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curl/lib/vtls/nss.c
Daniel Stenberg 8dfd22089c vtls: make the random function mandatory in the TLS backend 
To force each backend implementation to really attempt to provide proper
random. If a proper random function is missing, then we can explicitly
make use of the default one we use when TLS support is missing.

This commit makes sure it works for darwinssl, gnutls, nss and openssl.
2014-07-30 00:05:47 +02:00

1944 lines
57 KiB
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2014, 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 vtls.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 "vtls.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"
#include "x509asn1.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;
struct curl_llist *nss_crl_list = NULL;
NSSInitContext * nss_context = NULL;
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. */
{"dhe_dss_aes_128_cbc_sha", TLS_DHE_DSS_WITH_AES_128_CBC_SHA},
{"dhe_dss_aes_256_cbc_sha", TLS_DHE_DSS_WITH_AES_256_CBC_SHA},
{"dhe_rsa_aes_128_cbc_sha", TLS_DHE_RSA_WITH_AES_128_CBC_SHA},
{"dhe_rsa_aes_256_cbc_sha", TLS_DHE_RSA_WITH_AES_256_CBC_SHA},
{"rsa_aes_128_sha", TLS_RSA_WITH_AES_128_CBC_SHA},
{"rsa_aes_256_sha", TLS_RSA_WITH_AES_256_CBC_SHA},
/* 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},
#ifdef TLS_RSA_WITH_NULL_SHA256
/* new HMAC-SHA256 cipher suites specified in RFC */
{"rsa_null_sha_256", TLS_RSA_WITH_NULL_SHA256},
{"rsa_aes_128_cbc_sha_256", TLS_RSA_WITH_AES_128_CBC_SHA256},
{"rsa_aes_256_cbc_sha_256", TLS_RSA_WITH_AES_256_CBC_SHA256},
{"dhe_rsa_aes_128_cbc_sha_256", TLS_DHE_RSA_WITH_AES_128_CBC_SHA256},
{"dhe_rsa_aes_256_cbc_sha_256", TLS_DHE_RSA_WITH_AES_256_CBC_SHA256},
{"ecdhe_ecdsa_aes_128_cbc_sha_256", TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256},
{"ecdhe_rsa_aes_128_cbc_sha_256", TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256},
#endif
#ifdef TLS_RSA_WITH_AES_128_GCM_SHA256
/* AES GCM cipher suites in RFC 5288 and RFC 5289 */
{"rsa_aes_128_gcm_sha_256", TLS_RSA_WITH_AES_128_GCM_SHA256},
{"dhe_rsa_aes_128_gcm_sha_256", TLS_DHE_RSA_WITH_AES_128_GCM_SHA256},
{"dhe_dss_aes_128_gcm_sha_256", TLS_DHE_DSS_WITH_AES_128_GCM_SHA256},
{"ecdhe_ecdsa_aes_128_gcm_sha_256", TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256},
{"ecdh_ecdsa_aes_128_gcm_sha_256", TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256},
{"ecdhe_rsa_aes_128_gcm_sha_256", TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256},
{"ecdh_rsa_aes_128_gcm_sha_256", TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256},
#endif
};
static const char* pem_library = "libnsspem.so";
SECMODModule* mod = NULL;
/* NSPR I/O layer we use to detect blocking direction during SSL handshake */
static PRDescIdentity nspr_io_identity = PR_INVALID_IO_LAYER;
static PRIOMethods nspr_io_methods;
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;
/* 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], PR_FALSE);
}
/* 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++) {
if(!cipher_state[i])
continue;
if(SSL_CipherPrefSet(model, cipherlist[i].num, PR_TRUE) != SECSuccess) {
failf(data, "cipher-suite not supported by NSS: %s", cipherlist[i].name);
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;
}
/* Check if the given string is filename or nickname of a certificate. If the
* given string is recognized as filename, return NULL. If the given string is
* recognized as nickname, return a duplicated string. The returned string
* should be later deallocated using free(). If the OOM failure occurs, we
* return NULL, too.
*/
static char* dup_nickname(struct SessionHandle *data, enum dupstring cert_kind)
{
const char *str = data->set.str[cert_kind];
const char *n;
if(!is_file(str))
/* no such file exists, use the string as nickname */
return strdup(str);
/* search the last slash; we require at least one slash in a file name */
n = strrchr(str, '/');
if(!n) {
infof(data, "warning: certificate file name \"%s\" handled as nickname; "
"please use \"./%s\" to force file name\n", str, str);
return strdup(str);
}
/* we'll use the PEM reader to read the certificate from file */
return NULL;
}
/* Call PK11_CreateGenericObject() with the given obj_class and filename. If
* the call succeeds, append the object handle to the list of objects so that
* the object can be destroyed in Curl_nss_close(). */
static CURLcode nss_create_object(struct ssl_connect_data *ssl,
CK_OBJECT_CLASS obj_class,
const char *filename, bool cacert)
{
PK11SlotInfo *slot;
PK11GenericObject *obj;
CK_BBOOL cktrue = CK_TRUE;
CK_BBOOL ckfalse = CK_FALSE;
