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nss.c
2537 lines (2152 loc) · 74.9 KB
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nss.c
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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2022, 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 https://curl.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.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
/*
* 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 "strcase.h"
#include "select.h"
#include "vtls.h"
#include "llist.h"
#include "multiif.h"
#include "curl_printf.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 <keyhi.h> /* for SECKEY_DestroyPublicKey() */
#include <private/pprio.h> /* for PR_ImportTCPSocket */
#define NSSVERNUM ((NSS_VMAJOR<<16)|(NSS_VMINOR<<8)|NSS_VPATCH)
#if NSSVERNUM >= 0x030f00 /* 3.15.0 */
#include <ocsp.h>
#endif
#include "strcase.h"
#include "warnless.h"
#include "x509asn1.h"
/* The last #include files should be: */
#include "curl_memory.h"
#include "memdebug.h"
#define SSL_DIR "/etc/pki/nssdb"
/* enough to fit the string "PEM Token #[0|1]" */
#define SLOTSIZE 13
struct ssl_backend_data {
PRFileDesc *handle;
char *client_nickname;
struct Curl_easy *data;
struct Curl_llist obj_list;
PK11GenericObject *obj_clicert;
};
static PRLock *nss_initlock = NULL;
static PRLock *nss_crllock = NULL;
static PRLock *nss_findslot_lock = NULL;
static PRLock *nss_trustload_lock = NULL;
static struct Curl_llist nss_crl_list;
static NSSInitContext *nss_context = NULL;
static volatile int initialized = 0;
/* type used to wrap pointers as list nodes */
struct ptr_list_wrap {
void *ptr;
struct Curl_llist_element node;
};
struct cipher_s {
const char *name;
int num;
};
#define PK11_SETATTRS(_attr, _idx, _type, _val, _len) do { \
CK_ATTRIBUTE *ptr = (_attr) + ((_idx)++); \
ptr->type = (_type); \
ptr->pValue = (_val); \
ptr->ulValueLen = (_len); \
} while(0)
#define CERT_NewTempCertificate __CERT_NewTempCertificate
#define NUM_OF_CIPHERS sizeof(cipherlist)/sizeof(cipherlist[0])
static const struct 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},
{"dhe_rsa_3des_sha", SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA},
{"dhe_dss_3des_sha", SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA},
{"dhe_rsa_des_sha", SSL_DHE_RSA_WITH_DES_CBC_SHA},
{"dhe_dss_des_sha", SSL_DHE_DSS_WITH_DES_CBC_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},
/* Ephemeral DH with RC4 bulk encryption */
{"dhe_dss_rc4_128_sha", TLS_DHE_DSS_WITH_RC4_128_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},
{"ecdhe_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
#ifdef TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
/* cipher suites using SHA384 */
{"rsa_aes_256_gcm_sha_384", TLS_RSA_WITH_AES_256_GCM_SHA384},
{"dhe_rsa_aes_256_gcm_sha_384", TLS_DHE_RSA_WITH_AES_256_GCM_SHA384},
{"dhe_dss_aes_256_gcm_sha_384", TLS_DHE_DSS_WITH_AES_256_GCM_SHA384},
{"ecdhe_ecdsa_aes_256_sha_384", TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384},
{"ecdhe_rsa_aes_256_sha_384", TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384},
{"ecdhe_ecdsa_aes_256_gcm_sha_384", TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384},
{"ecdhe_rsa_aes_256_gcm_sha_384", TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384},
#endif
#ifdef TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256
/* chacha20-poly1305 cipher suites */
{"ecdhe_rsa_chacha20_poly1305_sha_256",
TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256},
{"ecdhe_ecdsa_chacha20_poly1305_sha_256",
TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256},
{"dhe_rsa_chacha20_poly1305_sha_256",
TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256},
#endif
#ifdef TLS_AES_256_GCM_SHA384
{"aes_128_gcm_sha_256", TLS_AES_128_GCM_SHA256},
{"aes_256_gcm_sha_384", TLS_AES_256_GCM_SHA384},
{"chacha20_poly1305_sha_256", TLS_CHACHA20_POLY1305_SHA256},
#endif
#ifdef TLS_DHE_DSS_WITH_AES_128_CBC_SHA256
/* AES CBC cipher suites in RFC 5246. Introduced in NSS release 3.20 */
{"dhe_dss_aes_128_sha_256", TLS_DHE_DSS_WITH_AES_128_CBC_SHA256},
{"dhe_dss_aes_256_sha_256", TLS_DHE_DSS_WITH_AES_256_CBC_SHA256},
#endif
#ifdef TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA
/* Camellia cipher suites in RFC 4132/5932.
