--- /dev/null
+From a5adaced2e13c135d5d9cc65be9eb95aa3bacedf Mon Sep 17 00:00:00 2001
+From: Jeff King <peff@peff.net>
+Date: Wed, 16 Sep 2015 13:12:52 -0400
+Subject: [PATCH] transport: add a protocol-whitelist environment variable
+
+If we are cloning an untrusted remote repository into a
+sandbox, we may also want to fetch remote submodules in
+order to get the complete view as intended by the other
+side. However, that opens us up to attacks where a malicious
+user gets us to clone something they would not otherwise
+have access to (this is not necessarily a problem by itself,
+but we may then act on the cloned contents in a way that
+exposes them to the attacker).
+
+Ideally such a setup would sandbox git entirely away from
+high-value items, but this is not always practical or easy
+to set up (e.g., OS network controls may block multiple
+protocols, and we would want to enable some but not others).
+
+We can help this case by providing a way to restrict
+particular protocols. We use a whitelist in the environment.
+This is more annoying to set up than a blacklist, but
+defaults to safety if the set of protocols git supports
+grows). If no whitelist is specified, we continue to default
+to allowing all protocols (this is an "unsafe" default, but
+since the minority of users will want this sandboxing
+effect, it is the only sensible one).
+
+A note on the tests: ideally these would all be in a single
+test file, but the git-daemon and httpd test infrastructure
+is an all-or-nothing proposition rather than a test-by-test
+prerequisite. By putting them all together, we would be
+unable to test the file-local code on machines without
+apache.
+
+Signed-off-by: Jeff King <peff@peff.net>
+Signed-off-by: Junio C Hamano <gitster@pobox.com>
+
+Upstream-Status: Backport
+
+http://archive.ubuntu.com/ubuntu/pool/main/g/git/git_2.5.0-1ubuntu0.1.debian.tar.xz
+
+CVE: CVE-2015-7545 #1
+Singed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ Documentation/git.txt | 32 ++++++++++++++
+ connect.c | 5 +++
+ t/lib-proto-disable.sh | 96 ++++++++++++++++++++++++++++++++++++++++++
+ t/t5810-proto-disable-local.sh | 14 ++++++
+ t/t5811-proto-disable-git.sh | 20 +++++++++
+ t/t5812-proto-disable-http.sh | 20 +++++++++
+ t/t5813-proto-disable-ssh.sh | 20 +++++++++
+ t/t5814-proto-disable-ext.sh | 18 ++++++++
+ transport-helper.c | 2 +
+ transport.c | 21 ++++++++-
+ transport.h | 7 +++
+ 11 files changed, 254 insertions(+), 1 deletion(-)
+ create mode 100644 t/lib-proto-disable.sh
+ create mode 100755 t/t5810-proto-disable-local.sh
+ create mode 100755 t/t5811-proto-disable-git.sh
+ create mode 100755 t/t5812-proto-disable-http.sh
+ create mode 100755 t/t5813-proto-disable-ssh.sh
+ create mode 100755 t/t5814-proto-disable-ext.sh
+
+Index: git-2.5.0/Documentation/git.txt
+===================================================================
+--- git-2.5.0.orig/Documentation/git.txt 2015-12-11 12:46:48.975637719 -0500
++++ git-2.5.0/Documentation/git.txt 2015-12-11 12:46:48.967637661 -0500
+@@ -1069,6 +1069,38 @@
+ an operation has touched every ref (e.g., because you are
+ cloning a repository to make a backup).
+
++`GIT_ALLOW_PROTOCOL`::
++ If set, provide a colon-separated list of protocols which are
++ allowed to be used with fetch/push/clone. This is useful to
++ restrict recursive submodule initialization from an untrusted
++ repository. Any protocol not mentioned will be disallowed (i.e.,
++ this is a whitelist, not a blacklist). If the variable is not
++ set at all, all protocols are enabled. The protocol names
++ currently used by git are:
++
++ - `file`: any local file-based path (including `file://` URLs,
++ or local paths)
++
++ - `git`: the anonymous git protocol over a direct TCP
++ connection (or proxy, if configured)
++
++ - `ssh`: git over ssh (including `host:path` syntax,
++ `git+ssh://`, etc).
++
++ - `rsync`: git over rsync
++
++ - `http`: git over http, both "smart http" and "dumb http".
++ Note that this does _not_ include `https`; if you want both,
++ you should specify both as `http:https`.
++
++ - any external helpers are named by their protocol (e.g., use
++ `hg` to allow the `git-remote-hg` helper)
+++
++Note that this controls only git's internal protocol selection.
