index : cgit

#!/bin/sh

# Checks auth-file.lua and auth-inline.lua, the shipped auth filters, which
# differ only in where accounts live. The unit checks meet luaossl and
# luaposix with deterministic stand-ins from the harness, and once more the
# real libraries wherever they are installed, proving tampered and expired
# cookies turned away, header injection stripped, unsafe redirects refused
# and the login flows answering as documented. Through cgit itself an
# unedited copy protects nothing, with or without the modules. When the
# binary's own Lua lacks them a protected repository stays closed, and when
# it has them a login opens one. A unit run is one test of some two hundred
# checks, and the names of those that failed show only under -v.

test_description='Check the shipped auth extensions'
CGIT_TEST_NO_CREATE_REPOS=YesPlease
. ./setup.sh
. "$TEST_OUTPUT_DIRECTORY/extensions/lib.sh"

# The unit checks run once more against the real luaossl and luaposix
# wherever an interpreter has them and its crypt(3) checks a SHA-512 hash.
auth_hash=$(openssl passwd -6 -salt testsalt "open sesame" 2>/dev/null) ||
	auth_hash=

# With no standalone Lua the unit checks still count, as skipped.
test -z "$interpreters" || test_set_prereq STANDALONE_LUA

for lua in ${interpreters:-lua}
do
	for variant in inline file
	do
		test_expect_success STANDALONE_LUA "auth-$variant checks under $lua" '
			mkdir "unit-$lua-$variant" &&
			"$lua" "$EXT_TEST_DIRECTORY/test-auth.lua" \
				"$EXTENSIONS_DIRECTORY/auth-$variant.lua" $variant "$PWD/unit-$lua-$variant"
		'
	done

	auth_libs=AUTH_LIBS_$(echo "$lua" | tr a-z. A-Z_)
	if test -n "$auth_hash" &&
		"$lua" -e "
			require('openssl.hmac') require('openssl.rand') require('posix.sys.stat')
			assert(require('posix.unistd').crypt('open sesame', '$auth_hash') == '$auth_hash')
		" >/dev/null 2>&1
	then
		test_set_prereq $auth_libs
	fi
	for variant in inline file
	do
		test_expect_success "STANDALONE_LUA,$auth_libs" "auth-$variant checks against the real libraries under $lua" '
			mkdir "real-$lua-$variant" &&
			"$lua" "$EXT_TEST_DIRECTORY/test-auth.lua" \
				"$EXTENSIONS_DIRECTORY/auth-$variant.lua" $variant "$PWD/real-$lua-$variant" "$auth_hash"
		'
	done
done

# Both filters say a change to the code they share belongs in both, and the
# only difference allowed is where each defines trim.
test_expect_success 'the two auth filters share their code word for word' '
	sed -n "/^-- The url helpers below/,\$p" "$EXTENSIONS_DIRECTORY/auth-file.lua" >file-tail &&
	sed -n "/^-- The url helpers below/,\$p" "$EXTENSIONS_DIRECTORY/auth-inline.lua" >inline-whole &&
	sed "/^-- Lua patterns backtrack/,/^\$/d" inline-whole >inline-tail &&
	test_line_count -gt 300 file-tail &&
	test_cmp file-tail inline-tail &&
	sed -n "/^-- Lua patterns backtrack/,/^end\$/p" "$EXTENSIONS_DIRECTORY/auth-file.lua" >file-trim &&
	sed -n "/^-- Lua patterns backtrack/,/^end\$/p" "$EXTENSIONS_DIRECTORY/auth-inline.lua" >inline-trim &&
	test_line_count = 14 file-trim &&
	test_cmp file-trim inline-trim
'

test_expect_success 'create a repository with one commit' '
	test_create_repo repos/authy &&
	(
		cd repos/authy &&
		echo content >file &&
		git add file &&
		git commit -m "guarded commit"
	)
'