Introduced in NSS release 3.12 */
{"dhe_rsa_camellia_128_sha", TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA},
{"dhe_dss_camellia_128_sha", TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA},
{"dhe_rsa_camellia_256_sha", TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA},
{"dhe_dss_camellia_256_sha", TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA},
{"rsa_camellia_128_sha", TLS_RSA_WITH_CAMELLIA_128_CBC_SHA},
{"rsa_camellia_256_sha", TLS_RSA_WITH_CAMELLIA_256_CBC_SHA},
#endif
#ifdef TLS_RSA_WITH_SEED_CBC_SHA
/* SEED cipher suite in RFC 4162. Introduced in NSS release 3.12.3 */
{"rsa_seed_sha", TLS_RSA_WITH_SEED_CBC_SHA},
#endif
};
#if defined(WIN32)
static const char *pem_library = "nsspem.dll";
static const char *trust_library = "nssckbi.dll";
#elif defined(__APPLE__)
static const char *pem_library = "libnsspem.dylib";
static const char *trust_library = "libnssckbi.dylib";
#else
static const char *pem_library = "libnsspem.so";
static const char *trust_library = "libnssckbi.so";
#endif
static SECMODModule *pem_module = NULL;
static SECMODModule *trust_module = 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 Curl_easy *data, PRUint32 err)
{
failf(data, "%s", PR_ErrorToString(err, PR_LANGUAGE_I_DEFAULT));
}
static char *nss_sslver_to_name(PRUint16 nssver)
{
switch(nssver) {
case SSL_LIBRARY_VERSION_2:
return strdup("SSLv2");
case SSL_LIBRARY_VERSION_3_0:
return strdup("SSLv3");
case SSL_LIBRARY_VERSION_TLS_1_0:
return strdup("TLSv1.0");
#ifdef SSL_LIBRARY_VERSION_TLS_1_1
case SSL_LIBRARY_VERSION_TLS_1_1:
return strdup("TLSv1.1");
#endif
#ifdef SSL_LIBRARY_VERSION_TLS_1_2
case SSL_LIBRARY_VERSION_TLS_1_2:
return strdup("TLSv1.2");
#endif
#ifdef SSL_LIBRARY_VERSION_TLS_1_3
case SSL_LIBRARY_VERSION_TLS_1_3:
return strdup("TLSv1.3");
#endif
default:
return curl_maprintf("0x%04x", nssver);
}
}
/* the longest cipher name this supports */
#define MAX_CIPHER_LENGTH 128
static SECStatus set_ciphers(struct Curl_easy *data, PRFileDesc *model,
const char *cipher_list)
{
unsigned int i;
const char *cipher;
/* use accessors to avoid dynamic linking issues after an update of NSS */
const PRUint16 num_implemented_ciphers = SSL_GetNumImplementedCiphers();
const PRUint16 *implemented_ciphers = SSL_GetImplementedCiphers();
if(!implemented_ciphers)
return SECFailure;
/* 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 < num_implemented_ciphers; i++) {
SSL_CipherPrefSet(model, implemented_ciphers[i], PR_FALSE);
}
cipher = cipher_list;
while(cipher && cipher[0]) {
const char *end;
char name[MAX_CIPHER_LENGTH + 1];
size_t len;
bool found = FALSE;
while((*cipher) && (ISBLANK(*cipher)))
++cipher;
end = strpbrk(cipher, ":, ");
if(end)
len = end - cipher;
else
len = strlen(cipher);
if(len > MAX_CIPHER_LENGTH) {
failf(data, "Bad cipher list");
return SECFailure;
}
else if(len) {
memcpy(name, cipher, len);
name[len] = 0;
for(i = 0; i<NUM_OF_CIPHERS; i++) {
if(strcasecompare(name, cipherlist[i].name)) {
/* Enable the selected cipher */
if(SSL_CipherPrefSet(model, cipherlist[i].num, PR_TRUE) !=
SECSuccess) {
failf(data, "cipher-suite not supported by NSS: %s", name);
return SECFailure;
}
found = TRUE;
break;
}
}
}
if(!found && len) {
failf(data, "Unknown cipher: %s", name);
return SECFailure;
}
if(end)
cipher = ++end;
else
break;
}
return SECSuccess;
}
/*
* Return true if at least one cipher-suite is enabled. Used to determine
* if we need to call NSS_SetDomesticPolicy() to enable the default ciphers.
