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git-commit-vandalism/t/t0300-credentials.sh
Jeff King 8ba8ed568e credential: refuse to operate when missing host or protocol 
The credential helper protocol was designed to be very flexible: the
fields it takes as input are treated as a pattern, and any missing
fields are taken as wildcards. This allows unusual things like:

  echo protocol=https | git credential reject

to delete all stored https credentials (assuming the helpers themselves
treat the input that way). But when helpers are invoked automatically by
Git, this flexibility works against us. If for whatever reason we don't
have a "host" field, then we'd match _any_ host. When you're filling a
credential to send to a remote server, this is almost certainly not what
you want.

Prevent this at the layer that writes to the credential helper. Add a
check to the credential API that the host and protocol are always passed
in, and add an assertion to the credential_write function that speaks
credential helper protocol to be doubly sure.

There are a few ways this can be triggered in practice:

  - the "git credential" command passes along arbitrary credential
    parameters it reads from stdin.

  - until the previous patch, when the host field of a URL is empty, we
    would leave it unset (rather than setting it to the empty string)

  - a URL like "example.com/foo.git" is treated by curl as if "http://"
    was present, but our parser sees it as a non-URL and leaves all
    fields unset

  - the recent fix for URLs with embedded newlines blanks the URL but
    otherwise continues. Rather than having the desired effect of
    looking up no credential at all, many helpers will return _any_
    credential

Our earlier test for an embedded newline didn't catch this because it
only checked that the credential was cleared, but didn't configure an
actual helper. Configuring the "verbatim" helper in the test would show
that it is invoked (it's obviously a silly helper which doesn't look at
its input, but the point is that it shouldn't be run at all). Since
we're switching this case to die(), we don't need to bother with a
helper. We can see the new behavior just by checking that the operation
fails.

We'll add new tests covering partial input as well (these can be
triggered through various means with url-parsing, but it's simpler to
just check them directly, as we know we are covered even if the url
parser changes behavior in the future).

[jn: changed to die() instead of logging and showing a manual
 username/password prompt]

Reported-by: Carlo Arenas <carenas@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>
2020-04-19 16:10:58 -07:00

