCertificate(sock);
subject = CERT_NameToAscii(&cert->subject);
subject_cn = CERT_GetCommonName(&cert->subject);
issuer = CERT_NameToAscii(&cert->issuer);
CERT_DestroyCertificate(cert);
switch(err) {
case SEC_ERROR_CA_CERT_INVALID:
infof(conn->data, "Issuer certificate is invalid: '%s'\n", issuer);
if(conn->data->set.ssl.verifypeer)
success = SECFailure;
break;
case SEC_ERROR_UNTRUSTED_ISSUER:
if(conn->data->set.ssl.verifypeer)
success = SECFailure;
infof(conn->data, "Certificate is signed by an untrusted issuer: '%s'\n",
issuer);
break;
case SSL_ERROR_BAD_CERT_DOMAIN:
if(conn->data->set.ssl.verifyhost) {
failf(conn->data, "SSL: certificate subject name '%s' does not match "
"target host name '%s'", subject_cn, conn->host.dispname);
success = SECFailure;
} else {
infof(conn->data, "warning: SSL: certificate subject name '%s' does not "
"match target host name '%s'\n", subject_cn, conn->host.dispname);
}
break;
case SEC_ERROR_EXPIRED_CERTIFICATE:
if(conn->data->set.ssl.verifypeer)
success = SECFailure;
infof(conn->data, "Remote Certificate has expired.\n");
break;
case SEC_ERROR_UNKNOWN_ISSUER:
if(conn->data->set.ssl.verifypeer)
success = SECFailure;
infof(conn->data, "Peer's certificate issuer is not recognized: '%s'\n",
issuer);
break;
default:
if(conn->data->set.ssl.verifypeer)
success = SECFailure;
infof(conn->data, "Bad certificate received. Subject = '%s', "
"Issuer = '%s'\n", subject, issuer);
break;
}
if(success == SECSuccess)
infof(conn->data, "SSL certificate verify ok.\n");
PR_Free(subject);
PR_Free(subject_cn);
PR_Free(issuer);
return success;
}
/**
* Inform the application that the handshake is complete.
*/
static SECStatus HandshakeCallback(PRFileDesc *sock, void *arg)
{
(void)sock;
(void)arg;
return SECSuccess;
}
static void display_cert_info(struct SessionHandle *data, CERTCertificate *cert) {
char *subject, *issuer, *common_name;
PRExplodedTime printableTime;
char timeString[256];
PRTime notBefore, notAfter;
subject = CERT_NameToAscii(&cert->subject);
issuer = CERT_NameToAscii(&cert->issuer);
common_name = CERT_GetCommonName(&cert->subject);
infof(data, "\tsubject: %s\n", subject);
CERT_GetCertTimes(cert, &notBefore, &notAfter);
PR_ExplodeTime(notBefore, PR_GMTParameters, &printableTime);
PR_FormatTime(timeString, 256, "%b %d %H:%M:%S %Y GMT", &printableTime);
infof(data, "\tstart date: %s\n", timeString);
PR_ExplodeTime(notAfter, PR_GMTParameters, &printableTime);
PR_FormatTime(timeString, 256, "%b %d %H:%M:%S %Y GMT", &printableTime);
infof(data, "\texpire date: %s\n", timeString);
infof(data, "\tcommon name: %s\n", common_name);
infof(data, "\tissuer: %s\n", issuer);
PR_Free(subject);
PR_Free(issuer);
PR_Free(common_name);
}
static void display_conn_info(struct connectdata *conn, PRFileDesc *sock)
{
SSLChannelInfo channel;
SSLCipherSuiteInfo suite;
CERTCertificate *cert;
if(SSL_GetChannelInfo(sock, &channel, sizeof channel) ==
SECSuccess && channel.length == sizeof channel &&
channel.cipherSuite) {
if(SSL_GetCipherSuiteInfo(channel.cipherSuite,
&suite, sizeof suite) == SECSuccess) {
infof(conn->data, "SSL connection using %s\n", suite.cipherSuiteName);
}
}
infof(conn->data, "Server certificate:\n");
cert = SSL_PeerCertificate(sock);
display_cert_info(conn->data, cert);
CERT_DestroyCertificate(cert);
return;
}
/**
*
* Check that the Peer certificate's issuer certificate matches the one found
* by issuer_nickname. This is not exactly the way OpenSSL and GNU TLS do the
* issuer check, so we provide comments that mimic the OpenSSL
* X509_check_issued function (in x509v3/v3_purp.c)
*/
static SECStatus check_issuer_cert(PRFileDesc *sock,
char *issuer_nickname)
{
CERTCertificate *cert,*cert_issuer,*issuer;
SECStatus res=SECSuccess;
void *proto_win = NULL;
/*
PRArenaPool *tmpArena = NULL;
CERTAuthKeyID *authorityKeyID = NULL;
SECITEM *caname = NULL;
*/
cert = SSL_PeerCertificate(sock);
cert_issuer = CERT_FindCertIssuer(cert,PR_Now(),certUsageObjectSigner);
proto_win = SSL_RevealPinArg(sock);
issuer = NULL;
issuer = PK11_FindCertFromNickname(issuer_nickname, proto_win);
if ((!cert_issuer) || (!issuer))
res = SECFailure;
else if (SECITEM_CompareItem(&cert_issuer->derCert,
&issuer->derCert)!=SECEqual)
res = SECFailure;
CERT_DestroyCertificate(cert);
CERT_DestroyCertificate(issuer);
CERT_DestroyCertificate(cert_issuer);
return res;
}
/**
*
* Callback to pick the SSL client certificate.