*/
static bool any_cipher_enabled(void)
{
unsigned int i;
for(i = 0; i<NUM_OF_CIPHERS; i++) {
PRInt32 policy = 0;
SSL_CipherPolicyGet(cipherlist[i].num, &policy);
if(policy)
return TRUE;
}
return FALSE;
}
/*
* 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)
return 0;
if(stat(filename, &st) == 0)
if(S_ISREG(st.st_mode) || S_ISFIFO(st.st_mode) || S_ISCHR(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 Curl_easy *data, const char *str)
{
const char *n;
if(!is_file(str))
/* no such file exists, use the string as nickname */
return strdup(str);
/* search the first slash; we require at least one slash in a file name */
n = strchr(str, '/');
if(!n) {
infof(data, "WARNING: certificate file name \"%s\" handled as nickname; "
"please use \"./%s\" to force file name", str, str);
return strdup(str);
}
/* we'll use the PEM reader to read the certificate from file */
return NULL;
}
/* Lock/unlock wrapper for PK11_FindSlotByName() to work around race condition
* in nssSlot_IsTokenPresent() causing spurious SEC_ERROR_NO_TOKEN. For more
* details, go to <https://bugzilla.mozilla.org/1297397>.
*/
static PK11SlotInfo* nss_find_slot_by_name(const char *slot_name)
{
PK11SlotInfo *slot;
PR_Lock(nss_findslot_lock);
slot = PK11_FindSlotByName(slot_name);
PR_Unlock(nss_findslot_lock);
return slot;
}
/* wrap 'ptr' as list node and tail-insert into 'list' */
static CURLcode insert_wrapped_ptr(struct Curl_llist *list, void *ptr)
{
struct ptr_list_wrap *wrap = malloc(sizeof(*wrap));
if(!wrap)
return CURLE_OUT_OF_MEMORY;
wrap->ptr = ptr;
Curl_llist_insert_next(list, list->tail, wrap, &wrap->node);
return CURLE_OK;
}
/* 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 nss_close(). */
static CURLcode nss_create_object(struct ssl_connect_data *connssl,
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 result = (cacert)
? CURLE_SSL_CACERT_BADFILE
: CURLE_SSL_CERTPROBLEM;
const int slot_id = (cacert) ? 0 : 1;
char *slot_name = aprintf("PEM Token #%d", slot_id);
struct ssl_backend_data *backend = connssl->backend;
DEBUGASSERT(backend);
if(!slot_name)
return CURLE_OUT_OF_MEMORY;
slot = nss_find_slot_by_name(slot_name);
free(slot_name);
if(!slot)
return result;
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,
(CK_ULONG)strlen(filename) + 1);
if(CKO_CERTIFICATE == obj_class) {
CK_BBOOL *pval = (cacert) ? (&cktrue) : (&ckfalse);
PK11_SETATTRS(attrs, attr_cnt, CKA_TRUST, pval, sizeof(*pval));
}
/* PK11_CreateManagedGenericObject() was introduced in NSS 3.34 because
* PK11_DestroyGenericObject() does not release resources allocated by
* PK11_CreateGenericObject() early enough. */
obj =
#ifdef HAVE_PK11_CREATEMANAGEDGENERICOBJECT
PK11_CreateManagedGenericObject
#else
PK11_CreateGenericObject
#endif
(slot, attrs, attr_cnt, PR_FALSE);
PK11_FreeSlot(slot);
if(!obj)
return result;
if(insert_wrapped_ptr(&backend->obj_list, obj) != CURLE_OK) {
PK11_DestroyGenericObject(obj);