CK_ATTRIBUTE attrs[/* max count of attributes */ 4];
int attr_cnt = 0;
CURLcode err = (cacert)
? CURLE_SSL_CACERT_BADFILE
: CURLE_SSL_CERTPROBLEM;
const int slot_id = (cacert) ? 0 : 1;
char *slot_name = aprintf("PEM Token #%d", slot_id);
if(!slot_name)
return CURLE_OUT_OF_MEMORY;
slot = PK11_FindSlotByName(slot_name);
free(slot_name);
if(!slot)
return err;
PK11_SETATTRS(attrs, attr_cnt, CKA_CLASS, &obj_class, sizeof(obj_class));
PK11_SETATTRS(attrs, attr_cnt, CKA_TOKEN, &cktrue, sizeof(CK_BBOOL));
PK11_SETATTRS(attrs, attr_cnt, CKA_LABEL, (unsigned char *)filename,
strlen(filename) + 1);
if(CKO_CERTIFICATE == obj_class) {
CK_BBOOL *pval = (cacert) ? (&cktrue) : (&ckfalse);
PK11_SETATTRS(attrs, attr_cnt, CKA_TRUST, pval, sizeof(*pval));
}
obj = PK11_CreateGenericObject(slot, attrs, attr_cnt, PR_FALSE);
PK11_FreeSlot(slot);
if(!obj)
return err;
if(!Curl_llist_insert_next(ssl->obj_list, ssl->obj_list->tail, obj)) {
PK11_DestroyGenericObject(obj);
return CURLE_OUT_OF_MEMORY;
}
if(!cacert && CKO_CERTIFICATE == obj_class)
/* store reference to a client certificate */
ssl->obj_clicert = obj;
return CURLE_OK;
}
/* Destroy the NSS object whose handle is given by ptr. This function is
* a callback of Curl_llist_alloc() used by Curl_llist_destroy() to destroy
* NSS objects in Curl_nss_close() */
static void nss_destroy_object(void *user, void *ptr)
{
PK11GenericObject *obj = (PK11GenericObject *)ptr;
(void) user;
PK11_DestroyGenericObject(obj);
}
/* same as nss_destroy_object() but for CRL items */
static void nss_destroy_crl_item(void *user, void *ptr)
{
SECItem *crl_der = (SECItem *)ptr;
(void) user;
SECITEM_FreeItem(crl_der, PR_TRUE);
}
static CURLcode nss_load_cert(struct ssl_connect_data *ssl,
const char *filename, PRBool cacert)
{
CURLcode err = (cacert)
? CURLE_SSL_CACERT_BADFILE
: CURLE_SSL_CERTPROBLEM;
/* libnsspem.so leaks memory if the requested file does not exist. For more
* details, go to <https://bugzilla.redhat.com/734760>. */
if(is_file(filename))
err = nss_create_object(ssl, CKO_CERTIFICATE, filename, cacert);
if(CURLE_OK == err && !cacert) {
/* we have successfully loaded a client certificate */
CERTCertificate *cert;
char *nickname = NULL;
char *n = strrchr(filename, '/');
if(n)
n++;
/* The following undocumented magic helps to avoid a SIGSEGV on call
* of PK11_ReadRawAttribute() from SelectClientCert() when using an
* immature version of libnsspem.so. For more details, go to
* <https://bugzilla.redhat.com/733685>. */
nickname = aprintf("PEM Token #1:%s", n);
if(nickname) {
cert = PK11_FindCertFromNickname(nickname, NULL);
if(cert)
CERT_DestroyCertificate(cert);
free(nickname);
}
}
return err;
}
/* add given CRL to cache if it is not already there */
static CURLcode nss_cache_crl(SECItem *crl_der)
{
CERTCertDBHandle *db = CERT_GetDefaultCertDB();
CERTSignedCrl *crl = SEC_FindCrlByDERCert(db, crl_der, 0);
if(crl) {
/* CRL already cached */
SEC_DestroyCrl(crl);
SECITEM_FreeItem(crl_der, PR_TRUE);
return CURLE_SSL_CRL_BADFILE;
}
/* acquire lock before call of CERT_CacheCRL() and accessing nss_crl_list */
PR_Lock(nss_crllock);
/* store the CRL item so that we can free it in Curl_nss_cleanup() */
if(!Curl_llist_insert_next(nss_crl_list, nss_crl_list->tail, crl_der)) {
SECITEM_FreeItem(crl_der, PR_TRUE);
PR_Unlock(nss_crllock);
return CURLE_OUT_OF_MEMORY;
}
if(SECSuccess != CERT_CacheCRL(db, crl_der)) {
/* unable to cache CRL */
PR_Unlock(nss_crllock);
return CURLE_SSL_CRL_BADFILE;
}
/* we need to clear session cache, so that the CRL could take effect */
SSL_ClearSessionCache();
PR_Unlock(nss_crllock);
return CURLE_OK;
}
static CURLcode nss_load_crl(const char* crlfilename)
{
PRFileDesc *infile;
PRFileInfo info;
SECItem filedata = { 0, NULL, 0 };
SECItem *crl_der = NULL;
char *body;
infile = PR_Open(crlfilename, PR_RDONLY, 0);
if(!infile)
return CURLE_SSL_CRL_BADFILE;
if(PR_SUCCESS != PR_GetOpenFileInfo(infile, &info))
goto fail;
if(!SECITEM_AllocItem(NULL, &filedata, info.size + /* zero ended */ 1))
goto fail;
if(info.size != PR_Read(infile, filedata.data, info.size))
goto fail;
crl_der = SECITEM_AllocItem(NULL, NULL, 0U);
if(!crl_der)
goto fail;
/* place a trailing zero right after the visible data */
body = (char*)filedata.data;
body[--filedata.len] = '\0';
body = strstr(body, "-----BEGIN");
if(body) {
/* assume ASCII */
char *trailer;
char *begin = PORT_Strchr(body, '\n');
if(!begin)
begin = PORT_Strchr(body, '\r');
if(!begin)
goto fail;
trailer = strstr(++begin, "-----END");
if(!trailer)
goto fail;
/* retrieve DER from ASCII */
*trailer = '\0';
if(ATOB_ConvertAsciiToItem(crl_der, begin))
goto fail;
SECITEM_FreeItem(&filedata, PR_FALSE);
}
else
