notmuch/test/T357-index-decryption.sh
Daniel Kahn Gillmor bc396c967c test: signature verification during decryption (session keys)
When the user knows the signer's key, we want "notmuch show" to be
able to verify the signature of an encrypted and signed message
regardless of whether we are using a stashed session key or not.

I wrote this test because I was surprised to see signature
verification failing when viewing some encrypted messages after
upgrading to GPGME 1.13.0-1 in debian experimental.

The added tests here all pass with GPGME 1.12.0, but the final test
fails with 1.13.0, due to some buggy updates to GPGME upstream: see
https://dev.gnupg.org/T3464 for more details.

While the bug needs to be fixed in GPGME, notmuch's test suite needs
to make sure that GMime is doing what we expect it to do; i was a bit
surprised that it hadn't caught the problem, hence this patch.

I've fixed this bug in debian experimental with gpgme 1.13.0-2, so the
tests should pass on any debian system.  I've also fixed it in the
gpgme packages (1.13.0-2~ppa1) in the ubuntu xenial PPA
(ppa:notmuch/notmuch) that notmuch uses for Travis CI.

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
2019-06-08 20:14:00 -03:00

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#!/usr/bin/env bash
# TODO: test index.decryption=failed
test_description='indexing decrypted mail'
. $(dirname "$0")/test-lib.sh || exit 1
##################################################
add_gnupg_home
# create a test encrypted message
test_begin_subtest 'emacs delivery of encrypted message'
test_expect_success \
'emacs_fcc_message \
"test encrypted message for cleartext index 001" \
"This is a test encrypted message with a wumpus.\n" \
"(mml-secure-message-encrypt)"'
test_begin_subtest "search for unindexed cleartext"
output=$(notmuch search wumpus)
expected=''
test_expect_equal \
"$output" \
"$expected"
# create a test encrypted message that is indexed in the clear
test_begin_subtest 'emacs delivery of encrypted message'
test_expect_success \
'emacs_fcc_message --decrypt=true \
"test encrypted message for cleartext index 002" \
"This is a test encrypted message with a wumpus.\n" \
"(mml-secure-message-encrypt)"'
test_begin_subtest "emacs delivery of encrypted message, indexed cleartext"
output=$(notmuch search wumpus)
expected='thread:0000000000000002 2000-01-01 [1/1] Notmuch Test Suite; test encrypted message for cleartext index 002 (encrypted inbox)'
test_expect_equal \
"$output" \
"$expected"
# and the same search, but by property ($expected is untouched):
test_begin_subtest "emacs search by property for one message"
output=$(notmuch search property:index.decryption=success)
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "show the message body of the encrypted message"
notmuch dump wumpus
output=$(notmuch show wumpus | notmuch_show_part 3)
expected='This is a test encrypted message with a wumpus.'
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "message should go away after deletion"
# cache the message in an env var and remove it:
fname=$(notmuch search --output=files wumpus)
contents="$(notmuch show --format=raw wumpus)"
rm -f "$fname"
notmuch new
output=$(notmuch search wumpus)
expected=''
test_expect_equal \
"$output" \
"$expected"
# try reinserting it without decryption, should stay the same:
test_begin_subtest "message cleartext not present after insert"
notmuch insert --folder=sent <<<"$contents"
output=$(notmuch search wumpus)
test_expect_equal \
"$output" \
"$expected"
# show the message using stashing decryption
test_begin_subtest "stash decryption during show"
output=$(notmuch show --decrypt=stash tag:encrypted subject:002 | notmuch_show_part 3)
expected='This is a test encrypted message with a wumpus.'
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "search should now find the contents"
output=$(notmuch search wumpus)
expected='thread:0000000000000003 2000-01-01 [1/1] Notmuch Test Suite; test encrypted message for cleartext index 002 (encrypted inbox unread)'
test_expect_equal \
"$output" \
"$expected"
# try reinserting it with decryption, should appear again, but now we
# have two copies of the message:
test_begin_subtest "message cleartext is present after reinserting with --decrypt=true"
notmuch insert --folder=sent --decrypt=true <<<"$contents"