++If libcurl is used (e.g., by the `http` transport), it may
++redirect to other protocols. There is not currently any way to
++restrict this.
++
+
+ Discussion[[Discussion]]
+ ------------------------
+Index: git-2.5.0/connect.c
+===================================================================
+--- git-2.5.0.orig/connect.c 2015-12-11 12:46:48.975637719 -0500
++++ git-2.5.0/connect.c 2015-12-11 12:46:48.967637661 -0500
+@@ -9,6 +9,7 @@
+ #include "url.h"
+ #include "string-list.h"
+ #include "sha1-array.h"
++#include "transport.h"
+
+ static char *server_capabilities;
+ static const char *parse_feature_value(const char *, const char *, int *);
+@@ -694,6 +695,8 @@
+ else
+ target_host = xstrdup(hostandport);
+
++ transport_check_allowed("git");
++
+ /* These underlying connection commands die() if they
+ * cannot connect.
+ */
+@@ -727,6 +730,7 @@
+ int putty, tortoiseplink = 0;
+ char *ssh_host = hostandport;
+ const char *port = NULL;
++ transport_check_allowed("ssh");
+ get_host_and_port(&ssh_host, &port);
+
+ if (!port)
+@@ -781,6 +785,7 @@
+ /* remove repo-local variables from the environment */
+ conn->env = local_repo_env;
+ conn->use_shell = 1;
++ transport_check_allowed("file");
+ }
+ argv_array_push(&conn->args, cmd.buf);
+
+Index: git-2.5.0/t/lib-proto-disable.sh
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ git-2.5.0/t/lib-proto-disable.sh 2015-12-11 12:46:48.967637661 -0500
+@@ -0,0 +1,96 @@
++# Test routines for checking protocol disabling.
++
++# test cloning a particular protocol
++# $1 - description of the protocol
++# $2 - machine-readable name of the protocol
++# $3 - the URL to try cloning
++test_proto () {
++ desc=$1
++ proto=$2
++ url=$3
++
++ test_expect_success "clone $1 (enabled)" '
++ rm -rf tmp.git &&
++ (
++ GIT_ALLOW_PROTOCOL=$proto &&
++ export GIT_ALLOW_PROTOCOL &&
++ git clone --bare "$url" tmp.git
++ )
++ '
++
++ test_expect_success "fetch $1 (enabled)" '
++ (
++ cd tmp.git &&
++ GIT_ALLOW_PROTOCOL=$proto &&
++ export GIT_ALLOW_PROTOCOL &&
++ git fetch
++ )
++ '
++
++ test_expect_success "push $1 (enabled)" '
++ (
++ cd tmp.git &&
++ GIT_ALLOW_PROTOCOL=$proto &&
++ export GIT_ALLOW_PROTOCOL &&
++ git push origin HEAD:pushed
++ )
++ '
++
++ test_expect_success "push $1 (disabled)" '
++ (
++ cd tmp.git &&
++ GIT_ALLOW_PROTOCOL=none &&
++ export GIT_ALLOW_PROTOCOL &&
++ test_must_fail git push origin HEAD:pushed
++ )
++ '
++
++ test_expect_success "fetch $1 (disabled)" '
++ (
++ cd tmp.git &&
++ GIT_ALLOW_PROTOCOL=none &&
++ export GIT_ALLOW_PROTOCOL &&
++ test_must_fail git fetch
++ )
++ '
++
++ test_expect_success "clone $1 (disabled)" '
++ rm -rf tmp.git &&
++ (
++ GIT_ALLOW_PROTOCOL=none &&
++ export GIT_ALLOW_PROTOCOL &&
++ test_must_fail git clone --bare "$url" tmp.git
++ )
++ '
++}
++
++# set up an ssh wrapper that will access $host/$repo in the
++# trash directory, and enable it for subsequent tests.