return CURLE_OUT_OF_MEMORY;
}
if(!cacert && CKO_CERTIFICATE == obj_class)
/* store reference to a client certificate */
backend->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 nss_close() */
static void nss_destroy_object(void *user, void *ptr)
{
struct ptr_list_wrap *wrap = (struct ptr_list_wrap *) ptr;
PK11GenericObject *obj = (PK11GenericObject *) wrap->ptr;
(void) user;
PK11_DestroyGenericObject(obj);
free(wrap);
}
/* same as nss_destroy_object() but for CRL items */
static void nss_destroy_crl_item(void *user, void *ptr)
{
struct ptr_list_wrap *wrap = (struct ptr_list_wrap *) ptr;
SECItem *crl_der = (SECItem *) wrap->ptr;
(void) user;
SECITEM_FreeItem(crl_der, PR_TRUE);
free(wrap);
}
static CURLcode nss_load_cert(struct ssl_connect_data *ssl,
const char *filename, PRBool cacert)
{
CURLcode result = (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))
result = nss_create_object(ssl, CKO_CERTIFICATE, filename, cacert);
if(!result && !cacert) {
/* we have successfully loaded a client certificate */
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) {
CERTCertificate *cert = PK11_FindCertFromNickname(nickname, NULL);
if(cert)
CERT_DestroyCertificate(cert);
free(nickname);
}
}
return result;
}
/* 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_OK;
}
/* acquire lock before call of CERT_CacheCRL() and accessing nss_crl_list */
PR_Lock(nss_crllock);
if(SECSuccess != CERT_CacheCRL(db, crl_der)) {
/* unable to cache CRL */
SECITEM_FreeItem(crl_der, PR_TRUE);
PR_Unlock(nss_crllock);
return CURLE_SSL_CRL_BADFILE;
}
/* store the CRL item so that we can free it in nss_cleanup() */
if(insert_wrapped_ptr(&nss_crl_list, crl_der) != CURLE_OK) {
if(SECSuccess == CERT_UncacheCRL(db, crl_der))
SECITEM_FreeItem(crl_der, PR_TRUE);
PR_Unlock(nss_crllock);
return CURLE_OUT_OF_MEMORY;
}
/* 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 Curl_easy *data, struct connectdata *conn,
int sockindex, char *key_file)
{
PK11SlotInfo *slot, *tmp;
SECStatus status;
CURLcode result;
struct ssl_connect_data *ssl = conn->ssl;
(void)sockindex; /* unused */
result = nss_create_object(ssl, CKO_PRIVATE_KEY, key_file, FALSE);
if(result) {
PR_SetError(SEC_ERROR_BAD_KEY, 0);
return result;
}
slot = nss_find_slot_by_name("PEM Token #1");
if(!slot)
return CURLE_SSL_CERTPROBLEM;
/* This will force the token to be seen as re-inserted */
tmp = SECMOD_WaitForAnyTokenEvent(pem_module, 0, 0);
if(tmp)
PK11_FreeSlot(tmp);
if(!PK11_IsPresent(slot)) {
PK11_FreeSlot(slot);
return CURLE_SSL_CERTPROBLEM;
}
status = PK11_Authenticate(slot, PR_TRUE, SSL_SET_OPTION(key_passwd));
PK11_FreeSlot(slot);
return (SECSuccess == status) ? CURLE_OK : CURLE_SSL_CERTPROBLEM;
}
static int display_error(struct Curl_easy *data, PRInt32 err,
const char *filename)
{
switch(err) {
case SEC_ERROR_BAD_PASSWORD:
failf(data, "Unable to load client key: Incorrect password");
return 1;
case SEC_ERROR_UNKNOWN_CERT:
failf(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 Curl_easy *data, struct connectdata *conn,
int sockindex, char *cert_file, char *key_file)
{
CURLcode result;
if(cert_file) {
result = nss_load_cert(&conn->ssl[sockindex], cert_file, PR_FALSE);
if(result) {
const PRErrorCode err = PR_GetError();
if(!display_error(data, 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 result;
}
}
if(key_file || (is_file(cert_file))) {
if(key_file)
result = nss_load_key(data, conn, sockindex, key_file);
else
/* In case the cert file also has the key */
result = nss_load_key(data, conn, sockindex, cert_file);
if(result) {
const PRErrorCode err = PR_GetError();
if(!display_error(data, 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 result;
}
}
return CURLE_OK;
}
static char *nss_get_password(PK11SlotInfo *slot, PRBool retry, void *arg)
{
(void)slot; /* unused */
if(retry || !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 Curl_easy *data = (struct Curl_easy *)arg;
struct connectdata *conn = data->conn;
#ifdef SSL_ENABLE_OCSP_STAPLING
if(SSL_CONN_CONFIG(verifystatus)) {
SECStatus cacheResult;
const SECItemArray *csa = SSL_PeerStapledOCSPResponses(fd);
if(!csa) {
failf(data, "Invalid OCSP response");
return SECFailure;
}
if(csa->len == 0) {
failf(data, "No OCSP response received");
return SECFailure;
}
cacheResult = CERT_CacheOCSPResponseFromSideChannel(
CERT_GetDefaultCertDB(), SSL_PeerCertificate(fd),
PR_Now(), &csa->items[0], arg
);
if(cacheResult != SECSuccess) {
failf(data, "Invalid OCSP response");
return cacheResult;
}
}
#endif
if(!SSL_CONN_CONFIG(verifypeer)) {
infof(data, "skipping SSL peer certificate verification");
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)
{
struct Curl_easy *data = (struct Curl_easy *)arg;
struct connectdata *conn = data->conn;
unsigned int buflenmax = 50;
unsigned char buf[50];
unsigned int buflen;
SSLNextProtoState state;
if(!conn->bits.tls_enable_alpn) {
return;
}
if(SSL_GetNextProto(sock, &state, buf, &buflen, buflenmax) == SECSuccess) {
switch(state) {
#if NSSVERNUM >= 0x031a00 /* 3.26.0 */
/* used by NSS internally to implement 0-RTT */
case SSL_NEXT_PROTO_EARLY_VALUE:
/* fall through! */
#endif
case SSL_NEXT_PROTO_NO_SUPPORT:
case SSL_NEXT_PROTO_NO_OVERLAP:
infof(data, VTLS_INFOF_NO_ALPN);
return;
#ifdef SSL_ENABLE_ALPN
case SSL_NEXT_PROTO_SELECTED:
infof(data, VTLS_INFOF_ALPN_ACCEPTED_LEN_1STR, buflen, buf);
break;
#endif
default:
/* ignore SSL_NEXT_PROTO_NEGOTIATED */
break;
}
#ifdef USE_HTTP2
if(buflen == ALPN_H2_LENGTH &&
!memcmp(ALPN_H2, buf, ALPN_H2_LENGTH)) {
conn->alpn = CURL_HTTP_VERSION_2;
}
else
#endif
if(buflen == ALPN_HTTP_1_1_LENGTH &&
!memcmp(ALPN_HTTP_1_1, buf, ALPN_HTTP_1_1_LENGTH)) {
conn->alpn = CURL_HTTP_VERSION_1_1;
}
/* This callback might get called when PR_Recv() is used within
* close_one() during a connection shutdown. At that point there might not
* be any "bundle" associated with the connection anymore.