output=$(notmuch search wumpus)
expected='thread:0000000000000003 2000-01-01 [1/1(2)] Notmuch Test Suite; test encrypted message for cleartext index 002 (encrypted inbox unread)'
test_expect_equal \
"$output" \
"$expected"
# remove all copies
test_begin_subtest "delete all copies of the message"
mid="$(notmuch search --output=messages wumpus)"
rm -f $(notmuch search --output=files wumpus)
notmuch new
output=$(notmuch search "id:$mid")
expected=''
test_expect_equal \
"$output" \
"$expected"
# try inserting it with decryption, should appear as a single copy
# (note: i think thread id skips 4 because of duplicate message-id
# insertion, above)
test_begin_subtest "message cleartext is present with insert --decrypt=true"
notmuch insert --folder=sent --decrypt=true <<<"$contents"
output=$(notmuch search wumpus)
expected='thread:0000000000000005 2000-01-01 [1/1] Notmuch Test Suite; test encrypted message for cleartext index 002 (encrypted inbox unread)'
test_expect_equal \
"$output" \
"$expected"
# add a tag to all messages to ensure that it stays after reindexing
test_begin_subtest 'tagging all messages'
test_expect_success 'notmuch tag +blarney "encrypted message"'
test_begin_subtest "verify that tags have not changed"
output=$(notmuch search tag:blarney)
expected='thread:0000000000000001 2000-01-01 [1/1] Notmuch Test Suite; test encrypted message for cleartext index 001 (blarney encrypted inbox)
thread:0000000000000005 2000-01-01 [1/1] Notmuch Test Suite; test encrypted message for cleartext index 002 (blarney encrypted inbox unread)'
test_expect_equal \
"$output" \
"$expected"
# see if first message shows up after reindexing with --decrypt=true (same $expected, untouched):
test_begin_subtest 'reindex old messages'
test_expect_success 'notmuch reindex --decrypt=true tag:encrypted and not property:index.decryption=success'
test_begin_subtest "reindexed encrypted message, including cleartext"
output=$(notmuch search wumpus)
test_expect_equal \
"$output" \
"$expected"
# and the same search, but by property ($expected is untouched):
test_begin_subtest "emacs search by property for both messages"
output=$(notmuch search property:index.decryption=success)
test_expect_equal \
"$output" \
"$expected"
# try a simple reindex
test_begin_subtest 'reindex in auto mode'
test_expect_success 'notmuch reindex tag:encrypted and property:index.decryption=success'
test_begin_subtest "reindexed encrypted messages, should not have changed"
output=$(notmuch search wumpus)
test_expect_equal \
"$output" \
"$expected"
# try to remove cleartext indexing
test_begin_subtest 'reindex without cleartext'
test_expect_success 'notmuch reindex --decrypt=false tag:encrypted and property:index.decryption=success'
test_begin_subtest "reindexed encrypted messages, without cleartext"
output=$(notmuch search wumpus)
expected=''
test_expect_equal \
"$output" \
"$expected"
# ensure no session keys are present:
test_begin_subtest 'reindex using only session keys'
test_expect_success 'notmuch reindex tag:encrypted and property:index.decryption=success'
test_begin_subtest "reindexed encrypted messages, decrypting only with session keys"
output=$(notmuch search wumpus)
expected=''
test_expect_equal \
"$output" \
"$expected"
# and the same search, but by property ($expected is untouched):
test_begin_subtest "emacs search by property with both messages unindexed"
output=$(notmuch search property:index.decryption=success)
test_expect_equal \
"$output" \
"$expected"
# ensure that the tags remain even when we are dropping the cleartext.
test_begin_subtest "verify that tags remain without cleartext"
output=$(notmuch search tag:blarney)
expected='thread:0000000000000001 2000-01-01 [1/1] Notmuch Test Suite; test encrypted message for cleartext index 001 (blarney encrypted inbox)
thread:0000000000000005 2000-01-01 [1/1] Notmuch Test Suite; test encrypted message for cleartext index 002 (blarney encrypted inbox unread)'
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "index cleartext without keeping session keys"
test_expect_success "notmuch reindex --decrypt=nostash tag:blarney"
test_begin_subtest "Ensure that the indexed terms are present"
output=$(notmuch search wumpus)
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "show one of the messages with --decrypt=true"