*/
static SECStatus SelectClientCert(void *arg, PRFileDesc *sock,
struct CERTDistNamesStr *caNames,
struct CERTCertificateStr **pRetCert,
struct SECKEYPrivateKeyStr **pRetKey)
{
static const char pem_nickname[] = "PEM Token #1";
const char *pem_slotname = pem_nickname;
struct ssl_connect_data *connssl = (struct ssl_connect_data *)arg;
struct SessionHandle *data = connssl->data;
const char *nickname = connssl->client_nickname;
if (mod && nickname &&
0 == strncmp(nickname, pem_nickname, /* length of "PEM Token" */ 9)) {
/* use the cert/key provided by PEM reader */
PK11SlotInfo *slot;
void *proto_win = SSL_RevealPinArg(sock);
*pRetKey = NULL;
*pRetCert = PK11_FindCertFromNickname(nickname, proto_win);
if (NULL == *pRetCert) {
failf(data, "NSS: client certificate not found: %s", nickname);
return SECFailure;
}
slot = PK11_FindSlotByName(pem_slotname);
if (NULL == slot) {
failf(data, "NSS: PK11 slot not found: %s", pem_slotname);
return SECFailure;
}
*pRetKey = PK11_FindPrivateKeyFromCert(slot, *pRetCert, NULL);
PK11_FreeSlot(slot);
if (NULL == *pRetKey) {
failf(data, "NSS: private key not found for certificate: %s", nickname);
return SECFailure;
}
infof(data, "NSS: client certificate: %s\n", nickname);
display_cert_info(data, *pRetCert);
return SECSuccess;
}
/* use the default NSS hook */
if (SECSuccess != NSS_GetClientAuthData((void *)nickname, sock, caNames,
pRetCert, pRetKey)
|| NULL == *pRetCert) {
if (NULL == nickname)
failf(data, "NSS: client certificate not found (nickname not specified)");
else
failf(data, "NSS: client certificate not found: %s", nickname);
return SECFailure;
}
/* get certificate nickname if any */
nickname = (*pRetCert)->nickname;
if (NULL == nickname)
nickname = "[unknown]";
if (NULL == *pRetKey) {
failf(data, "NSS: private key not found for certificate: %s", nickname);
return SECFailure;
}
infof(data, "NSS: using client certificate: %s\n", nickname);
display_cert_info(data, *pRetCert);
return SECSuccess;
}
/* This function is supposed to decide, which error codes should be used
* to conclude server is TLS intolerant.