*/
if(conn->bundle)
Curl_multiuse_state(data, conn->alpn == CURL_HTTP_VERSION_2 ?
BUNDLE_MULTIPLEX : BUNDLE_NO_MULTIUSE);
}
}
#if NSSVERNUM >= 0x030f04 /* 3.15.4 */
static SECStatus CanFalseStartCallback(PRFileDesc *sock, void *client_data,
PRBool *canFalseStart)
{
struct Curl_easy *data = (struct Curl_easy *)client_data;
SSLChannelInfo channelInfo;
SSLCipherSuiteInfo cipherInfo;
SECStatus rv;
PRBool negotiatedExtension;
*canFalseStart = PR_FALSE;
if(SSL_GetChannelInfo(sock, &channelInfo, sizeof(channelInfo)) != SECSuccess)
return SECFailure;
if(SSL_GetCipherSuiteInfo(channelInfo.cipherSuite, &cipherInfo,
sizeof(cipherInfo)) != SECSuccess)
return SECFailure;
/* Prevent version downgrade attacks from TLS 1.2, and avoid False Start for
* TLS 1.3 and later. See https://bugzilla.mozilla.org/show_bug.cgi?id=861310
*/
if(channelInfo.protocolVersion != SSL_LIBRARY_VERSION_TLS_1_2)
goto end;
/* Only allow ECDHE key exchange algorithm.
* See https://bugzilla.mozilla.org/show_bug.cgi?id=952863 */
if(cipherInfo.keaType != ssl_kea_ecdh)
goto end;
/* Prevent downgrade attacks on the symmetric cipher. We do not allow CBC
* mode due to BEAST, POODLE, and other attacks on the MAC-then-Encrypt
* design. See https://bugzilla.mozilla.org/show_bug.cgi?id=1109766 */
if(cipherInfo.symCipher != ssl_calg_aes_gcm)
goto end;
/* Enforce ALPN to do False Start, as an indicator of server
compatibility. */
rv = SSL_HandshakeNegotiatedExtension(sock, ssl_app_layer_protocol_xtn,
&negotiatedExtension);
if(rv != SECSuccess || !negotiatedExtension) {
rv = SSL_HandshakeNegotiatedExtension(sock, ssl_next_proto_nego_xtn,
&negotiatedExtension);
}
if(rv != SECSuccess || !negotiatedExtension)
goto end;
*canFalseStart = PR_TRUE;
infof(data, "Trying TLS False Start");
end:
return SECSuccess;
}
#endif
static void display_cert_info(struct Curl_easy *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, "subject: %s", subject);
CERT_GetCertTimes(cert, ¬Before, ¬After);
PR_ExplodeTime(notBefore, PR_GMTParameters, &printableTime);
PR_FormatTime(timeString, 256, "%b %d %H:%M:%S %Y GMT", &printableTime);
infof(data, " start date: %s", timeString);
PR_ExplodeTime(notAfter, PR_GMTParameters, &printableTime);
PR_FormatTime(timeString, 256, "%b %d %H:%M:%S %Y GMT", &printableTime);
infof(data, " expire date: %s", timeString);
infof(data, " common name: %s", common_name);
infof(data, " issuer: %s", issuer);
PR_Free(subject);
PR_Free(issuer);
PR_Free(common_name);
}
/* A number of certs that will never occur in a real server handshake */
#define TOO_MANY_CERTS 300
static CURLcode display_conn_info(struct Curl_easy *data, PRFileDesc *sock)
{
CURLcode result = CURLE_OK;
SSLChannelInfo channel;
SSLCipherSuiteInfo suite;
CERTCertificate *cert;
CERTCertificate *cert2;
CERTCertificate *cert3;
PRTime now;