if test "$CGIT_HAS_LUA" -eq 1 &&
	! cgit_lua_probe "$PWD/repos/authy/.git" openssl.rand openssl.hmac posix.sys.stat posix.unistd
then
	test_set_prereq CGIT_LUA_NOAUTH
	say 'cgit lua lacks luaossl or luaposix, expecting protected pages refused'
elif test "$CGIT_HAS_LUA" -eq 1 && test -n "$auth_hash"
then
	# A login through cgit also needs the crypt(3) behind cgit's own Lua to
	# check the hash.
	cat >crypt-probe.lua <<-EOF
	function filter_open(...) end
	function filter_write(str) end
	function filter_close()
		if require("posix.unistd").crypt("open sesame", "$auth_hash") == "$auth_hash" then
			html("CRYPT_PROBE_YES")
		end
		return 0
	end
	EOF
	cgitrc_repo crypt-probe-rc authy "repo.commit-filter=lua:$PWD/crypt-probe.lua"
	if cgit_rc crypt-probe-rc "url=authy/commit/" | grep CRYPT_PROBE_YES >/dev/null
	then
		test_set_prereq CGIT_LUA_AUTH
	fi
fi

test_expect_success CGIT_LUA 'point cgit at the unedited auth filter' '
	cgitrc_repo cgitrc authy "auth-filter=lua:$EXTENSIONS_DIRECTORY/auth-inline.lua"
'

test_expect_success CGIT_LUA 'an unedited copy protects nothing' '
	cgit_url "authy/log/" >tmp &&
	grep ">guarded commit</a>" tmp
'

# The secret has to be one not made yet, or a host secret already readable
# would sign the form wherever luaposix alone is missing.
test_expect_success CGIT_LUA_NOAUTH 'without the modules a protected repository stays closed' '
	cat >protect.awk <<-\EOF &&
	/^local secret_filename = / { print "local secret_filename = \"" secret "\""; next }
	{ print }
	/^local protected_repos = [{]$/ { print "\t[\"authy\"] = { alice = true }," }
	EOF
	awk -v secret="$PWD/guarded-secret" -f protect.awk "$EXTENSIONS_DIRECTORY/auth-inline.lua" >guarded.lua &&
	grep "\"authy\"" guarded.lua &&
	grep "guarded-secret" guarded.lua &&
	cgitrc_repo guardedrc authy "auth-filter=lua:$PWD/guarded.lua" &&
	cgit_rc guardedrc "url=authy/log/" >tmp 2>err &&
	! grep "guarded commit" tmp &&
	grep "<p class=.login-error. role=.alert.>Logins are unavailable" tmp &&
	grep -E "^\[cgit\] .*module .(openssl\.rand|openssl\.hmac|posix\.sys\.stat|posix\.unistd). not found" err
'

# A login through cgit itself, from the form to the protected repository's
# pages, opened with the cookie it grants and closed again without it.
test_expect_success CGIT_LUA_AUTH 'a login through cgit opens a protected repository' '
	cat >grant.awk <<-EOF &&
	/^local secret_filename = / { print "local secret_filename = \"$PWD/login-secret\""; next }
	{ print }
	/^local protected_repos = [{]\$/ { print "\t[\"authy\"] = { alice = true }," }
	/^local users = [{]\$/ { print "\talice = \"$auth_hash\"," }
	EOF
	awk -f grant.awk "$EXTENSIONS_DIRECTORY/auth-inline.lua" >granted.lua &&
	grep "login-secret" granted.lua &&
	grep "testsalt" granted.lua &&
	grep "\"authy\"" granted.lua &&
	cgitrc_repo grantrc authy "auth-filter=lua:$PWD/granted.lua" &&
	(export HTTPS=on && cgit_ok grantrc "url=authy/log/") >form &&
	grep "<form class=.login." form &&
	! grep "guarded commit" form &&
	token=$(sed -n "s/.*value=.\(redirect|[^|]*|0|[0-9a-f]*|[0-9a-f]*\).*/\1/p" form) &&
	test -n "$token" &&
	body="username=alice&password=open+sesame&redirect=$(printf "%s\n" "$token" |
		sed "s/%/%25/g; s/+/%2B/g; s/|/%7C/g")" &&
	printf "%s" "$body" >post &&
	(
		export CGIT_CONFIG="$PWD/grantrc" QUERY_STRING=p=login REQUEST_METHOD=POST \
			HTTPS=on CONTENT_LENGTH=${#body} CONTENT_TYPE=application/x-www-form-urlencoded &&
		cgit <post >answer 2>err
	) &&
	test_must_be_empty err &&
	grep "^Status: 302" answer &&
	grep "^Location: /authy/log/\$" answer &&
	cookie=$(sed -n "s/^Set-Cookie: \(__Host-cgitauth=[^;]*\);.*/\1/p" answer) &&
	test -n "$cookie" &&
	(export HTTPS=on HTTP_COOKIE="$cookie" && cgit_ok grantrc "url=authy/log/") >tmp &&
	grep ">guarded commit</a>" tmp &&
	(export HTTPS=on && cgit_ok grantrc "url=authy/log/") >tmp &&
	grep "<form class=.login." tmp &&
	! grep "guarded commit" tmp
'