/* assume DER */
*crl_der = filedata;
PR_Close(infile);
return nss_cache_crl(crl_der);
fail:
PR_Close(infile);
SECITEM_FreeItem(crl_der, PR_TRUE);
SECITEM_FreeItem(&filedata, PR_FALSE);
return CURLE_SSL_CRL_BADFILE;
}
static CURLcode nss_load_key(struct connectdata *conn, int sockindex,
char *key_file)
{
PK11SlotInfo *slot;
SECStatus status;
CURLcode rv;
struct ssl_connect_data *ssl = conn->ssl;
(void)sockindex; /* unused */
rv = nss_create_object(ssl, CKO_PRIVATE_KEY, key_file, FALSE);
if(CURLE_OK != rv) {
PR_SetError(SEC_ERROR_BAD_KEY, 0);
return rv;
}
slot = PK11_FindSlotByName("PEM Token #1");
if(!slot)
return CURLE_SSL_CERTPROBLEM;
/* This will force the token to be seen as re-inserted */
SECMOD_WaitForAnyTokenEvent(mod, 0, 0);
PK11_IsPresent(slot);
status = PK11_Authenticate(slot, PR_TRUE,
conn->data->set.str[STRING_KEY_PASSWD]);
PK11_FreeSlot(slot);
return (SECSuccess == status)
? CURLE_OK
: CURLE_SSL_CERTPROBLEM;
}
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 CURLcode cert_stuff(struct connectdata *conn, int sockindex,
char *cert_file, char *key_file)
{
struct SessionHandle *data = conn->data;
CURLcode rv;
if(cert_file) {
rv = nss_load_cert(&conn->ssl[sockindex], cert_file, PR_FALSE);
if(CURLE_OK != rv) {
const PRErrorCode err = PR_GetError();
if(!display_error(conn, err, cert_file)) {
const char *err_name = nss_error_to_name(err);
failf(data, "unable to load client cert: %d (%s)", err, err_name);
}
return rv;
}
}
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(CURLE_OK != rv) {
const PRErrorCode err = PR_GetError();
if(!display_error(conn, err, key_file)) {
const char *err_name = nss_error_to_name(err);
failf(data, "unable to load client key: %d (%s)", err, err_name);
}
return rv;
}
}
return CURLE_OK;
}
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);
}
/* bypass the default SSL_AuthCertificate() hook in case we do not want to
* verify peer */
static SECStatus nss_auth_cert_hook(void *arg, PRFileDesc *fd, PRBool checksig,
PRBool isServer)
{
struct connectdata *conn = (struct connectdata *)arg;
if(!conn->data->set.ssl.verifypeer) {
infof(conn->data, "skipping SSL peer certificate verification\n");
return SECSuccess;
}
return SSL_AuthCertificate(CERT_GetDefaultCertDB(), fd, checksig, isServer);
}
/**
* Inform the application that the handshake is complete.
*/
static void HandshakeCallback(PRFileDesc *sock, void *arg)
{
#ifdef USE_NGHTTP2
struct connectdata *conn = (struct connectdata*) arg;
unsigned int buflenmax = 50;
unsigned char buf[50];
unsigned int buflen;
SSLNextProtoState state;
if(!conn->data->set.ssl_enable_npn && !conn->data->set.ssl_enable_alpn) {
return;
}
if(SSL_GetNextProto(sock, &state, buf, &buflen, buflenmax) == SECSuccess) {
switch(state) {
case SSL_NEXT_PROTO_NO_SUPPORT:
case SSL_NEXT_PROTO_NO_OVERLAP:
infof(conn->data, "TLS, neither ALPN nor NPN succeeded\n");
return;
#ifdef SSL_ENABLE_ALPN
case SSL_NEXT_PROTO_SELECTED:
infof(conn->data, "ALPN, server accepted to use %.*s\n", buflen, buf);
break;
#endif
case SSL_NEXT_PROTO_NEGOTIATED:
infof(conn->data, "NPN, server accepted to use %.*s\n", buflen, buf);
break;
}
if(buflen == NGHTTP2_PROTO_VERSION_ID_LEN &&
memcmp(NGHTTP2_PROTO_VERSION_ID, buf, NGHTTP2_PROTO_VERSION_ID_LEN)
== 0) {
conn->negnpn = NPN_HTTP2;
}
else if(buflen == ALPN_HTTP_1_1_LENGTH && memcmp(ALPN_HTTP_1_1, buf,
ALPN_HTTP_1_1_LENGTH)) {
conn->negnpn = NPN_HTTP1_1;
}
}
#else
(void)sock;
(void)arg;
#endif
}
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;
CERTCertificate *cert2;
CERTCertificate *cert3;
PRTime now;
int i;
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);
}
}
cert = SSL_PeerCertificate(sock);
if(cert) {
infof(conn->data, "Server certificate:\n");
if(!conn->data->set.ssl.certinfo) {
display_cert_info(conn->data, cert);
CERT_DestroyCertificate(cert);
}
else {
/* Count certificates in chain. */
now = PR_Now();
i = 1;
if(!cert->isRoot) {
cert2 = CERT_FindCertIssuer(cert, now, certUsageSSLCA);
while(cert2) {
i++;
if(cert2->isRoot) {
CERT_DestroyCertificate(cert2);
break;
}
cert3 = CERT_FindCertIssuer(cert2, now, certUsageSSLCA);
CERT_DestroyCertificate(cert2);
cert2 = cert3;
}
}
Curl_ssl_init_certinfo(conn->data, i);
for(i = 0; cert; cert = cert2) {
Curl_extract_certinfo(conn, i++, (char *)cert->derCert.data,
(char *)cert->derCert.data + cert->derCert.len);
if(cert->isRoot) {
CERT_DestroyCertificate(cert);
break;
}
cert2 = CERT_FindCertIssuer(cert, now, certUsageSSLCA);
CERT_DestroyCertificate(cert);
}
}
}
return;
}
static SECStatus BadCertHandler(void *arg, PRFileDesc *sock)
{
struct connectdata *conn = (struct connectdata *)arg;
struct SessionHandle *data = conn->data;