++setup_ssh_wrapper () {
++ test_expect_success 'setup ssh wrapper' '
++ write_script ssh-wrapper <<-\EOF &&
++ echo >&2 "ssh: $*"
++ host=$1; shift
++ cd "$TRASH_DIRECTORY/$host" &&
++ eval "$*"
++ EOF
++ GIT_SSH="$PWD/ssh-wrapper" &&
++ export GIT_SSH &&
++ export TRASH_DIRECTORY
++ '
++}
++
++# set up a wrapper that can be used with remote-ext to
++# access repositories in the "remote" directory of trash-dir,
++# like "ext::fake-remote %S repo.git"
++setup_ext_wrapper () {
++ test_expect_success 'setup ext wrapper' '
++ write_script fake-remote <<-\EOF &&
++ echo >&2 "fake-remote: $*"
++ cd "$TRASH_DIRECTORY/remote" &&
++ eval "$*"
++ EOF
++ PATH=$TRASH_DIRECTORY:$PATH &&
++ export TRASH_DIRECTORY
++ '
++}
+Index: git-2.5.0/t/t5810-proto-disable-local.sh
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ git-2.5.0/t/t5810-proto-disable-local.sh 2015-12-11 12:46:48.967637661 -0500
+@@ -0,0 +1,14 @@
++#!/bin/sh
++
++test_description='test disabling of local paths in clone/fetch'
++. ./test-lib.sh
++. "$TEST_DIRECTORY/lib-proto-disable.sh"
++
++test_expect_success 'setup repository to clone' '
++ test_commit one
++'
++
++test_proto "file://" file "file://$PWD"
++test_proto "path" file .
++
++test_done
+Index: git-2.5.0/t/t5811-proto-disable-git.sh
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ git-2.5.0/t/t5811-proto-disable-git.sh 2015-12-11 12:46:48.967637661 -0500
+@@ -0,0 +1,20 @@
++#!/bin/sh
++
++test_description='test disabling of git-over-tcp in clone/fetch'
++. ./test-lib.sh
++. "$TEST_DIRECTORY/lib-proto-disable.sh"
++. "$TEST_DIRECTORY/lib-git-daemon.sh"
++start_git_daemon
++
++test_expect_success 'create git-accessible repo' '
++ bare="$GIT_DAEMON_DOCUMENT_ROOT_PATH/repo.git" &&
++ test_commit one &&
++ git --bare init "$bare" &&
++ git push "$bare" HEAD &&
++ >"$bare/git-daemon-export-ok" &&
++ git -C "$bare" config daemon.receivepack true
++'
++
++test_proto "git://" git "$GIT_DAEMON_URL/repo.git"
++
++test_done
+Index: git-2.5.0/t/t5812-proto-disable-http.sh
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ git-2.5.0/t/t5812-proto-disable-http.sh 2015-12-11 12:46:48.967637661 -0500
+@@ -0,0 +1,20 @@
++#!/bin/sh
++
++test_description='test disabling of git-over-http in clone/fetch'
++. ./test-lib.sh
++. "$TEST_DIRECTORY/lib-proto-disable.sh"
++. "$TEST_DIRECTORY/lib-httpd.sh"
++start_httpd
++
++test_expect_success 'create git-accessible repo' '
++ bare="$HTTPD_DOCUMENT_ROOT_PATH/repo.git" &&
++ test_commit one &&
++ git --bare init "$bare" &&
++ git push "$bare" HEAD &&
++ git -C "$bare" config http.receivepack true
++'
++
++test_proto "smart http" http "$HTTPD_URL/smart/repo.git"
++
++stop_httpd
++test_done
+Index: git-2.5.0/t/t5813-proto-disable-ssh.sh
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ git-2.5.0/t/t5813-proto-disable-ssh.sh 2015-12-11 12:46:48.967637661 -0500
+@@ -0,0 +1,20 @@
++#!/bin/sh
++
++test_description='test disabling of git-over-ssh in clone/fetch'
++. ./test-lib.sh
++. "$TEST_DIRECTORY/lib-proto-disable.sh"
++
++setup_ssh_wrapper
++
++test_expect_success 'setup repository to clone' '
++ test_commit one &&
++ mkdir remote &&
++ git init --bare remote/repo.git &&
++ git push remote/repo.git HEAD
++'
++
++test_proto "host:path" ssh "remote:repo.git"
++test_proto "ssh://" ssh "ssh://remote/$PWD/remote/repo.git"
++test_proto "git+ssh://" ssh "git+ssh://remote/$PWD/remote/repo.git"
++
++test_done
+Index: git-2.5.0/t/t5814-proto-disable-ext.sh
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ git-2.5.0/t/t5814-proto-disable-ext.sh 2015-12-11 12:46:48.967637661 -0500
+@@ -0,0 +1,18 @@
++#!/bin/sh
++
++test_description='test disabling of remote-helper paths in clone/fetch'
++. ./test-lib.sh
++. "$TEST_DIRECTORY/lib-proto-disable.sh"
++
++setup_ext_wrapper
++
++test_expect_success 'setup repository to clone' '
++ test_commit one &&
++ mkdir remote &&
++ git init --bare remote/repo.git &&
++ git push remote/repo.git HEAD
++'
++
++test_proto "remote-helper" ext "ext::fake-remote %S repo.git"
++
++test_done