*
* taken from xulrunner - nsNSSIOLayer.cpp
*/
static PRBool
isTLSIntoleranceError(PRInt32 err)
{
switch (err) {
case SSL_ERROR_BAD_MAC_ALERT:
case SSL_ERROR_BAD_MAC_READ:
case SSL_ERROR_HANDSHAKE_FAILURE_ALERT:
case SSL_ERROR_HANDSHAKE_UNEXPECTED_ALERT:
case SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE:
case SSL_ERROR_ILLEGAL_PARAMETER_ALERT:
case SSL_ERROR_NO_CYPHER_OVERLAP:
case SSL_ERROR_BAD_SERVER:
case SSL_ERROR_BAD_BLOCK_PADDING:
case SSL_ERROR_UNSUPPORTED_VERSION:
case SSL_ERROR_PROTOCOL_VERSION_ALERT:
case SSL_ERROR_RX_MALFORMED_FINISHED:
case SSL_ERROR_BAD_HANDSHAKE_HASH_VALUE:
case SSL_ERROR_DECODE_ERROR_ALERT:
case SSL_ERROR_RX_UNKNOWN_ALERT:
return PR_TRUE;
default:
return PR_FALSE;
}
}
/**
* Global SSL init
*
* @retval 0 error initializing SSL
* @retval 1 SSL initialized successfully
*/
int Curl_nss_init(void)
{
/* curl_global_init() is not thread-safe so this test is ok */
if (nss_initlock == NULL) {
PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 256);
nss_initlock = PR_NewLock();
}
/* We will actually initialize NSS later */
return 1;
}
/* Global cleanup */
void Curl_nss_cleanup(void)
{
/* This function isn't required to be threadsafe and this is only done
* as a safety feature.
*/
PR_Lock(nss_initlock);
if (initialized) {
/* Free references to client certificates held in the SSL session cache.
* Omitting this hampers destruction of the security module owning
* the certificates. */
SSL_ClearSessionCache();
if(mod && SECSuccess == SECMOD_UnloadUserModule(mod)) {
SECMOD_DestroyModule(mod);
mod = NULL;
}
NSS_Shutdown();
}
PR_Unlock(nss_initlock);
PR_DestroyLock(nss_initlock);
nss_initlock = NULL;
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);
/* NSS closes the socket we previously handed to it, so we must mark it
as closed to avoid double close */
fake_sclose(conn->sock[sockindex]);
conn->sock[sockindex] = CURL_SOCKET_BAD;
if(connssl->client_nickname != NULL) {
free(connssl->client_nickname);
connssl->client_nickname = NULL;
}
#ifdef HAVE_PK11_CREATEGENERICOBJECT
if(connssl->key)
(void)PK11_DestroyGenericObject(connssl->key);
if(connssl->cacert[1])
(void)PK11_DestroyGenericObject(connssl->cacert[1]);
if(connssl->cacert[0])
(void)PK11_DestroyGenericObject(connssl->cacert[0]);
#endif
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;
char *certDir = NULL;
int curlerr;
const int *cipher_to_enable;
PRSocketOptionData sock_opt;
PRUint32 timeout;
curlerr = CURLE_SSL_CONNECT_ERROR;
if (connssl->state == ssl_connection_complete)
return CURLE_OK;
connssl->data = data;
#ifdef HAVE_PK11_CREATEGENERICOBJECT
connssl->cacert[0] = NULL;
connssl->cacert[1] = NULL;
connssl->key = NULL;
#endif
/* FIXME. NSS doesn't support multiple databases open at the same time. */
PR_Lock(nss_initlock);
if(!initialized) {
struct_stat st;
/* First we check if $SSL_DIR points to a valid dir */
certDir = getenv("SSL_DIR");
if(certDir) {
if((stat(certDir, &st) != 0) ||
(!S_ISDIR(st.st_mode))) {
certDir = NULL;
}
}
/* Now we check if the default location is a valid dir */
if(!certDir) {
if((stat(SSL_DIR, &st) == 0) &&
(S_ISDIR(st.st_mode))) {
certDir = (char *)SSL_DIR;
}
}
if (!NSS_IsInitialized()) {
initialized = 1;
infof(conn->data, "Initializing NSS with certpath: %s\n",
certDir ? certDir : "none");
if(!certDir) {
rv = NSS_NoDB_Init(NULL);
}
else {
char *certpath = PR_smprintf("%s%s",
NSS_VersionCheck("3.12.0") ? "sql:" : "",
certDir);
rv = NSS_Initialize(certpath, "", "", "", NSS_INIT_READONLY);