PRErrorCode err = PR_GetError();
CERTCertificate *cert;
/* remember the cert verification result */
data->set.ssl.certverifyresult = err;
if(err == SSL_ERROR_BAD_CERT_DOMAIN && !data->set.ssl.verifyhost)
/* we are asked not to verify the host name */
return SECSuccess;
/* print only info about the cert, the error is printed off the callback */
cert = SSL_PeerCertificate(sock);
if(cert) {
infof(data, "Server certificate:\n");
display_cert_info(data, cert);
CERT_DestroyCertificate(cert);
}
return SECFailure;
}
/**
*
* 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 = 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)
{
struct ssl_connect_data *connssl = (struct ssl_connect_data *)arg;
struct SessionHandle *data = connssl->data;
const char *nickname = connssl->client_nickname;
if(connssl->obj_clicert) {
/* use the cert/key provided by PEM reader */
static const char pem_slotname[] = "PEM Token #1";
SECItem cert_der = { 0, NULL, 0 };
void *proto_win = SSL_RevealPinArg(sock);
struct CERTCertificateStr *cert;
struct SECKEYPrivateKeyStr *key;
PK11SlotInfo *slot = PK11_FindSlotByName(pem_slotname);
if(NULL == slot) {
failf(data, "NSS: PK11 slot not found: %s", pem_slotname);
return SECFailure;
}
if(PK11_ReadRawAttribute(PK11_TypeGeneric, connssl->obj_clicert, CKA_VALUE,
&cert_der) != SECSuccess) {
failf(data, "NSS: CKA_VALUE not found in PK11 generic object");
PK11_FreeSlot(slot);
return SECFailure;
}
cert = PK11_FindCertFromDERCertItem(slot, &cert_der, proto_win);
SECITEM_FreeItem(&cert_der, PR_FALSE);
if(NULL == cert) {
failf(data, "NSS: client certificate from file not found");
PK11_FreeSlot(slot);
return SECFailure;
}
key = PK11_FindPrivateKeyFromCert(slot, cert, NULL);
PK11_FreeSlot(slot);
if(NULL == key) {
failf(data, "NSS: private key from file not found");
CERT_DestroyCertificate(cert);
return SECFailure;
}
infof(data, "NSS: client certificate from file\n");
display_cert_info(data, cert);
*pRetCert = cert;
*pRetKey = key;
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;
}
}
/* update blocking direction in case of PR_WOULD_BLOCK_ERROR */
static void nss_update_connecting_state(ssl_connect_state state, void *secret)
{
struct ssl_connect_data *connssl = (struct ssl_connect_data *)secret;
if(PR_GetError() != PR_WOULD_BLOCK_ERROR)
/* an unrelated error is passing by */
return;
switch(connssl->connecting_state) {
case ssl_connect_2:
case ssl_connect_2_reading:
case ssl_connect_2_writing:
break;
default:
/* we are not called from an SSL handshake */
return;
}
/* update the state accordingly */
connssl->connecting_state = state;
}
/* recv() wrapper we use to detect blocking direction during SSL handshake */
static PRInt32 nspr_io_recv(PRFileDesc *fd, void *buf, PRInt32 amount,
PRIntn flags, PRIntervalTime timeout)
{
const PRRecvFN recv_fn = fd->lower->methods->recv;
const PRInt32 rv = recv_fn(fd->lower, buf, amount, flags, timeout);
if(rv < 0)
/* check for PR_WOULD_BLOCK_ERROR and update blocking direction */
nss_update_connecting_state(ssl_connect_2_reading, fd->secret);
return rv;
}
/* send() wrapper we use to detect blocking direction during SSL handshake */
static PRInt32 nspr_io_send(PRFileDesc *fd, const void *buf, PRInt32 amount,
PRIntn flags, PRIntervalTime timeout)
{
const PRSendFN send_fn = fd->lower->methods->send;
const PRInt32 rv = send_fn(fd->lower, buf, amount, flags, timeout);
if(rv < 0)
/* check for PR_WOULD_BLOCK_ERROR and update blocking direction */
nss_update_connecting_state(ssl_connect_2_writing, fd->secret);
return rv;
}
/* close() wrapper to avoid assertion failure due to fd->secret != NULL */
static PRStatus nspr_io_close(PRFileDesc *fd)
{
const PRCloseFN close_fn = PR_GetDefaultIOMethods()->close;
fd->secret = NULL;
return close_fn(fd);
}
static CURLcode nss_init_core(struct SessionHandle *data, const char *cert_dir)
{
NSSInitParameters initparams;
if(nss_context != NULL)
return CURLE_OK;
memset((void *) &initparams, '\0', sizeof(initparams));
initparams.length = sizeof(initparams);
if(cert_dir) {
char *certpath = aprintf("sql:%s", cert_dir);
if(!certpath)
return CURLE_OUT_OF_MEMORY;
infof(data, "Initializing NSS with certpath: %s\n", certpath);
nss_context = NSS_InitContext(certpath, "", "", "", &initparams,
NSS_INIT_READONLY | NSS_INIT_PK11RELOAD);
free(certpath);
if(nss_context != NULL)
return CURLE_OK;
infof(data, "Unable to initialize NSS database\n");
}
infof(data, "Initializing NSS with certpath: none\n");
nss_context = NSS_InitContext("", "", "", "", &initparams, NSS_INIT_READONLY
| NSS_INIT_NOCERTDB | NSS_INIT_NOMODDB | NSS_INIT_FORCEOPEN
| NSS_INIT_NOROOTINIT | NSS_INIT_OPTIMIZESPACE | NSS_INIT_PK11RELOAD);