# The access lists are keyed by a repository's url, which repo.name and
# section-from-path can make differ from the name the index shows, so a
# filter handed the name would leave a protected repository public.
test_expect_success 'an auth filter is handed the repository url' '
	write_script seen.sh <<-\EOF &&
	test "$1" = authenticate-cookie && printf "%s\n" "$9" >seen
	exit 1
	EOF
	cgitrc_repo seenrc team/tools.git "auth-filter=exec:$PWD/seen.sh" \
		"repo.path=$PWD/repos/authy/.git" "repo.name=tools.git" &&
	echo team/tools.git >expect &&
	cgit_ok seenrc "url=team/tools.git/log/" >tmp &&
	grep ">guarded commit</a>" tmp &&
	test_cmp expect seen &&
	rm seen &&
	cgit_ok seenrc "r=team/tools.git&p=log" >tmp &&
	grep ">guarded commit</a>" tmp &&
	test_cmp expect seen &&
	mkdir -p scan/team &&
	git clone -q --bare repos/authy scan/team/tools.git &&
	cat >scanrc <<-EOF &&
	virtual-root=/
	cache-size=0
	auth-filter=exec:$PWD/seen.sh
	section-from-path=1
	scan-path=$PWD/scan
	EOF
	cgit_ok scanrc "" >tmp &&
	grep ">tools.git</a>" tmp &&
	rm seen &&
	cgit_ok scanrc "url=team/tools.git/log/" >tmp &&
	grep ">guarded commit</a>" tmp &&
	test_cmp expect seen
'

# A filter of the test's own turns every visitor away, which needs no Lua.
# Until a visitor is let in, the header of a protected repository shows the
# site's description in place of its own and no owner, even for a
# repository hidden from the index.
test_expect_success 'the login page keeps the repository to itself' '
	write_script deny.sh <<-\EOF &&
	test "$1" = body && echo "<p>sign in</p>"
	exit 0
	EOF
	cgitrc_repo denyrc authy "root-desc=the whole site" "auth-filter=exec:$PWD/deny.sh" \
		"repo.desc=the secret plan" "repo.owner=Mallory Owner" "repo.hide=1" &&
	cgit_rc denyrc "url=authy/log/" >tmp &&
	grep "<p>sign in</p>" tmp &&
	grep "<p class=.sub desc.>the whole site</p>" tmp &&
	grep "<meta name=.description. content=.the whole site.>" tmp &&
	! grep "secret plan" tmp &&
	! grep "Mallory" tmp
'

# The login page answers in place of whatever page was asked for, so it is
# kept out of a search index, whatever the site allows for its own pages.
test_expect_success 'the login page asks not to be indexed' '
	cgit_rc denyrc "url=authy/log/" >tmp &&
	grep "^Status: 200" tmp &&
	grep "<meta name=.robots. content=.noindex, nofollow.>" tmp &&
	{
		echo "robots=" &&
		cat denyrc
	} >norobotsrc &&
	cgit_rc norobotsrc "url=authy/log/" >tmp &&
	grep "<meta name=.robots. content=.noindex, nofollow.>" tmp
'

test_done