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-rwxr-xr-xgit-submodule.sh9
-rwxr-xr-xt/t5815-submodule-protos.sh43
2 files changed, 52 insertions, 0 deletions
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