if(nss_context != NULL)
return CURLE_OK;
infof(data, "Unable to initialize NSS\n");
return CURLE_SSL_CACERT_BADFILE;
}
static CURLcode nss_init(struct SessionHandle *data)
{
char *cert_dir;
struct_stat st;
CURLcode rv;
if(initialized)
return CURLE_OK;
/* list of all CRL items we need to destroy in Curl_nss_cleanup() */
nss_crl_list = Curl_llist_alloc(nss_destroy_crl_item);
if(!nss_crl_list)
return CURLE_OUT_OF_MEMORY;
/* First we check if $SSL_DIR points to a valid dir */
cert_dir = getenv("SSL_DIR");
if(cert_dir) {
if((stat(cert_dir, &st) != 0) ||
(!S_ISDIR(st.st_mode))) {
cert_dir = NULL;
}
}
/* Now we check if the default location is a valid dir */
if(!cert_dir) {
if((stat(SSL_DIR, &st) == 0) &&
(S_ISDIR(st.st_mode))) {
cert_dir = (char *)SSL_DIR;
}
}
if(nspr_io_identity == PR_INVALID_IO_LAYER) {
/* allocate an identity for our own NSPR I/O layer */
nspr_io_identity = PR_GetUniqueIdentity("libcurl");
if(nspr_io_identity == PR_INVALID_IO_LAYER)
return CURLE_OUT_OF_MEMORY;
/* the default methods just call down to the lower I/O layer */
memcpy(&nspr_io_methods, PR_GetDefaultIOMethods(), sizeof nspr_io_methods);
/* override certain methods in the table by our wrappers */
nspr_io_methods.recv = nspr_io_recv;
nspr_io_methods.send = nspr_io_send;
nspr_io_methods.close = nspr_io_close;
}
rv = nss_init_core(data, cert_dir);
if(rv)
return rv;
if(num_enabled_ciphers() == 0)
NSS_SetDomesticPolicy();
initialized = 1;
return CURLE_OK;
}
/**
* 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();
nss_crllock = PR_NewLock();
}
/* We will actually initialize NSS later */
return 1;
}
CURLcode Curl_nss_force_init(struct SessionHandle *data)
{
CURLcode rv;
if(!nss_initlock) {
failf(data,
"unable to initialize NSS, curl_global_init() should have been "
"called with CURL_GLOBAL_SSL or CURL_GLOBAL_ALL");
return CURLE_FAILED_INIT;
}
PR_Lock(nss_initlock);
rv = nss_init(data);
PR_Unlock(nss_initlock);
return rv;
}
/* 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_ShutdownContext(nss_context);
nss_context = NULL;
}
/* destroy all CRL items */
Curl_llist_destroy(nss_crl_list, NULL);
nss_crl_list = NULL;
PR_Unlock(nss_initlock);
PR_DestroyLock(nss_initlock);
PR_DestroyLock(nss_crllock);
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) {
/* 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) || (connssl->obj_clicert != NULL))
/* A server might require different authentication based on the
* particular path being requested by the client. To support this
* scenario, we must ensure that a connection will never reuse the
* authentication data from a previous connection. */
SSL_InvalidateSession(connssl->handle);
if(connssl->client_nickname != NULL) {
free(connssl->client_nickname);
connssl->client_nickname = NULL;
}
/* destroy all NSS objects in order to avoid failure of NSS shutdown */
Curl_llist_destroy(connssl->obj_list, NULL);
connssl->obj_list = NULL;
connssl->obj_clicert = NULL;
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;
}
/* return true if NSS can provide error code (and possibly msg) for the
error */
static bool is_nss_error(CURLcode err)
{
switch(err) {
case CURLE_PEER_FAILED_VERIFICATION:
case CURLE_SSL_CACERT:
case CURLE_SSL_CERTPROBLEM:
case CURLE_SSL_CONNECT_ERROR:
case CURLE_SSL_ISSUER_ERROR:
return true;
default:
return false;
}
}
/* return true if the given error code is related to a client certificate */
static bool is_cc_error(PRInt32 err)
{
switch(err) {
case SSL_ERROR_BAD_CERT_ALERT:
case SSL_ERROR_EXPIRED_CERT_ALERT:
case SSL_ERROR_REVOKED_CERT_ALERT:
return true;
default:
return false;
}
}
static Curl_recv nss_recv;
static Curl_send nss_send;
static CURLcode nss_load_ca_certificates(struct connectdata *conn,
int sockindex)
{
struct SessionHandle *data = conn->data;
const char *cafile = data->set.ssl.CAfile;
const char *capath = data->set.ssl.CApath;
if(cafile) {
CURLcode rv = nss_load_cert(&conn->ssl[sockindex], cafile, PR_TRUE);
if(CURLE_OK != rv)
return rv;
}
if(capath) {
struct_stat st;
if(stat(capath, &st) == -1)
return CURLE_SSL_CACERT_BADFILE;
if(S_ISDIR(st.st_mode)) {
PRDirEntry *entry;
PRDir *dir = PR_OpenDir(capath);
if(!dir)
return CURLE_SSL_CACERT_BADFILE;
while((entry = PR_ReadDir(dir, PR_SKIP_BOTH | PR_SKIP_HIDDEN))) {
char *fullpath = aprintf("%s/%s", capath, entry->name);
if(!fullpath) {
PR_CloseDir(dir);
return CURLE_OUT_OF_MEMORY;
}
if(CURLE_OK != nss_load_cert(&conn->ssl[sockindex], fullpath, PR_TRUE))
/* This is purposefully tolerant of errors so non-PEM files can
* be in the same directory */
infof(data, "failed to load '%s' from CURLOPT_CAPATH\n", fullpath);
free(fullpath);
}
PR_CloseDir(dir);
}
else