PR_smprintf_free(certpath);
}
if(rv != SECSuccess) {
infof(conn->data, "Unable to initialize NSS database\n");
curlerr = CURLE_SSL_CACERT_BADFILE;
initialized = 0;
PR_Unlock(nss_initlock);
goto error;
}
}
if(num_enabled_ciphers() == 0)
NSS_SetDomesticPolicy();
#ifdef HAVE_PK11_CREATEGENERICOBJECT
if(!mod) {
char *configstring = aprintf("library=%s name=PEM", pem_library);
if(!configstring) {
PR_Unlock(nss_initlock);
goto error;
}
mod = SECMOD_LoadUserModule(configstring, NULL, PR_FALSE);
free(configstring);
if(!mod || !mod->loaded) {
if(mod) {
SECMOD_DestroyModule(mod);
mod = NULL;
}
infof(data, "WARNING: failed to load NSS PEM library %s. Using OpenSSL "
"PEM certificates will not work.\n", pem_library);
}
}
#endif
PK11_SetPasswordFunc(nss_get_password);
}
PR_Unlock(nss_initlock);
model = PR_NewTCPSocket();
if(!model)
goto error;
model = SSL_ImportFD(NULL, model);
/* make the socket nonblocking */
sock_opt.option = PR_SockOpt_Nonblocking;
sock_opt.value.non_blocking = PR_TRUE;
if(PR_SetSocketOption(model, &sock_opt) != SECSuccess)
goto error;
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:
ssl3 = PR_TRUE;
if (data->state.ssl_connect_retry)
infof(data, "TLS disabled due to previous handshake failure\n");
else
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(SSL_OptionSet(model, SSL_V2_COMPATIBLE_HELLO, ssl2) != SECSuccess)
goto error;
/* reset the flag to avoid an infinite loop */
data->state.ssl_connect_retry = FALSE;
/* enable all ciphers from enable_ciphers_by_default */
cipher_to_enable = enable_ciphers_by_default;
while (SSL_NULL_WITH_NULL_NULL != *cipher_to_enable) {
if (SSL_CipherPrefSet(model, *cipher_to_enable, PR_TRUE) != SECSuccess) {
curlerr = CURLE_SSL_CIPHER;
goto error;
}
cipher_to_enable++;
}
if(data->set.ssl.cipher_list) {
if(set_ciphers(data, model, data->set.ssl.cipher_list) != SECSuccess) {
curlerr = CURLE_SSL_CIPHER;
goto error;
}
}
if(data->set.ssl.verifyhost == 1)
infof(data, "warning: ignoring unsupported value (1) of ssl.verifyhost\n");
data->set.ssl.certverifyresult=0; /* not checked yet */
if(SSL_BadCertHook(model, (SSLBadCertHandler) BadCertHandler, conn)
!= SECSuccess) {
goto error;
}
if(SSL_HandshakeCallback(model, (SSLHandshakeCallback) HandshakeCallback,
NULL) != SECSuccess)
goto error;
if(!data->set.ssl.verifypeer)
/* skip the verifying of the peer */
;
else if(data->set.ssl.CAfile) {
int rc = nss_load_cert(&conn->ssl[sockindex], data->set.ssl.CAfile,
PR_TRUE);
if(!rc) {
curlerr = CURLE_SSL_CACERT_BADFILE;
goto error;
}
}
else if(data->set.ssl.CApath) {
struct_stat st;
PRDir *dir;
PRDirEntry *entry;
if(stat(data->set.ssl.CApath, &st) == -1) {
curlerr = CURLE_SSL_CACERT_BADFILE;
goto error;
}
if(S_ISDIR(st.st_mode)) {
int rc;
dir = PR_OpenDir(data->set.ssl.CApath);
do {
entry = PR_ReadDir(dir, PR_SKIP_BOTH | PR_SKIP_HIDDEN);
if(entry) {
char fullpath[PATH_MAX];
snprintf(fullpath, sizeof(fullpath), "%s/%s", data->set.ssl.CApath,
entry->name);
rc = nss_load_cert(&conn->ssl[sockindex], fullpath, PR_TRUE);
/* FIXME: check this return value! */
}
/* This is purposefully tolerant of errors so non-PEM files
* can be in the same directory */
} while(entry != NULL);
PR_CloseDir(dir);
}
}
infof(data,
" CAfile: %s\n"
" CApath: %s\n",
data->set.ssl.CAfile ? data->set.ssl.CAfile : "none",
data->set.ssl.CApath ? data->set.ssl.CApath : "none");
if (data->set.ssl.CRLfile) {
int rc = nss_load_crl(data->set.ssl.CRLfile, PR_FALSE);
if (!rc) {
curlerr = CURLE_SSL_CRL_BADFILE;
