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do not crash if MD5 fingerprint is not provided by libssh2

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This commit is contained in:
Kamil Dudka 2012-10-01 13:15:29 +02:00
parent ae93943914
commit 7151fdb83e
2 changed files with 203 additions and 1 deletions
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197
0002-curl-7.27.0-f05e5136.patch Normal file
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@ -0,0 +1,197 @@
From ce515e993fe7bc7e95549317fe5180b196454d4c Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Wed, 12 Sep 2012 16:06:18 +0200
Subject: [PATCH 1/3] ssh: move the fingerprint checking code to a separate fnc
---
lib/ssh.c | 71 +++++++++++++++++++++++++++++++++---------------------------
1 files changed, 39 insertions(+), 32 deletions(-)
diff --git a/lib/ssh.c b/lib/ssh.c
index c76a48e..4455d44 100644
--- a/lib/ssh.c
+++ b/lib/ssh.c
@@ -635,6 +635,43 @@ static CURLcode ssh_knownhost(struct connectdata *conn)
return result;
}
+static bool ssh_check_fingerprint(struct connectdata *conn)
+{
+ struct ssh_conn *sshc = &conn->proto.sshc;
+ struct SessionHandle *data = conn->data;
+ const char *pubkey_md5 = data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5];
+ char md5buffer[33];
+ int i;
+
+ const char *fingerprint = libssh2_hostkey_hash(sshc->ssh_session,
+ LIBSSH2_HOSTKEY_HASH_MD5);
+
+ /* The fingerprint points to static storage (!), don't free() it. */
+ for(i = 0; i < 16; i++)
+ snprintf(&md5buffer[i*2], 3, "%02x", (unsigned char) fingerprint[i]);
+ infof(data, "SSH MD5 fingerprint: %s\n", md5buffer);
+
+ /* Before we authenticate we check the hostkey's MD5 fingerprint
+ * against a known fingerprint, if available.
+ */
+ if(pubkey_md5 && strlen(pubkey_md5) == 32) {
+ if(!strequal(md5buffer, pubkey_md5)) {
+ failf(data,
+ "Denied establishing ssh session: mismatch md5 fingerprint. "
+ "Remote %s is not equal to %s", md5buffer, pubkey_md5);
+ state(conn, SSH_SESSION_FREE);
+ sshc->actualcode = CURLE_PEER_FAILED_VERIFICATION;
+ return sshc->actualcode;
+ }
+ else {
+ infof(data, "MD5 checksum match!\n");
+ /* as we already matched, we skip the check for known hosts */
+ return CURLE_OK;
+ }
+ }
+ else
+ return ssh_knownhost(conn);
+}
/*
* ssh_statemach_act() runs the SSH state machine as far as it can without
@@ -650,10 +687,8 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
struct SSHPROTO *sftp_scp = data->state.proto.ssh;
struct ssh_conn *sshc = &conn->proto.sshc;
curl_socket_t sock = conn->sock[FIRSTSOCKET];
- const char *fingerprint;
- char md5buffer[33];
char *new_readdir_line;
- int rc = LIBSSH2_ERROR_NONE, i;
+ int rc = LIBSSH2_ERROR_NONE;
int err;
int seekerr = CURL_SEEKFUNC_OK;
*block = 0; /* we're not blocking by default */
@@ -694,35 +729,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
* against our known hosts. How that is handled (reading from file,
* whatever) is up to us.
*/
- fingerprint = libssh2_hostkey_hash(sshc->ssh_session,
- LIBSSH2_HOSTKEY_HASH_MD5);
-
- /* The fingerprint points to static storage (!), don't free() it. */
- for(i = 0; i < 16; i++)
- snprintf(&md5buffer[i*2], 3, "%02x", (unsigned char) fingerprint[i]);
- infof(data, "SSH MD5 fingerprint: %s\n", md5buffer);
-
- /* Before we authenticate we check the hostkey's MD5 fingerprint
- * against a known fingerprint, if available.
- */
- if(data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5] &&
- strlen(data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5]) == 32) {
- if(!strequal(md5buffer,
- data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5])) {
- failf(data,
- "Denied establishing ssh session: mismatch md5 fingerprint. "
- "Remote %s is not equal to %s",
- md5buffer, data->set.str[STRING_SSH_HOST_PUBLIC_KEY_MD5]);
- state(conn, SSH_SESSION_FREE);
- result = sshc->actualcode = CURLE_PEER_FAILED_VERIFICATION;
- }
- else
- infof(data, "MD5 checksum match!\n");
- /* as we already matched, we skip the check for known hosts */