infof(data, "warning: CURLOPT_CAPATH not a directory (%s)\n", capath);
}
infof(data, " CAfile: %s\n CApath: %s\n",
cafile ? cafile : "none",
capath ? capath : "none");
return CURLE_OK;
}
static CURLcode nss_init_sslver(SSLVersionRange *sslver,
struct SessionHandle *data)
{
switch (data->set.ssl.version) {
default:
case CURL_SSLVERSION_DEFAULT:
sslver->min = SSL_LIBRARY_VERSION_3_0;
if(data->state.ssl_connect_retry) {
infof(data, "TLS disabled due to previous handshake failure\n");
sslver->max = SSL_LIBRARY_VERSION_3_0;
return CURLE_OK;
}
/* intentional fall-through to default to highest TLS version if possible */
case CURL_SSLVERSION_TLSv1:
#ifdef SSL_LIBRARY_VERSION_TLS_1_2
sslver->max = SSL_LIBRARY_VERSION_TLS_1_2;
#elif defined SSL_LIBRARY_VERSION_TLS_1_1
sslver->max = SSL_LIBRARY_VERSION_TLS_1_1;
#else
sslver->max = SSL_LIBRARY_VERSION_TLS_1_0;
#endif
return CURLE_OK;
case CURL_SSLVERSION_SSLv2:
sslver->min = SSL_LIBRARY_VERSION_2;
sslver->max = SSL_LIBRARY_VERSION_2;
return CURLE_OK;
case CURL_SSLVERSION_SSLv3:
sslver->min = SSL_LIBRARY_VERSION_3_0;
sslver->max = SSL_LIBRARY_VERSION_3_0;
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_0:
sslver->min = SSL_LIBRARY_VERSION_TLS_1_0;
sslver->max = SSL_LIBRARY_VERSION_TLS_1_0;
return CURLE_OK;
case CURL_SSLVERSION_TLSv1_1:
#ifdef SSL_LIBRARY_VERSION_TLS_1_1
sslver->min = SSL_LIBRARY_VERSION_TLS_1_1;
sslver->max = SSL_LIBRARY_VERSION_TLS_1_1;
return CURLE_OK;
#endif
break;
case CURL_SSLVERSION_TLSv1_2:
#ifdef SSL_LIBRARY_VERSION_TLS_1_2
sslver->min = SSL_LIBRARY_VERSION_TLS_1_2;
sslver->max = SSL_LIBRARY_VERSION_TLS_1_2;
return CURLE_OK;
#endif
break;
}
failf(data, "TLS minor version cannot be set");
return CURLE_SSL_CONNECT_ERROR;
}
static CURLcode nss_fail_connect(struct ssl_connect_data *connssl,
struct SessionHandle *data,
CURLcode curlerr)
{
SSLVersionRange sslver;
PRErrorCode err = 0;
/* reset the flag to avoid an infinite loop */
data->state.ssl_connect_retry = FALSE;
if(is_nss_error(curlerr)) {
/* read NSPR error code */
err = PR_GetError();
if(is_cc_error(err))
curlerr = CURLE_SSL_CERTPROBLEM;
/* print the error number and error string */
infof(data, "NSS error %d (%s)\n", err, nss_error_to_name(err));
/* print a human-readable message describing the error if available */
nss_print_error_message(data, err);
}
/* cleanup on connection failure */
Curl_llist_destroy(connssl->obj_list, NULL);
connssl->obj_list = NULL;
if(connssl->handle
&& (SSL_VersionRangeGet(connssl->handle, &sslver) == SECSuccess)
&& (sslver.min == SSL_LIBRARY_VERSION_3_0)
&& (sslver.max != SSL_LIBRARY_VERSION_3_0)
&& 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;
}
/* Switch the SSL socket into non-blocking mode. */
static CURLcode nss_set_nonblock(struct ssl_connect_data *connssl,
struct SessionHandle *data)
{
static PRSocketOptionData sock_opt;
sock_opt.option = PR_SockOpt_Nonblocking;
sock_opt.value.non_blocking = PR_TRUE;
if(PR_SetSocketOption(connssl->handle, &sock_opt) != PR_SUCCESS)
return nss_fail_connect(connssl, data, CURLE_SSL_CONNECT_ERROR);
return CURLE_OK;
}
static CURLcode nss_setup_connect(struct connectdata *conn, int sockindex)
{
PRFileDesc *model = NULL;
PRFileDesc *nspr_io = NULL;
PRFileDesc *nspr_io_stub = NULL;
PRBool ssl_no_cache;
PRBool ssl_cbc_random_iv;
struct SessionHandle *data = conn->data;
curl_socket_t sockfd = conn->sock[sockindex];
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
CURLcode curlerr;
SSLVersionRange sslver = {
SSL_LIBRARY_VERSION_TLS_1_0, /* min */
SSL_LIBRARY_VERSION_TLS_1_0 /* max */
};
#ifdef USE_NGHTTP2
#if defined(SSL_ENABLE_NPN) || defined(SSL_ENABLE_ALPN)
unsigned int alpn_protos_len = NGHTTP2_PROTO_VERSION_ID_LEN +
ALPN_HTTP_1_1_LENGTH + 2;
unsigned char alpn_protos[NGHTTP2_PROTO_VERSION_ID_LEN + ALPN_HTTP_1_1_LENGTH
+ 2];
int cur = 0;
#endif
#endif
if(connssl->state == ssl_connection_complete)
return CURLE_OK;
connssl->data = data;
/* list of all NSS objects we need to destroy in Curl_nss_close() */
connssl->obj_list = Curl_llist_alloc(nss_destroy_object);
if(!connssl->obj_list)
return CURLE_OUT_OF_MEMORY;
/* FIXME. NSS doesn't support multiple databases open at the same time. */
PR_Lock(nss_initlock);
curlerr = nss_init(conn->data);
if(CURLE_OK != curlerr) {
PR_Unlock(nss_initlock);
goto error;
}
curlerr = CURLE_SSL_CONNECT_ERROR;
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);
}
}
PK11_SetPasswordFunc(nss_get_password);
PR_Unlock(nss_initlock);
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;
/* do not use SSL cache if disabled or we are not going to verify peer */
ssl_no_cache = (conn->ssl_config.sessionid && data->set.ssl.verifypeer) ?