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#!/bin/sh
test_description='basic credential helper tests'
. ./test-lib.sh
. "$TEST_DIRECTORY"/lib-credential.sh
test_expect_success 'setup helper scripts' '
cat >dump <<-\EOF &&
whoami=$(echo $0 | sed s/.*git-credential-//)
echo >&2 "$whoami: $*"
OIFS=$IFS
IFS==
while read key value; do
echo >&2 "$whoami: $key=$value"
eval "$key=$value"
done
IFS=$OIFS
EOF
write_script git-credential-useless <<-\EOF &&
. ./dump
exit 0
EOF
write_script git-credential-quit <<-\EOF &&
. ./dump
echo quit=1
EOF
write_script git-credential-verbatim <<-\EOF &&
user=$1; shift
pass=$1; shift
. ./dump
test -z "$user" || echo username=$user
test -z "$pass" || echo password=$pass
EOF
PATH="$PWD:$PATH"
'
test_expect_success 'credential_fill invokes helper' '
check fill "verbatim foo bar" <<-\EOF
protocol=http
host=example.com
--
protocol=http
host=example.com
username=foo
password=bar
--
verbatim: get
verbatim: protocol=http
verbatim: host=example.com
EOF
'
test_expect_success 'credential_fill invokes multiple helpers' '
check fill useless "verbatim foo bar" <<-\EOF
protocol=http
host=example.com
--
protocol=http
host=example.com
username=foo
password=bar
--
useless: get
useless: protocol=http
useless: host=example.com
verbatim: get
verbatim: protocol=http
verbatim: host=example.com
EOF
'
test_expect_success 'credential_fill stops when we get a full response' '
check fill "verbatim one two" "verbatim three four" <<-\EOF
protocol=http
host=example.com
--
protocol=http
host=example.com
username=one
password=two
--
verbatim: get
verbatim: protocol=http
verbatim: host=example.com
EOF
'
test_expect_success 'credential_fill continues through partial response' '
check fill "verbatim one \"\"" "verbatim two three" <<-\EOF
protocol=http
host=example.com
--
protocol=http
host=example.com
username=two
password=three
--
verbatim: get
verbatim: protocol=http
verbatim: host=example.com
verbatim: get
verbatim: protocol=http
verbatim: host=example.com
verbatim: username=one
EOF
'
test_expect_success 'credential_fill passes along metadata' '
check fill "verbatim one two" <<-\EOF
protocol=ftp
host=example.com
path=foo.git
--
protocol=ftp
host=example.com
path=foo.git
username=one
password=two
--
verbatim: get
verbatim: protocol=ftp
verbatim: host=example.com
verbatim: path=foo.git
EOF
'
test_expect_success 'credential_approve calls all helpers' '
check approve useless "verbatim one two" <<-\EOF
protocol=http
host=example.com
username=foo
password=bar
--
--
useless: store
useless: protocol=http
useless: host=example.com
useless: username=foo
useless: password=bar
verbatim: store
verbatim: protocol=http
verbatim: host=example.com
verbatim: username=foo
verbatim: password=bar
EOF
'
test_expect_success 'do not bother storing password-less credential' '
check approve useless <<-\EOF
protocol=http
host=example.com
username=foo
--
--
EOF
'
test_expect_success 'credential_reject calls all helpers' '
check reject useless "verbatim one two" <<-\EOF
protocol=http
host=example.com
username=foo
password=bar
--
--
useless: erase
useless: protocol=http
useless: host=example.com
useless: username=foo
useless: password=bar
verbatim: erase
verbatim: protocol=http
verbatim: host=example.com
verbatim: username=foo
verbatim: password=bar
EOF
'
test_expect_success 'usernames can be preserved' '
check fill "verbatim \"\" three" <<-\EOF
protocol=http
host=example.com
username=one
--
protocol=http
host=example.com
username=one
password=three
--
verbatim: get
verbatim: protocol=http
verbatim: host=example.com
verbatim: username=one
EOF
'
test_expect_success 'usernames can be overridden' '
check fill "verbatim two three" <<-\EOF
protocol=http
host=example.com
username=one
--
protocol=http
host=example.com
username=two
password=three
--
verbatim: get
verbatim: protocol=http
verbatim: host=example.com
verbatim: username=one
EOF
'
test_expect_success 'do not bother completing already-full credential' '
check fill "verbatim three four" <<-\EOF
protocol=http
host=example.com
username=one
password=two
--
protocol=http
host=example.com
username=one
password=two
--
EOF
'
# We can't test the basic terminal password prompt here because
# getpass() tries too hard to find the real terminal. But if our
# askpass helper is run, we know the internal getpass is working.
test_expect_success 'empty helper list falls back to internal getpass' '
check fill <<-\EOF
protocol=http