+Index: git-2.5.0/transport-helper.c
+===================================================================
+--- git-2.5.0.orig/transport-helper.c 2015-12-11 12:46:48.975637719 -0500
++++ git-2.5.0/transport-helper.c 2015-12-11 12:46:48.967637661 -0500
+@@ -1039,6 +1039,8 @@
+ struct helper_data *data = xcalloc(1, sizeof(*data));
+ data->name = name;
+
++ transport_check_allowed(name);
++
+ if (getenv("GIT_TRANSPORT_HELPER_DEBUG"))
+ debug = 1;
+
+Index: git-2.5.0/transport.c
+===================================================================
+--- git-2.5.0.orig/transport.c 2015-12-11 12:46:48.975637719 -0500
++++ git-2.5.0/transport.c 2015-12-11 12:46:48.967637661 -0500
+@@ -912,6 +912,20 @@
+ return strchr(url, ':') - url;
+ }
+
++void transport_check_allowed(const char *type)
++{
++ struct string_list allowed = STRING_LIST_INIT_DUP;
++ const char *v = getenv("GIT_ALLOW_PROTOCOL");
++
++ if (!v)
++ return;
++
++ string_list_split(&allowed, v, ':', -1);
++ if (!unsorted_string_list_has_string(&allowed, type))
++ die("transport '%s' not allowed", type);
++ string_list_clear(&allowed, 0);
++}
++
+ struct transport *transport_get(struct remote *remote, const char *url)
+ {
+ const char *helper;
+@@ -943,12 +957,14 @@
+ if (helper) {
+ transport_helper_init(ret, helper);
+ } else if (starts_with(url, "rsync:")) {
++ transport_check_allowed("rsync");
+ ret->get_refs_list = get_refs_via_rsync;
+ ret->fetch = fetch_objs_via_rsync;
+ ret->push = rsync_transport_push;
+ ret->smart_options = NULL;
+ } else if (url_is_local_not_ssh(url) && is_file(url) && is_bundle(url, 1)) {
+ struct bundle_transport_data *data = xcalloc(1, sizeof(*data));
++ transport_check_allowed("file");
+ ret->data = data;
+ ret->get_refs_list = get_refs_from_bundle;
+ ret->fetch = fetch_refs_from_bundle;
+@@ -960,7 +976,10 @@
+ || starts_with(url, "ssh://")
+ || starts_with(url, "git+ssh://")
+ || starts_with(url, "ssh+git://")) {
+- /* These are builtin smart transports. */
++ /*
++ * These are builtin smart transports; "allowed" transports
++ * will be checked individually in git_connect.
++ */
+ struct git_transport_data *data = xcalloc(1, sizeof(*data));
+ ret->data = data;
+ ret->set_option = NULL;
+Index: git-2.5.0/transport.h
+===================================================================
+--- git-2.5.0.orig/transport.h 2015-12-11 12:46:48.975637719 -0500
++++ git-2.5.0/transport.h 2015-12-11 12:46:48.971637690 -0500
+@@ -133,6 +133,13 @@
+ /* Returns a transport suitable for the url */
+ struct transport *transport_get(struct remote *, const char *);
+
++/*
++ * Check whether a transport is allowed by the environment,
++ * and die otherwise. type should generally be the URL scheme,
++ * as described in Documentation/git.txt
++ */
++void transport_check_allowed(const char *type);
++
+ /* Transport options which apply to git:// and scp-style URLs */
+
+ /* The program to use on the remote side to send a pack */
--- /dev/null
+From 33cfccbbf35a56e190b79bdec5c85457c952a021 Mon Sep 17 00:00:00 2001
+From: Jeff King <peff@peff.net>
+Date: Wed, 16 Sep 2015 13:13:12 -0400
+Subject: [PATCH] submodule: allow only certain protocols for submodule fetches
+
+Some protocols (like git-remote-ext) can execute arbitrary
+code found in the URL. The URLs that submodules use may come
+from arbitrary sources (e.g., .gitmodules files in a remote
+repository). Let's restrict submodules to fetching from a
+known-good subset of protocols.
+
+Note that we apply this restriction to all submodule
+commands, whether the URL comes from .gitmodules or not.
+This is more restrictive than we need to be; for example, in
+the tests we run:
+
+ git submodule add ext::...
+
+which should be trusted, as the URL comes directly from the
+command line provided by the user. But doing it this way is
+simpler, and makes it much less likely that we would miss a
+case. And since such protocols should be an exception
+(especially because nobody who clones from them will be able
+to update the submodules!), it's not likely to inconvenience
+anyone in practice.