PR_FALSE : PR_TRUE;
if(SSL_OptionSet(model, SSL_NO_CACHE, ssl_no_cache) != SECSuccess)
goto error;
/* enable/disable the requested SSL version(s) */
if(nss_init_sslver(&sslver, data) != CURLE_OK)
goto error;
if(SSL_VersionRangeSet(model, &sslver) != SECSuccess)
goto error;
ssl_cbc_random_iv = !data->set.ssl_enable_beast;
#ifdef SSL_CBC_RANDOM_IV
/* unless the user explicitly asks to allow the protocol vulnerability, we
use the work-around */
if(SSL_OptionSet(model, SSL_CBC_RANDOM_IV, ssl_cbc_random_iv) != SECSuccess)
infof(data, "warning: failed to set SSL_CBC_RANDOM_IV = %d\n",
ssl_cbc_random_iv);
#else
if(ssl_cbc_random_iv)
infof(data, "warning: support for SSL_CBC_RANDOM_IV not compiled in\n");
#endif
/* reset the flag to avoid an infinite loop */
data->state.ssl_connect_retry = FALSE;
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.verifypeer && data->set.ssl.verifyhost)
infof(data, "warning: ignoring value of ssl.verifyhost\n");
/* bypass the default SSL_AuthCertificate() hook in case we do not want to
* verify peer */
if(SSL_AuthCertificateHook(model, nss_auth_cert_hook, conn) != SECSuccess)
goto error;
data->set.ssl.certverifyresult=0; /* not checked yet */
if(SSL_BadCertHook(model, BadCertHandler, conn) != SECSuccess)
goto error;
if(SSL_HandshakeCallback(model, HandshakeCallback, conn) != SECSuccess)
goto error;
if(data->set.ssl.verifypeer) {
const CURLcode rv = nss_load_ca_certificates(conn, sockindex);
if(CURLE_OK != rv) {
curlerr = rv;
goto error;
}
}
if(data->set.ssl.CRLfile) {
const CURLcode rv = nss_load_crl(data->set.ssl.CRLfile);
if(CURLE_OK != rv) {
curlerr = rv;
goto error;
}
infof(data, " CRLfile: %s\n", data->set.ssl.CRLfile);
}
if(data->set.str[STRING_CERT]) {
char *nickname = dup_nickname(data, STRING_CERT);
if(nickname) {
/* we are not going to use libnsspem.so to read the client cert */
connssl->obj_clicert = NULL;
}
else {
CURLcode rv = cert_stuff(conn, sockindex, data->set.str[STRING_CERT],
data->set.str[STRING_KEY]);
if(CURLE_OK != rv) {
/* failf() is already done in cert_stuff() */
curlerr = rv;
goto error;
}
}
/* store the nickname for SelectClientCert() called during handshake */
connssl->client_nickname = nickname;
}
else
connssl->client_nickname = NULL;
if(SSL_GetClientAuthDataHook(model, SelectClientCert,
(void *)connssl) != SECSuccess) {
curlerr = CURLE_SSL_CERTPROBLEM;
goto error;
}
/* wrap OS file descriptor by NSPR's file descriptor abstraction */
nspr_io = PR_ImportTCPSocket(sockfd);
if(!nspr_io)
goto error;
/* create our own NSPR I/O layer */
nspr_io_stub = PR_CreateIOLayerStub(nspr_io_identity, &nspr_io_methods);
if(!nspr_io_stub) {
PR_Close(nspr_io);
goto error;
}
/* make the per-connection data accessible from NSPR I/O callbacks */
nspr_io_stub->secret = (void *)connssl;
/* push our new layer to the NSPR I/O stack */
if(PR_PushIOLayer(nspr_io, PR_TOP_IO_LAYER, nspr_io_stub) != PR_SUCCESS) {
PR_Close(nspr_io);
PR_Close(nspr_io_stub);
goto error;
}
/* import our model socket onto the current I/O stack */
connssl->handle = SSL_ImportFD(model, nspr_io);
if(!connssl->handle) {
PR_Close(nspr_io);
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]);
}
#ifdef USE_NGHTTP2
if(data->set.httpversion == CURL_HTTP_VERSION_2_0) {
#ifdef SSL_ENABLE_NPN
if(data->set.ssl_enable_npn) {
if(SSL_OptionSet(connssl->handle, SSL_ENABLE_NPN, PR_TRUE) != SECSuccess)
goto error;
}
#endif
#ifdef SSL_ENABLE_ALPN
if(data->set.ssl_enable_alpn) {
if(SSL_OptionSet(connssl->handle, SSL_ENABLE_ALPN, PR_TRUE)
!= SECSuccess)
goto error;
}
#endif
#if defined(SSL_ENABLE_NPN) || defined(SSL_ENABLE_ALPN)
if(data->set.ssl_enable_npn || data->set.ssl_enable_alpn) {
alpn_protos[cur] = NGHTTP2_PROTO_VERSION_ID_LEN;
cur++;
memcpy(&alpn_protos[cur], NGHTTP2_PROTO_VERSION_ID,
NGHTTP2_PROTO_VERSION_ID_LEN);
cur += NGHTTP2_PROTO_VERSION_ID_LEN;
alpn_protos[cur] = ALPN_HTTP_1_1_LENGTH;
cur++;
memcpy(&alpn_protos[cur], ALPN_HTTP_1_1, ALPN_HTTP_1_1_LENGTH);
if(SSL_SetNextProtoNego(connssl->handle, alpn_protos, alpn_protos_len)
!= SECSuccess)
goto error;
}
else {
infof(data, "SSL, can't negotiate HTTP/2.0 with neither NPN nor ALPN\n");
}
#endif
}
#endif
/* Force handshake on next I/O */
SSL_ResetHandshake(connssl->handle, /* asServer */ PR_FALSE);
SSL_SetURL(connssl->handle, conn->host.name);
return CURLE_OK;
error:
if(model)
PR_Close(model);
return nss_fail_connect(connssl, data, curlerr);
}
static CURLcode nss_do_connect(struct connectdata *conn, int sockindex)
{
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
struct SessionHandle *data = conn->data;
CURLcode curlerr = CURLE_SSL_CONNECT_ERROR;
PRUint32 timeout;
/* check timeout situation */
const long time_left = Curl_timeleft(data, NULL, TRUE);
if(time_left < 0L) {
failf(data, "timed out before SSL handshake");
curlerr = CURLE_OPERATION_TIMEDOUT;
goto error;
}
/* Force the handshake now */