- }
- else
- result = ssh_knownhost(conn);
-
+ result = ssh_check_fingerprint(conn);
if(!result)
state(conn, SSH_AUTHLIST);
break;
--
1.7.1
From f05e51362f310cb04b0ad8d086b9cf693aad5c9d Mon Sep 17 00:00:00 2001
From: Kamil Dudka <kdudka@redhat.com>
Date: Wed, 12 Sep 2012 16:18:36 +0200
Subject: [PATCH 2/3] ssh: do not crash if MD5 fingerprint is not provided by libssh2
The MD5 fingerprint cannot be computed when running in FIPS mode.
---
lib/ssh.c | 22 ++++++++++++++--------
1 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/lib/ssh.c b/lib/ssh.c
index 4455d44..466566c 100644
--- a/lib/ssh.c
+++ b/lib/ssh.c
@@ -646,19 +646,25 @@ static bool ssh_check_fingerprint(struct connectdata *conn)
const char *fingerprint = libssh2_hostkey_hash(sshc->ssh_session,
LIBSSH2_HOSTKEY_HASH_MD5);
- /* The fingerprint points to static storage (!), don't free() it. */
- for(i = 0; i < 16; i++)
- snprintf(&md5buffer[i*2], 3, "%02x", (unsigned char) fingerprint[i]);
- infof(data, "SSH MD5 fingerprint: %s\n", md5buffer);
+ if(fingerprint) {
+ /* The fingerprint points to static storage (!), don't free() it. */
+ for(i = 0; i < 16; i++)
+ snprintf(&md5buffer[i*2], 3, "%02x", (unsigned char) fingerprint[i]);
+ infof(data, "SSH MD5 fingerprint: %s\n", md5buffer);
+ }
/* Before we authenticate we check the hostkey's MD5 fingerprint
* against a known fingerprint, if available.
*/
if(pubkey_md5 && strlen(pubkey_md5) == 32) {
- if(!strequal(md5buffer, pubkey_md5)) {
- failf(data,
- "Denied establishing ssh session: mismatch md5 fingerprint. "
- "Remote %s is not equal to %s", md5buffer, pubkey_md5);
+ if(!fingerprint || !strequal(md5buffer, pubkey_md5)) {
+ if(fingerprint)
+ failf(data,
+ "Denied establishing ssh session: mismatch md5 fingerprint. "
+ "Remote %s is not equal to %s", md5buffer, pubkey_md5);
+ else
+ failf(data,
+ "Denied establishing ssh session: md5 fingerprint not available");
state(conn, SSH_SESSION_FREE);
sshc->actualcode = CURLE_PEER_FAILED_VERIFICATION;
return sshc->actualcode;
--
1.7.1
From 1ab6c353635760e8e25bacc13ae0cab2f97f7338 Mon Sep 17 00:00:00 2001
From: Marc Hoersken <info@marc-hoersken.de>
Date: Fri, 14 Sep 2012 14:48:55 +0200
Subject: [PATCH 3/3] ssh.c: Fixed warning: implicit conversion from enumeration type
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
---
lib/ssh.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/lib/ssh.c b/lib/ssh.c
index 466566c..e8b7172 100644
--- a/lib/ssh.c
+++ b/lib/ssh.c
@@ -635,7 +635,7 @@ static CURLcode ssh_knownhost(struct connectdata *conn)
return result;
}
-static bool ssh_check_fingerprint(struct connectdata *conn)
+static CURLcode ssh_check_fingerprint(struct connectdata *conn)
{
struct ssh_conn *sshc = &conn->proto.sshc;
struct SessionHandle *data = conn->data;
@@ -736,7 +736,7 @@ static CURLcode ssh_statemach_act(struct connectdata *conn, bool *block)
* whatever) is up to us.
*/
result = ssh_check_fingerprint(conn);
- if(!result)
+ if(result == CURLE_OK)
state(conn, SSH_AUTHLIST);
break;
--
1.7.1

7
curl.spec
View File

@ -11,6 +11,9 @@ Source3: hide_selinux.c
# eliminate unnecessary inotify events on upload via file protocol (#844385)
Patch1: 0001-curl-7.27.0-1f8518c5.patch
# do not crash if MD5 fingerprint is not provided by libssh2
Patch2: 0002-curl-7.27.0-f05e5136.patch
# patch making libcurl multilib ready
Patch101: 0101-curl-7.27.0-multilib.patch
@ -105,6 +108,7 @@ documentation of the library, too.
# upstream patches
%patch1 -p1
%patch2 -p1
# Fedora patches
%patch101 -p1
@ -228,8 +232,9 @@ rm -rf $RPM_BUILD_ROOT
%{_datadir}/aclocal/libcurl.m4
%changelog
* Mon Aug 06 2012 Kamil Dudka <kdudka@redhat.com> 7.27.0-3
* Mon Oct 01 2012 Kamil Dudka <kdudka@redhat.com> 7.27.0-3
- use the upstream facility to disable problematic tests
- do not crash if MD5 fingerprint is not provided by libssh2
* Wed Aug 01 2012 Kamil Dudka <kdudka@redhat.com> 7.27.0-2
- eliminate unnecessary inotify events on upload via file protocol (#844385)