+
+Reported-by: Blake Burkhart <bburky@bburky.com>
+Signed-off-by: Jeff King <peff@peff.net>
+Signed-off-by: Junio C Hamano <gitster@pobox.com>
+
+Upstream-Status: Backport
+
+http://archive.ubuntu.com/ubuntu/pool/main/g/git/git_2.5.0-1ubuntu0.1.debian.tar.xz
+
+CVE: CVE-2015-7545 #2
+Singed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ git-submodule.sh | 9 +++++++++
+ t/t5815-submodule-protos.sh | 43 +++++++++++++++++++++++++++++++++++++++++++
+ 2 files changed, 52 insertions(+)
+ create mode 100755 t/t5815-submodule-protos.sh
+
+diff --git a/git-submodule.sh b/git-submodule.sh
+index 36797c3..78c2740 100755
+--- a/git-submodule.sh
++++ b/git-submodule.sh
+@@ -22,6 +22,15 @@ require_work_tree
+ wt_prefix=$(git rev-parse --show-prefix)
+ cd_to_toplevel
+
++# Restrict ourselves to a vanilla subset of protocols; the URLs
++# we get are under control of a remote repository, and we do not
++# want them kicking off arbitrary git-remote-* programs.
++#
++# If the user has already specified a set of allowed protocols,
++# we assume they know what they're doing and use that instead.
++: ${GIT_ALLOW_PROTOCOL=file:git:http:https:ssh}
++export GIT_ALLOW_PROTOCOL
++
+ command=
+ branch=
+ force=
+diff --git a/t/t5815-submodule-protos.sh b/t/t5815-submodule-protos.sh
+new file mode 100755
+index 0000000..06f55a1
+--- /dev/null
++++ b/t/t5815-submodule-protos.sh
+@@ -0,0 +1,43 @@
++#!/bin/sh
++
++test_description='test protocol whitelisting with submodules'
++. ./test-lib.sh
++. "$TEST_DIRECTORY"/lib-proto-disable.sh
++
++setup_ext_wrapper
++setup_ssh_wrapper
++
++test_expect_success 'setup repository with submodules' '
++ mkdir remote &&
++ git init remote/repo.git &&
++ (cd remote/repo.git && test_commit one) &&
++ # submodule-add should probably trust what we feed it on the cmdline,
++ # but its implementation is overly conservative.
++ GIT_ALLOW_PROTOCOL=ssh git submodule add remote:repo.git ssh-module &&
++ GIT_ALLOW_PROTOCOL=ext git submodule add "ext::fake-remote %S repo.git" ext-module &&
++ git commit -m "add submodules"
++'
++
++test_expect_success 'clone with recurse-submodules fails' '
++ test_must_fail git clone --recurse-submodules . dst
++'
++
++test_expect_success 'setup individual updates' '
++ rm -rf dst &&
++ git clone . dst &&
++ git -C dst submodule init
++'
++
++test_expect_success 'update of ssh allowed' '
++ git -C dst submodule update ssh-module
++'
++
++test_expect_success 'update of ext not allowed' '
++ test_must_fail git -C dst submodule update ext-module
++'
++
++test_expect_success 'user can override whitelist' '
++ GIT_ALLOW_PROTOCOL=ext git -C dst submodule update ext-module
++'
++
++test_done
--- /dev/null
+From 5088d3b38775f8ac12d7f77636775b16059b67ef Mon Sep 17 00:00:00 2001
+From: Jeff King <peff@peff.net>
+Date: Tue, 22 Sep 2015 18:03:49 -0400
+Subject: [PATCH] transport: refactor protocol whitelist code
+
+The current callers only want to die when their transport is
+prohibited. But future callers want to query the mechanism
+without dying.
+
+Let's break out a few query functions, and also save the
+results in a static list so we don't have to re-parse for
+each query.