timeout = PR_MillisecondsToInterval((PRUint32) time_left);
if(SSL_ForceHandshakeWithTimeout(connssl->handle, timeout) != SECSuccess) {
if(PR_GetError() == PR_WOULD_BLOCK_ERROR)
/* blocking direction is updated by nss_update_connecting_state() */
return CURLE_AGAIN;
else 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;
conn->recv[sockindex] = nss_recv;
conn->send[sockindex] = nss_send;
display_conn_info(conn, connssl->handle);
if(data->set.str[STRING_SSL_ISSUERCERT]) {
SECStatus ret = SECFailure;
char *nickname = dup_nickname(data, STRING_SSL_ISSUERCERT);
if(nickname) {
/* we support only nicknames in case of STRING_SSL_ISSUERCERT for now */
ret = check_issuer_cert(connssl->handle, nickname);
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:
return nss_fail_connect(connssl, data, curlerr);
}
static CURLcode nss_connect_common(struct connectdata *conn, int sockindex,
bool *done)
{
struct ssl_connect_data *connssl = &conn->ssl[sockindex];
struct SessionHandle *data = conn->data;
const bool blocking = (done == NULL);
CURLcode rv;
if(connssl->connecting_state == ssl_connect_1) {
rv = nss_setup_connect(conn, sockindex);
if(rv)
/* we do not expect CURLE_AGAIN from nss_setup_connect() */
return rv;
if(!blocking) {
/* in non-blocking mode, set NSS non-blocking mode before handshake */
rv = nss_set_nonblock(connssl, data);
if(rv)
return rv;
}
connssl->connecting_state = ssl_connect_2;
}
rv = nss_do_connect(conn, sockindex);
switch(rv) {
case CURLE_OK:
break;
case CURLE_AGAIN:
if(!blocking)
/* CURLE_AGAIN in non-blocking mode is not an error */
return CURLE_OK;
/* fall through */
default:
return rv;
}
if(blocking) {
/* in blocking mode, set NSS non-blocking mode _after_ SSL handshake */
rv = nss_set_nonblock(connssl, data);
if(rv)
return rv;
}
else
/* signal completed SSL handshake */
*done = TRUE;
connssl->connecting_state = ssl_connect_done;
return CURLE_OK;
}
CURLcode Curl_nss_connect(struct connectdata *conn, int sockindex)
{
return nss_connect_common(conn, sockindex, /* blocking */ NULL);
}
CURLcode Curl_nss_connect_nonblocking(struct connectdata *conn,
int sockindex, bool *done)
{
return nss_connect_common(conn, sockindex, done);
}
static ssize_t nss_send(struct connectdata *conn, /* connection data */
int sockindex, /* socketindex */
const void *mem, /* send this data */
size_t len, /* amount to write */
CURLcode *curlcode)
{
ssize_t rc = PR_Send(conn->ssl[sockindex].handle, mem, (int)len, 0,
PR_INTERVAL_NO_WAIT);
if(rc < 0) {
PRInt32 err = PR_GetError();
if(err == PR_WOULD_BLOCK_ERROR)
*curlcode = CURLE_AGAIN;
else {
/* print the error number and error string */
const char *err_name = nss_error_to_name(err);
infof(conn->data, "SSL write: error %d (%s)\n", err, err_name);
/* print a human-readable message describing the error if available */
nss_print_error_message(conn->data, err);
*curlcode = (is_cc_error(err))
? CURLE_SSL_CERTPROBLEM
: CURLE_SEND_ERROR;
}
return -1;
}
return rc; /* number of bytes */
}
static ssize_t nss_recv(struct connectdata * conn, /* connection data */
int num, /* socketindex */
char *buf, /* store read data here */
size_t buffersize, /* max amount to read */
CURLcode *curlcode)
{
ssize_t nread = PR_Recv(conn->ssl[num].handle, buf, (int)buffersize, 0,
PR_INTERVAL_NO_WAIT);
if(nread < 0) {
/* failed SSL read */
PRInt32 err = PR_GetError();
if(err == PR_WOULD_BLOCK_ERROR)
*curlcode = CURLE_AGAIN;
else {
/* print the error number and error string */
const char *err_name = nss_error_to_name(err);
infof(conn->data, "SSL read: errno %d (%s)\n", err, err_name);
/* print a human-readable message describing the error if available */
nss_print_error_message(conn->data, err);
*curlcode = (is_cc_error(err))
? CURLE_SSL_CERTPROBLEM
: CURLE_RECV_ERROR;
}
return -1;
}
return nread;
}
size_t Curl_nss_version(char *buffer, size_t size)
{
return snprintf(buffer, size, "NSS/%s", NSS_VERSION);
}
int Curl_nss_seed(struct SessionHandle *data)
{
/* make sure that NSS is initialized */
return !!Curl_nss_force_init(data);
}
/* data might be NULL */
int Curl_nss_random(struct SessionHandle *data,
unsigned char *entropy,
size_t length)
{
if(data)
Curl_nss_seed(data); /* Initiate the seed if not already done */
if(SECSuccess != PK11_GenerateRandom(entropy, curlx_uztosi(length))) {
/* no way to signal a failure from here, we have to abort */
failf(data, "PK11_GenerateRandom() failed, calling abort()...");
abort();
}
return 0;
}
void Curl_nss_md5sum(unsigned char *tmp, /* input */
size_t tmplen,
unsigned char *md5sum, /* output */
size_t md5len)
{
PK11Context *MD5pw = PK11_CreateDigestContext(SEC_OID_MD5);
unsigned int MD5out;
PK11_DigestOp(MD5pw, tmp, curlx_uztoui(tmplen));
PK11_DigestFinal(MD5pw, md5sum, &MD5out, curlx_uztoui(md5len));
PK11_DestroyContext(MD5pw, PR_TRUE);
}
#endif /* USE_NSS */
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