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nss: use libnssckbi.so as the default source of trust 

See https://github.com/curl/curl/pull/1414 for details.
This commit is contained in:
Kamil Dudka 2017-04-25 18:35:27 +02:00
parent 1e77c47734
commit 9549974a4c
2 changed files with 291 additions and 2 deletions
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285
0002-curl-7.54.0-libnssckbi.patch Normal file
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@ -0,0 +1,285 @@
From 50582c5be1a613ee1d212855a8945b4c8ef8950f Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Mon, 10 Apr 2017 17:05:05 +0200
Subject: [PATCH 1/2] nss: factorize out nss_{un,}load_module to separate fncs
No change of behavior is intended by this commit.
Upstream-commit: fab3d1ec650e17fd15cf8b6d4ffa5bfd523501dc
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
lib/vtls/nss.c | 83 +++++++++++++++++++++++++++++++++++++++-------------------
1 file changed, 56 insertions(+), 27 deletions(-)
diff --git a/lib/vtls/nss.c b/lib/vtls/nss.c
index 099f364..6b8f8c0 100644
--- a/lib/vtls/nss.c
+++ b/lib/vtls/nss.c
@@ -201,7 +201,7 @@ static const cipher_s cipherlist[] = {
};
static const char *pem_library = "libnsspem.so";
-static SECMODModule *mod = NULL;
+static SECMODModule *pem_module = NULL;
/* NSPR I/O layer we use to detect blocking direction during SSL handshake */
static PRDescIdentity nspr_io_identity = PR_INVALID_IO_LAYER;
@@ -600,7 +600,7 @@ static CURLcode nss_load_key(struct connectdata *conn, int sockindex,
return CURLE_SSL_CERTPROBLEM;
/* This will force the token to be seen as re-inserted */
- tmp = SECMOD_WaitForAnyTokenEvent(mod, 0, 0);
+ tmp = SECMOD_WaitForAnyTokenEvent(pem_module, 0, 0);
if(tmp)
PK11_FreeSlot(tmp);
PK11_IsPresent(slot);
@@ -1180,6 +1180,50 @@ static PRStatus nspr_io_close(PRFileDesc *fd)
return close_fn(fd);
}
+/* load a PKCS #11 module */
+static CURLcode nss_load_module(SECMODModule **pmod, const char *library,
+ const char *name)
+{
+ char *config_string;
+ SECMODModule *module = *pmod;
+ if(module)
+ /* already loaded */
+ return CURLE_OK;
+
+ config_string = aprintf("library=%s name=%s", library, name);
+ if(!config_string)
+ return CURLE_OUT_OF_MEMORY;
+
+ module = SECMOD_LoadUserModule(config_string, NULL, PR_FALSE);
+ free(config_string);
+
+ if(module && module->loaded) {
+ /* loaded successfully */
+ *pmod = module;
+ return CURLE_OK;
+ }
+
+ if(module)
+ SECMOD_DestroyModule(module);
+ return CURLE_FAILED_INIT;
+}
+
+/* unload a PKCS #11 module */
+static void nss_unload_module(SECMODModule **pmod)
+{
+ SECMODModule *module = *pmod;
+ if(!module)
+ /* not loaded */
+ return;
+
+ if(SECMOD_UnloadUserModule(module) != SECSuccess)
+ /* unload failed */
+ return;
+
+ SECMOD_DestroyModule(module);
+ *pmod = NULL;
+}
+
/* data might be NULL */
static CURLcode nss_init_core(struct Curl_easy *data, const char *cert_dir)
{
@@ -1327,10 +1371,7 @@ void Curl_nss_cleanup(void)
* the certificates. */
SSL_ClearSessionCache();
- if(mod && SECSuccess == SECMOD_UnloadUserModule(mod)) {
- SECMOD_DestroyModule(mod);
- mod = NULL;
- }
+ nss_unload_module(&pem_module);
NSS_ShutdownContext(nss_context);
nss_context = NULL;
}
@@ -1685,29 +1726,17 @@ static CURLcode nss_setup_connect(struct connectdata *conn, int sockindex)
goto error;
}
- result = 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);
+
+ result = nss_load_module(&pem_module, pem_library, "PEM");
PR_Unlock(nss_initlock);
+ if(result == CURLE_FAILED_INIT)
+ infof(data, "WARNING: failed to load NSS PEM library %s. Using "
+ "OpenSSL PEM certificates will not work.\n", pem_library);
+ else if(result)
+ goto error;
+
+ result = CURLE_SSL_CONNECT_ERROR;
model = PR_NewTCPSocket();
if(!model)
--
2.9.3
From cf6f9017f0e144ad510fd5913b44b22a2146dd4b Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Mon, 10 Apr 2017 17:40:30 +0200
Subject: [PATCH 2/2] nss: load libnssckbi.so if no other trust is specified
The module contains a more comprehensive set of trust information than
supported by nss-pem, because libnssckbi.so also includes information
about distrusted certificates.
Reviewed-by: Kai Engert
Closes #1414
Upstream-commit: e3e8d0204b72509cfd63d97a159d1ac3fdea703b
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
docs/libcurl/opts/CURLOPT_CAINFO.3 | 5 ++++
lib/vtls/nss.c | 51 ++++++++++++++++++++++++++++++++------
2 files changed, 48 insertions(+), 8 deletions(-)
diff --git a/docs/libcurl/opts/CURLOPT_CAINFO.3 b/docs/libcurl/opts/CURLOPT_CAINFO.3
index 91b7e23..85436c3 100644
--- a/docs/libcurl/opts/CURLOPT_CAINFO.3
+++ b/docs/libcurl/opts/CURLOPT_CAINFO.3
@@ -41,6 +41,11 @@ is assumed to be stored, as established at build time.
If curl is built against the NSS SSL library, the NSS PEM PKCS#11 module
(libnsspem.so) needs to be available for this option to work properly.
+Starting with curl-7.55.0, if both \fICURLOPT_CAINFO(3)\fP and
+\fICURLOPT_CAPATH(3)\fP are unset, NSS-linked libcurl tries to load
+libnssckbi.so, which contains a more comprehensive set of trust information
+than supported by nss-pem, because libnssckbi.so also includes information
+about distrusted certificates.
(iOS and macOS only) If curl is built against Secure Transport, then this
option is supported for backward compatibility with other SSL engines, but it
diff --git a/lib/vtls/nss.c b/lib/vtls/nss.c
index 6b8f8c0..62665e7 100644
--- a/lib/vtls/nss.c
+++ b/lib/vtls/nss.c
@@ -81,6 +81,7 @@
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;
@@ -203,6 +204,9 @@ static const cipher_s cipherlist[] = {
static const char *pem_library = "libnsspem.so";
static SECMODModule *pem_module = NULL;
+static const char *trust_library = "libnssckbi.so";
+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;
@@ -1333,6 +1337,7 @@ int Curl_nss_init(void)
nss_initlock = PR_NewLock();
nss_crllock = PR_NewLock();
nss_findslot_lock = PR_NewLock();
+ nss_trustload_lock = PR_NewLock();
}
/* We will actually initialize NSS later */
@@ -1372,6 +1377,7 @@ void Curl_nss_cleanup(void)
SSL_ClearSessionCache();
nss_unload_module(&pem_module);
+ nss_unload_module(&trust_module);
NSS_ShutdownContext(nss_context);
nss_context = NULL;
}
@@ -1384,6 +1390,7 @@ void Curl_nss_cleanup(void)
PR_DestroyLock(nss_initlock);
PR_DestroyLock(nss_crllock);
PR_DestroyLock(nss_findslot_lock);
+ PR_DestroyLock(nss_trustload_lock);
nss_initlock = NULL;
initialized = 0;
@@ -1505,12 +1512,44 @@ static CURLcode nss_load_ca_certificates(struct connectdata *conn,
struct Curl_easy *data = conn->data;
const char *cafile = SSL_CONN_CONFIG(CAfile);
const char *capath = SSL_CONN_CONFIG(CApath);
+ bool use_trust_module;
+ CURLcode result = CURLE_OK;
- if(cafile) {
- CURLcode result = nss_load_cert(&conn->ssl[sockindex], cafile, PR_TRUE);
- if(result)
- return result;
+ /* treat empty string as unset */
+ if(cafile && !cafile[0])
+ cafile = NULL;
+ if(capath && !capath[0])
+ capath = NULL;
+
+ infof(data, " CAfile: %s\n CApath: %s\n",
+ cafile ? cafile : "none",
+ capath ? capath : "none");
+
+ /* load libnssckbi.so if no other trust roots were specified */
+ use_trust_module = !cafile && !capath;
+
+ PR_Lock(nss_trustload_lock);
+ if(use_trust_module && !trust_module) {
+ /* libnssckbi.so needed but not yet loaded --> load it! */
+ result = nss_load_module(&trust_module, trust_library, "trust");
+ infof(data, "%s %s\n", (result) ? "failed to load" : "loaded",
+ trust_library);
+ if(result == CURLE_FAILED_INIT)
+ /* make the error non-fatal if we are not going to verify peer */
+ result = CURLE_SSL_CACERT_BADFILE;
}
+ else if(!use_trust_module && trust_module) {
+ /* libnssckbi.so not needed but already loaded --> unload it! */
+ infof(data, "unloading %s\n", trust_library);
+ nss_unload_module(&trust_module);
+ }
+ PR_Unlock(nss_trustload_lock);
+
+ if(cafile)
+ result = nss_load_cert(&conn->ssl[sockindex], cafile, PR_TRUE);
+
+ if(result)
+ return result;
if(capath) {
struct_stat st;
@@ -1544,10 +1583,6 @@ static CURLcode nss_load_ca_certificates(struct connectdata *conn,
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;
}
--
2.9.3