output=$(notmuch show --decrypt=true thread:0000000000000001 | notmuch_show_part 3)
expected='This is a test encrypted message with a wumpus.'
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "Ensure that we cannot show the message with --decrypt=auto"
output=$(notmuch show thread:0000000000000001 | notmuch_show_part 3)
expected='Non-text part: application/octet-stream'
test_expect_equal \
"$output" \
"$expected"
add_email_corpus crypto
test_begin_subtest "indexing message fails when secret key not available"
notmuch reindex --decrypt=true id:simple-encrypted@crypto.notmuchmail.org
output=$(notmuch dump | LC_ALL=C sort)
expected='#= simple-encrypted@crypto.notmuchmail.org index.decryption=failure
#notmuch-dump batch-tag:3 config,properties,tags
+encrypted +inbox +unread -- id:basic-encrypted@crypto.notmuchmail.org
+encrypted +inbox +unread -- id:encrypted-signed@crypto.notmuchmail.org
+encrypted +inbox +unread -- id:simple-encrypted@crypto.notmuchmail.org'
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "cannot find cleartext index"
output=$(notmuch search sekrit)
expected=''
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "cleartext index recovery on reindexing with stashed session keys"
notmuch restore <<EOF
#notmuch-dump batch-tag:3 config,properties,tags
#= simple-encrypted@crypto.notmuchmail.org session-key=9%3AFC09987F5F927CC0CC0EE80A96E4C5BBF4A499818FB591207705DFDDD6112CF9
EOF
notmuch reindex id:simple-encrypted@crypto.notmuchmail.org
output=$(notmuch search sekrit | notmuch_search_sanitize)
expected='thread:XXX 2016-12-22 [1/1] Daniel Kahn Gillmor; encrypted message (encrypted inbox unread)'
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "notmuch reply should show cleartext if session key is present"
output=$(notmuch reply id:simple-encrypted@crypto.notmuchmail.org | grep '^>')
expected='> This is a top sekrit message.'
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "notmuch show should show cleartext if session key is present"
output=$(notmuch show id:simple-encrypted@crypto.notmuchmail.org | notmuch_show_part 3)
expected='This is a top sekrit message.'
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "notmuch show should show nothing if decryption is explicitly disallowed"
output=$(notmuch show --decrypt=false id:simple-encrypted@crypto.notmuchmail.org | notmuch_show_part 3)
expected='Non-text part: application/octet-stream'
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "purging stashed session keys should lose access to the cleartext"
notmuch reindex --decrypt=false id:simple-encrypted@crypto.notmuchmail.org
output=$(notmuch search sekrit)
expected=''
test_expect_equal \
"$output" \
"$expected"
test_begin_subtest "and cleartext should be unrecoverable now that there are no stashed session keys"
notmuch dump
notmuch reindex --decrypt=true id:simple-encrypted@crypto.notmuchmail.org
output=$(notmuch search sekrit)
expected=''
test_expect_equal \
"$output" \
"$expected"
goodsig='good_sig:[0][0][0]["crypto"]["signed"]["status"][0]["status"]="good"'
nosig='no_sig:[0][0][0]["crypto"]!"signed"'
test_begin_subtest "verify signature without a session key stashed when --decrypt=true"
output=$(notmuch show --format=json --decrypt=true id:encrypted-signed@crypto.notmuchmail.org)
test_json_nodes <<<"$output" "$goodsig"
test_begin_subtest "do not verify sig without a session key stashed if --decrypt=auto"
output=$(notmuch show --format=json id:encrypted-signed@crypto.notmuchmail.org)
test_json_nodes <<<"$output" "$nosig"
test_begin_subtest "verify signature when --decrypt=stash"
output=$(notmuch show --format=json --decrypt=stash id:encrypted-signed@crypto.notmuchmail.org)
test_json_nodes <<<"$output" "$goodsig"
test_begin_subtest "verify signature with stashed session key"
output=$(notmuch show --format=json id:encrypted-signed@crypto.notmuchmail.org)
test_json_nodes <<<"$output" "$goodsig"
# TODO: test removal of a message from the message store between
# indexing and reindexing.
# TODO: insert the same message into the message store twice, index,
# remove one of them from the message store, and then reindex.
# reindexing should return a failure but the message should still be
# present? -- or what should the semantics be if you ask to reindex a
# message whose underlying files have been renamed or moved or
# removed?
test_done