+
+Based-on-a-patch-by: Blake Burkhart <bburky@bburky.com>
+Signed-off-by: Jeff King <peff@peff.net>
+Signed-off-by: Junio C Hamano <gitster@pobox.com>
+
+Upstream-Status: Backport
+
+http://archive.ubuntu.com/ubuntu/pool/main/g/git/git_2.5.0-1ubuntu0.1.debian.tar.xz
+
+CVE: CVE-2015-7545 #3
+Singed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ transport.c | 38 ++++++++++++++++++++++++++++++--------
+ transport.h | 15 +++++++++++++--
+ 2 files changed, 43 insertions(+), 10 deletions(-)
+
+Index: git-2.5.0/transport.c
+===================================================================
+--- git-2.5.0.orig/transport.c 2015-12-11 12:47:09.547784038 -0500
++++ git-2.5.0/transport.c 2015-12-11 12:47:09.543784009 -0500
+@@ -912,18 +912,40 @@
+ return strchr(url, ':') - url;
+ }
+
+-void transport_check_allowed(const char *type)
++static const struct string_list *protocol_whitelist(void)
+ {
+- struct string_list allowed = STRING_LIST_INIT_DUP;
+- const char *v = getenv("GIT_ALLOW_PROTOCOL");
++ static int enabled = -1;
++ static struct string_list allowed = STRING_LIST_INIT_DUP;
++
++ if (enabled < 0) {
++ const char *v = getenv("GIT_ALLOW_PROTOCOL");
++ if (v) {
++ string_list_split(&allowed, v, ':', -1);
++ string_list_sort(&allowed);
++ enabled = 1;
++ } else {
++ enabled = 0;
++ }
++ }
++
++ return enabled ? &allowed : NULL;
++}
+
+- if (!v)
+- return;
++int is_transport_allowed(const char *type)
++{
++ const struct string_list *allowed = protocol_whitelist();
++ return !allowed || string_list_has_string(allowed, type);
++}
+
+- string_list_split(&allowed, v, ':', -1);
+- if (!unsorted_string_list_has_string(&allowed, type))
++void transport_check_allowed(const char *type)
++{
++ if (!is_transport_allowed(type))
+ die("transport '%s' not allowed", type);
+- string_list_clear(&allowed, 0);
++}
++
++int transport_restrict_protocols(void)
++{
++ return !!protocol_whitelist();
+ }
+
+ struct transport *transport_get(struct remote *remote, const char *url)
+Index: git-2.5.0/transport.h
+===================================================================
+--- git-2.5.0.orig/transport.h 2015-12-11 12:47:09.547784038 -0500
++++ git-2.5.0/transport.h 2015-12-11 12:47:09.543784009 -0500
+@@ -134,12 +134,23 @@
+ struct transport *transport_get(struct remote *, const char *);
+
+ /*
++ * Check whether a transport is allowed by the environment. Type should
++ * generally be the URL scheme, as described in Documentation/git.txt
++ */
++int is_transport_allowed(const char *type);
++
++/*
+ * Check whether a transport is allowed by the environment,
+- * and die otherwise. type should generally be the URL scheme,
+- * as described in Documentation/git.txt
++ * and die otherwise.
+ */
+ void transport_check_allowed(const char *type);
+
++/*
++ * Returns true if the user has attempted to turn on protocol
++ * restrictions at all.
++ */
++int transport_restrict_protocols(void);
++
+ /* Transport options which apply to git:// and scp-style URLs */
+
+ /* The program to use on the remote side to send a pack */
--- /dev/null
+Backport of:
+
+From f4113cac0c88b4f36ee6f3abf3218034440a68e3 Mon Sep 17 00:00:00 2001
+From: Blake Burkhart <bburky@bburky.com>
+Date: Tue, 22 Sep 2015 18:06:04 -0400
+Subject: [PATCH] http: limit redirection to protocol-whitelist
+
+Previously, libcurl would follow redirection to any protocol
+it was compiled for support with. This is desirable to allow
+redirection from HTTP to HTTPS. However, it would even
+successfully allow redirection from HTTP to SFTP, a protocol
+that git does not otherwise support at all. Furthermore
+git's new protocol-whitelisting could be bypassed by
+following a redirect within the remote helper, as it was
+only enforced at transport selection time.
+
+This patch limits redirects within libcurl to HTTP, HTTPS,
+FTP and FTPS. If there is a protocol-whitelist present, this
+list is limited to those also allowed by the whitelist. As
+redirection happens from within libcurl, it is impossible
+for an HTTP redirect to a protocol implemented within
+another remote helper.
+
+When the curl version git was compiled with is too old to
+support restrictions on protocol redirection, we warn the
+user if GIT_ALLOW_PROTOCOL restrictions were requested. This
+is a little inaccurate, as even without that variable in the
+environment, we would still restrict SFTP, etc, and we do
+not warn in that case. But anything else means we would
+literally warn every time git accesses an http remote.
+
+This commit includes a test, but it is not as robust as we
+would hope. It redirects an http request to ftp, and checks
+that curl complained about the protocol, which means that we
+are relying on curl's specific error message to know what
+happened. Ideally we would redirect to a working ftp server
+and confirm that we can clone without protocol restrictions,
+and not with them. But we do not have a portable way of
+providing an ftp server, nor any other protocol that curl
+supports (https is the closest, but we would have to deal
+with certificates).