8
curl.spec
View File

@ -9,6 +9,9 @@ Source: https://curl.haxx.se/download/%{name}-%{version}.tar.lzma
# nss: do not leak PKCS #11 slot while loading a key (#1444860)
Patch1: 0001-curl-7.54.0-nss-pem-slot-leak.patch
# nss: use libnssckbi.so as the default source of trust
Patch2: 0002-curl-7.54.0-libnssckbi.patch
# patch making libcurl multilib ready
Patch101: 0101-curl-7.32.0-multilib.patch
@ -142,6 +145,7 @@ be installed.
# upstream patches
%patch1 -p1
%patch2 -p1
# Fedora patches
%patch101 -p1
@ -173,10 +177,9 @@ export common_configure_opts=" \
--enable-symbol-hiding \
--enable-ipv6 \
--enable-threaded-resolver \
--with-ca-bundle=%{_sysconfdir}/pki/tls/certs/ca-bundle.crt \
--with-gssapi \
--with-nghttp2 \
--without-ssl --with-nss"
--without-ssl --with-nss --without-ca-bundle"
%global _configure ../configure
@ -302,6 +305,7 @@ install -m 644 docs/libcurl/libcurl.m4 $RPM_BUILD_ROOT%{_datadir}/aclocal
%changelog
* Tue Apr 25 2017 Kamil Dudka <kdudka@redhat.com> 7.54.0-2
- nss: use libnssckbi.so as the default source of trust
- nss: do not leak PKCS #11 slot while loading a key (#1444860)
* Thu Apr 20 2017 Kamil Dudka <kdudka@redhat.com> 7.54.0-1