host=example.com
--
protocol=http
host=example.com
username=askpass-username
password=askpass-password
--
askpass: Username for '\''http://example.com'\'':
askpass: Password for '\''http://askpass-username@example.com'\'':
EOF
'
test_expect_success 'internal getpass does not ask for known username' '
check fill <<-\EOF
protocol=http
host=example.com
username=foo
--
protocol=http
host=example.com
username=foo
password=askpass-password
--
askpass: Password for '\''http://foo@example.com'\'':
EOF
'
HELPER="!f() {
cat >/dev/null
echo username=foo
echo password=bar
}; f"
test_expect_success 'respect configured credentials' '
test_config credential.helper "$HELPER" &&
check fill <<-\EOF
protocol=http
host=example.com
--
protocol=http
host=example.com
username=foo
password=bar
--
EOF
'
test_expect_success 'match configured credential' '
test_config credential.https://example.com.helper "$HELPER" &&
check fill <<-\EOF
protocol=https
host=example.com
path=repo.git
--
protocol=https
host=example.com
username=foo
password=bar
--
EOF
'
test_expect_success 'do not match configured credential' '
test_config credential.https://foo.helper "$HELPER" &&
check fill <<-\EOF
protocol=https
host=bar
--
protocol=https
host=bar
username=askpass-username
password=askpass-password
--
askpass: Username for '\''https://bar'\'':
askpass: Password for '\''https://askpass-username@bar'\'':
EOF
'
test_expect_success 'pull username from config' '
test_config credential.https://example.com.username foo &&
check fill <<-\EOF
protocol=https
host=example.com
--
protocol=https
host=example.com
username=foo
password=askpass-password
--
askpass: Password for '\''https://foo@example.com'\'':
EOF
'
test_expect_success 'http paths can be part of context' '
check fill "verbatim foo bar" <<-\EOF &&
protocol=https
host=example.com
path=foo.git
--
protocol=https
host=example.com
username=foo
password=bar
--
verbatim: get
verbatim: protocol=https
verbatim: host=example.com
EOF
test_config credential.https://example.com.useHttpPath true &&
check fill "verbatim foo bar" <<-\EOF
protocol=https
host=example.com
path=foo.git
--
protocol=https
host=example.com
path=foo.git
username=foo
password=bar
--
verbatim: get
verbatim: protocol=https
verbatim: host=example.com
verbatim: path=foo.git
EOF
'
test_expect_success 'helpers can abort the process' '
test_must_fail git \
-c credential.helper=quit \
-c credential.helper="verbatim foo bar" \
credential fill >stdout 2>stderr <<-\EOF &&
protocol=http
host=example.com
EOF
>expect &&
test_cmp expect stdout &&
cat >expect <<-\EOF &&
quit: get
quit: protocol=http
quit: host=example.com
fatal: credential helper '\''quit'\'' told us to quit
EOF
test_i18ncmp expect stderr
'
test_expect_success 'empty helper spec resets helper list' '
test_config credential.helper "verbatim file file" &&
check fill "" "verbatim cmdline cmdline" <<-\EOF
protocol=http
host=example.com
--
protocol=http
host=example.com
username=cmdline
password=cmdline
--
verbatim: get
verbatim: protocol=http
verbatim: host=example.com
EOF
'
test_expect_success 'url parser rejects embedded newlines' '
test_must_fail git credential fill 2>stderr <<-\EOF &&
url=https://one.example.com?%0ahost=two.example.com/
EOF
cat >expect <<-\EOF &&
warning: url contains a newline in its host component: https://one.example.com?%0ahost=two.example.com/
warning: skipping credential lookup for url: https://one.example.com?%0ahost=two.example.com/
fatal: refusing to work with credential missing host field
EOF
test_i18ncmp expect stderr
'
test_expect_success 'host-less URLs are parsed as empty host' '
check fill "verbatim foo bar" <<-\EOF
url=cert:///path/to/cert.pem
--
protocol=cert
host=
path=path/to/cert.pem
username=foo
password=bar
--
verbatim: get
verbatim: protocol=cert
verbatim: host=
verbatim: path=path/to/cert.pem
EOF
'
test_expect_success 'credential system refuses to work with missing host' '
test_must_fail git credential fill 2>stderr <<-\EOF &&
protocol=http
EOF
cat >expect <<-\EOF &&
fatal: refusing to work with credential missing host field
EOF
test_i18ncmp expect stderr
'
test_expect_success 'credential system refuses to work with missing protocol' '
test_must_fail git credential fill 2>stderr <<-\EOF &&
host=example.com
EOF
cat >expect <<-\EOF &&
fatal: refusing to work with credential missing protocol field
EOF
test_i18ncmp expect stderr
'
test_done
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