+
+[jk: added test and version warning]
+
+Signed-off-by: Jeff King <peff@peff.net>
+Signed-off-by: Junio C Hamano <gitster@pobox.com>
+
+Upstream-Status: Backport
+
+http://archive.ubuntu.com/ubuntu/pool/main/g/git/git_2.5.0-1ubuntu0.1.debian.tar.xz
+
+CVE: CVE-2015-7545 #4
+Singed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ Documentation/git.txt | 5 -----
+ http.c | 17 +++++++++++++++++
+ t/lib-httpd/apache.conf | 1 +
+ t/t5812-proto-disable-http.sh | 9 +++++++++
+ 4 files changed, 27 insertions(+), 5 deletions(-)
+
+Index: git-2.5.0/Documentation/git.txt
+===================================================================
+--- git-2.5.0.orig/Documentation/git.txt 2015-12-11 12:47:18.707849212 -0500
++++ git-2.5.0/Documentation/git.txt 2015-12-11 12:47:18.703849183 -0500
+@@ -1095,11 +1095,6 @@
+
+ - any external helpers are named by their protocol (e.g., use
+ `hg` to allow the `git-remote-hg` helper)
+-+
+-Note that this controls only git's internal protocol selection.
+-If libcurl is used (e.g., by the `http` transport), it may
+-redirect to other protocols. There is not currently any way to
+-restrict this.
+
+
+ Discussion[[Discussion]]
+Index: git-2.5.0/http.c
+===================================================================
+--- git-2.5.0.orig/http.c 2015-12-11 12:47:18.707849212 -0500
++++ git-2.5.0/http.c 2015-12-11 12:47:34.171959268 -0500
+@@ -8,6 +8,7 @@
+ #include "credential.h"
+ #include "version.h"
+ #include "pkt-line.h"
++#include "transport.h"
+ #include "gettext.h"
+
+ int active_requests;
+@@ -340,6 +341,7 @@
+ static CURL *get_curl_handle(void)
+ {
+ CURL *result = curl_easy_init();
++ long allowed_protocols = 0;
+
+ if (!result)
+ die("curl_easy_init failed");
+@@ -399,6 +401,21 @@
+ #elif LIBCURL_VERSION_NUM >= 0x071101
+ curl_easy_setopt(result, CURLOPT_POST301, 1);
+ #endif
++#if LIBCURL_VERSION_NUM >= 0x071304
++ if (is_transport_allowed("http"))
++ allowed_protocols |= CURLPROTO_HTTP;
++ if (is_transport_allowed("https"))
++ allowed_protocols |= CURLPROTO_HTTPS;
++ if (is_transport_allowed("ftp"))
++ allowed_protocols |= CURLPROTO_FTP;
++ if (is_transport_allowed("ftps"))
++ allowed_protocols |= CURLPROTO_FTPS;
++ curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
++#else
++ if (transport_restrict_protocols())
++ warning("protocol restrictions not applied to curl redirects because\n"
++ "your curl version is too old (>= 7.19.4)");
++#endif
+
+ if (getenv("GIT_CURL_VERBOSE"))
+ curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
+Index: git-2.5.0/t/lib-httpd/apache.conf
+===================================================================
+--- git-2.5.0.orig/t/lib-httpd/apache.conf 2015-12-11 12:47:18.707849212 -0500
++++ git-2.5.0/t/lib-httpd/apache.conf 2015-12-11 12:47:18.703849183 -0500
+@@ -119,6 +119,7 @@
+ RewriteRule ^/smart-redir-temp/(.*)$ /smart/$1 [R=302]
+ RewriteRule ^/smart-redir-auth/(.*)$ /auth/smart/$1 [R=301]
+ RewriteRule ^/smart-redir-limited/(.*)/info/refs$ /smart/$1/info/refs [R=301]
++RewriteRule ^/ftp-redir/(.*)$ ftp://localhost:1000/$1 [R=302]
+
+ <IfDefine SSL>
+ LoadModule ssl_module modules/mod_ssl.so
+Index: git-2.5.0/t/t5812-proto-disable-http.sh
+===================================================================
+--- git-2.5.0.orig/t/t5812-proto-disable-http.sh 2015-12-11 12:47:18.707849212 -0500
++++ git-2.5.0/t/t5812-proto-disable-http.sh 2015-12-11 12:47:18.703849183 -0500
+@@ -16,5 +16,14 @@
+
+ test_proto "smart http" http "$HTTPD_URL/smart/repo.git"
+
++test_expect_success 'curl redirects respect whitelist' '
++ test_must_fail env GIT_ALLOW_PROTOCOL=http:https \
++ git clone "$HTTPD_URL/ftp-redir/repo.git" 2>stderr &&
++ {
++ test_i18ngrep "ftp.*disabled" stderr ||
++ test_i18ngrep "your curl version is too old"
++ }
++'
++
+ stop_httpd
+ test_done
--- /dev/null
+From b258116462399b318c86165c61a5c7123043cfd4 Mon Sep 17 00:00:00 2001
+From: Blake Burkhart <bburky@bburky.com>
+Date: Tue, 22 Sep 2015 18:06:20 -0400
+Subject: [PATCH] http: limit redirection depth
+
+By default, libcurl will follow circular http redirects
+forever. Let's put a cap on this so that somebody who can
+trigger an automated fetch of an arbitrary repository (e.g.,
+for CI) cannot convince git to loop infinitely.