goto error;
}
infof(data,
" CRLfile: %s\n",
data->set.ssl.CRLfile ? data->set.ssl.CRLfile : "none");
}
if(data->set.str[STRING_CERT]) {
bool nickname_alloc = FALSE;
char *nickname = fmt_nickname(data->set.str[STRING_CERT], &nickname_alloc);
if(!nickname)
return CURLE_OUT_OF_MEMORY;
if(!cert_stuff(conn, sockindex, data->set.str[STRING_CERT],
data->set.str[STRING_KEY])) {
/* failf() is already done in cert_stuff() */
if(nickname_alloc)
free(nickname);
return CURLE_SSL_CERTPROBLEM;
}
/* this "takes over" the pointer to the allocated name or makes a
dup of it */
connssl->client_nickname = nickname_alloc?nickname:strdup(nickname);
if(!connssl->client_nickname)
return CURLE_OUT_OF_MEMORY;
}
else
connssl->client_nickname = NULL;
if(SSL_GetClientAuthDataHook(model, SelectClientCert,
(void *)connssl) != SECSuccess) {
curlerr = CURLE_SSL_CERTPROBLEM;
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;
PR_Close(model); /* We don't need this any more */
model = NULL;
/* This is the password associated with the cert that we're using */
if (data->set.str[STRING_KEY_PASSWD]) {
SSL_SetPKCS11PinArg(connssl->handle, data->set.str[STRING_KEY_PASSWD]);
}
/* Force handshake on next I/O */
SSL_ResetHandshake(connssl->handle, /* asServer */ PR_FALSE);
SSL_SetURL(connssl->handle, conn->host.name);
/* Force the handshake now */
timeout = PR_MillisecondsToInterval(Curl_timeleft(conn, NULL, TRUE));
if(SSL_ForceHandshakeWithTimeout(connssl->handle, timeout) != SECSuccess) {
if(conn->data->set.ssl.certverifyresult == SSL_ERROR_BAD_CERT_DOMAIN)
curlerr = CURLE_PEER_FAILED_VERIFICATION;
else if(conn->data->set.ssl.certverifyresult!=0)
curlerr = CURLE_SSL_CACERT;
goto error;
}
connssl->state = ssl_connection_complete;
display_conn_info(conn, connssl->handle);
if (data->set.str[STRING_SSL_ISSUERCERT]) {
SECStatus ret;
bool nickname_alloc = FALSE;
char *nickname = fmt_nickname(data->set.str[STRING_SSL_ISSUERCERT],
&nickname_alloc);
if(!nickname)
return CURLE_OUT_OF_MEMORY;
ret = check_issuer_cert(connssl->handle, nickname);
if(nickname_alloc)
free(nickname);
if(SECFailure == ret) {
infof(data,"SSL certificate issuer check failed\n");
curlerr = CURLE_SSL_ISSUER_ERROR;
goto error;
}
else {
infof(data, "SSL certificate issuer check ok\n");
}
}
return CURLE_OK;
error:
/* reset the flag to avoid an infinite loop */
data->state.ssl_connect_retry = FALSE;
err = PR_GetError();
infof(data, "NSS error %d\n", err);
if(model)
PR_Close(model);
if (ssl3 && tlsv1 && isTLSIntoleranceError(err)) {
/* schedule reconnect through Curl_retry_request() */
data->state.ssl_connect_retry = TRUE;
infof(data, "Error in TLS handshake, trying SSLv3...\n");
return CURLE_OK;
}
return curlerr;
}
/* return number of sent (non-SSL) bytes */
int Curl_nss_send(struct connectdata *conn, /* connection data */
int sockindex, /* socketindex */
const void *mem, /* send this data */
size_t len) /* amount to write */
{
int rc;
rc = PR_Send(conn->ssl[sockindex].handle, mem, (int)len, 0, -1);
if(rc < 0) {
failf(conn->data, "SSL write: error %d", PR_GetError());
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;
nread = PR_Recv(conn->ssl[num].handle, buf, (int)buffersize, 0, -1);
*wouldblock = FALSE;
if(nread < 0) {
/* failed SSL read */
PRInt32 err = PR_GetError();
if(err == PR_WOULD_BLOCK_ERROR) {
*wouldblock = TRUE;
return -1; /* basically EWOULDBLOCK */
}
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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