add functional tests for --ca-roots flag

Signed-off-by: Dmitry S <dsavints@gmail.com>

.github/workflows/e2e-tests.yml

@@ -87,3 +87,7 @@ jobs:
       - name: Run pkcs11 end-to-end tests
         shell: bash
         run: ./test/e2e_test_pkcs11.sh
+
+      - name: Run e2e_tsa_certbundle.sh
+        shell: bash
+        run: make && PATH="$PWD:$PATH" ./test/e2e_tsa_certbundle.sh

test/e2e_tsa_certbundle.sh

@@ -0,0 +1,111 @@
+#!/usr/bin/env bash
+#
+# Copyright 2024 The Sigstore Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This test was done for https://github.com/sigstore/cosign/pull/3464
+# to verify that 'cosign verify' can work with the '--ca-roots'
+# command-line option. It is a modified copy of e2e_tsa_mtls.sh.
+
+set -exuo pipefail
+
+## Requirements
+# - cosign
+# - crane
+# - go
+
+CERT_BASE="test/testdata"
+
+# the certificates listed below are generated with the `gen-tsa-mtls-certs.sh` script.
+TIMESTAMP_CACERT=$CERT_BASE/tsa-mtls-ca.crt
+TIMESTAMP_CLIENT_CERT=$CERT_BASE/tsa-mtls-client.crt
+TIMESTAMP_CLIENT_KEY=$CERT_BASE/tsa-mtls-client.key
+TIMESTAMP_SERVER_CERT=$CERT_BASE/tsa-mtls-server.crt
+TIMESTAMP_SERVER_KEY=$CERT_BASE/tsa-mtls-server.key
+TIMESTAMP_SERVER_NAME="server.example.com"
+TIMESTAMP_SERVER_URL=https://localhost:3000/api/v1/timestamp
+TIMESTAMP_CHAIN_FILE="timestamp-chain"
+
+set +e
+COSIGN_CLI=./cosign
+command -v timestamp-server >& /dev/null
+exit_code=$?
+set -e
+if [[ $exit_code != 0 ]]; then
+	rm -fr /tmp/timestamp-authority
+	git clone https://github.com/sigstore/timestamp-authority /tmp/timestamp-authority
+	pushd /tmp/timestamp-authority
+	make
+	export PATH="/tmp/timestamp-authority/bin:$PATH"
+	popd
+fi
+
+timestamp-server serve --disable-ntp-monitoring --tls-host 0.0.0.0 --tls-port 3000 \
+		--scheme https --tls-ca $TIMESTAMP_CACERT --tls-key $TIMESTAMP_SERVER_KEY \
+		--tls-certificate $TIMESTAMP_SERVER_CERT &
+
+sleep 1
+curl -k -s --key test/testdata/tsa-mtls-client.key \
+    --cert test/testdata/tsa-mtls-client.crt \
+    --cacert test/testdata/tsa-mtls-ca.crt https://localhost:3000/api/v1/timestamp/certchain \
+    > $TIMESTAMP_CHAIN_FILE
+echo "DONE: $(ls -l $TIMESTAMP_CHAIN_FILE)"
+
+# unlike e2e_tsa_mtls.sh, there is no option to pass an image as a command-line parameter.
+
+# Upload an image to ttl.sh - commands from https://docs.sigstore.dev/cosign/keyless/
+SRC_IMAGE=busybox
+SRC_DIGEST=$(crane digest busybox)
+for i in 01 02; do
+	IMAGE_URI_TEMP=ttl.sh/$(uuidgen | head -c 8 | tr 'A-Z' 'a-z')
+	crane cp $SRC_IMAGE@$SRC_DIGEST "${IMAGE_URI_TEMP}:3h"
+	declare "IMG${i}=${IMAGE_URI_TEMP}@${SRC_DIGEST}"
+done
+
+
+echo "IMG01: $IMG01, IMG02: $IMG02, TIMESTAMP_SERVER_URL: $TIMESTAMP_SERVER_URL"
+
+rm -f *.pem import-cosign.* key.pem
+
+# use gencert to generate two CAs (for testing certificate bundle feature),
+# keys and certificates
+echo "generate CAs, keys and certificates with gencert"
+
+passwd=$(uuidgen | head -c 32 | tr 'A-Z' 'a-z')
+rm -f *.pem import-cosign.*
+for i in 01 02; do
+	go run test/gencert/main.go && mv cacert.pem cacert${i}.pem && mv ca-key.pem ca-key${i}.pem && mv cert.pem cert${i}.pem && mv key.pem key${i}.pem
+	COSIGN_PASSWORD="$passwd" $COSIGN_CLI import-key-pair --key key${i}.pem --output-key-prefix import-cosign${i}
+	IMG="IMG${i}"
+	COSIGN_PASSWORD="$passwd" $COSIGN_CLI sign --timestamp-server-url "${TIMESTAMP_SERVER_URL}" \
+		--timestamp-client-cacert ${TIMESTAMP_CACERT} --timestamp-client-cert ${TIMESTAMP_CLIENT_CERT} \
+		--timestamp-client-key ${TIMESTAMP_CLIENT_KEY} --timestamp-server-name ${TIMESTAMP_SERVER_NAME}\
+		--upload=true --tlog-upload=false --key import-cosign${i}.key --certificate-chain cacert${i}.pem --cert cert${i}.pem "${!IMG}"
+	# key is now longer needed
+	rm -f key${i}.pem import-cosign${i}.*
+done
+# create a certificate bundle - concatenate both generated CA certificates
+cat cacert01.pem cacert02.pem > ca-roots.pem
+
+echo "cosign verify:"
+for i in 01 02; do
+	IMG="IMG${i}"
+	$COSIGN_CLI verify --insecure-ignore-tlog --insecure-ignore-sct --check-claims=true \
+		--certificate-identity-regexp 'xyz@nosuchprovider.com' --certificate-oidc-issuer-regexp '.*' \
+		--ca-roots ca-roots.pem --timestamp-certificate-chain $TIMESTAMP_CHAIN_FILE "${!IMG}"
+done
+
+# cleanup
+rm -fr ca-key*.pem ca-roots.pem cacert*.pem cert*.pem timestamp-chain /tmp/timestamp-authority
+pkill -f 'timestamp-server'