+
+The value chosen is 20, which is the same default that
+Firefox uses.
+
+Signed-off-by: Jeff King <peff@peff.net>
+Signed-off-by: Junio C Hamano <gitster@pobox.com>
+
+Upstream-Status: Backport
+
+http://archive.ubuntu.com/ubuntu/pool/main/g/git/git_2.5.0-1ubuntu0.1.debian.tar.xz
+
+CVE: CVE-2015-7545 #5
+Singed-off-by: Armin Kuster <akuster@mvista.com>
+
+---
+ http.c | 1 +
+ t/lib-httpd/apache.conf | 3 +++
+ t/t5812-proto-disable-http.sh | 4 ++++
+ 3 files changed, 8 insertions(+)
+
+Index: git-2.5.0/http.c
+===================================================================
+--- git-2.5.0.orig/http.c 2015-12-11 12:48:02.900163824 -0500
++++ git-2.5.0/http.c 2015-12-11 12:48:02.896163796 -0500
+@@ -396,6 +396,7 @@
+ }
+
+ curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
++ curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
+ #if LIBCURL_VERSION_NUM >= 0x071301
+ curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
+ #elif LIBCURL_VERSION_NUM >= 0x071101
+Index: git-2.5.0/t/lib-httpd/apache.conf
+===================================================================
+--- git-2.5.0.orig/t/lib-httpd/apache.conf 2015-12-11 12:48:02.900163824 -0500
++++ git-2.5.0/t/lib-httpd/apache.conf 2015-12-11 12:48:02.896163796 -0500
+@@ -121,6 +121,9 @@
+ RewriteRule ^/smart-redir-limited/(.*)/info/refs$ /smart/$1/info/refs [R=301]
+ RewriteRule ^/ftp-redir/(.*)$ ftp://localhost:1000/$1 [R=302]
+
++RewriteRule ^/loop-redir/x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-x-(.*) /$1 [R=302]
++RewriteRule ^/loop-redir/(.*)$ /loop-redir/x-$1 [R=302]
++
+ <IfDefine SSL>
+ LoadModule ssl_module modules/mod_ssl.so
+
+Index: git-2.5.0/t/t5812-proto-disable-http.sh
+===================================================================
+--- git-2.5.0.orig/t/t5812-proto-disable-http.sh 2015-12-11 12:48:02.900163824 -0500
++++ git-2.5.0/t/t5812-proto-disable-http.sh 2015-12-11 12:48:02.896163796 -0500
+@@ -25,5 +25,9 @@
+ }
+ '
+
++test_expect_success 'curl limits redirects' '
++ test_must_fail git clone "$HTTPD_URL/loop-redir/smart/repo.git"
++'
++
+ stop_httpd
+ test_done
SRC_URI[tarball.sha256sum] = "8fa13ba8434ff83d24f57f831d55dbb9046434c266641180a37744facfce72ac"
SRC_URI[manpages.md5sum] = "134b049e51420a336049aac21c88a75a"
SRC_URI[manpages.sha256sum] = "745e4e797fe5061e781c880d370b1beb480199127da5acaf4e376e0b09d4d685"
+
+SRC_URI += "\
+ file://0008-CVE-2015-7545-1.patch \
+ file://0009-CVE-2015-7545-2.patch \
+ file://0010-CVE-2015-7545-3.patch \
+ file://0011-CVE-2015-7545-4.patch \
+ file://0012-CVE-2015-7545-5.patch \
+ "
projects / thirdparty / openembedded / openembedded-core-contrib.git / commitdiff
