[PATCH 4/6] daemon: handle NULs in extended attribute string
- From
Jeff King <peff@peff.net>
- Date
- Jan 25, 2018, 00:56 UTC
- Message-ID
- <20180125005619.GD26850@sigill.intra.peff.net>
- In-Reply-To
- <20180125005447.GA26661@sigill.intra.peff.net>
If we receive a request with extended attributes after the NUL, we try to write those attributes to the log. We do so with a "%s" format specifier, which will only show characters up to the first NUL.
That's enough for printing a "host=" specifier. But since dfe422d04d (daemon: recognize hidden request arguments, 2017-10-16) we may have another NUL, followed by protocol parameters, and those are not logged at all.
Let's cut out the attempt to show the whole string, and instead log when we parse individual attributes. We could leave the "extended attributes (%d bytes) exist" part of the log, which in theory could alert us to attributes that fail to parse. But anything we don't parse as a "host=" parameter gets blindly added to the "protocol" attribute, so we'd see it in that part of the log.
Signed-off-by: Jeff King <peff@peff.net> --- daemon.c | 9 ++++----- t/t5570-git-daemon.sh | 8 +++++--- 2 files changed, 9 insertions(+), 8 deletions(-)
diff --git a/daemon.c b/daemon.c index d78afc8e96..652f89b6e7 100644 --- a/daemon.c +++ b/daemon.c @@ -597,6 +597,7 @@ static char *parse_host_arg(struct hostinfo *hi, char *extra_args, int buflen) if (strncasecmp("host=", extra_args, 5) == 0) { val = extra_args + 5; vallen = strlen(val) + 1; + loginfo("Extended attribute \"host\": %s", val); if (*val) { /* Split <host>:<port> at colon. */ char *host; @@ -647,9 +648,11 @@ static void parse_extra_args(struct hostinfo *hi, struct argv_array *env, } } - if (git_protocol.len > 0) + if (git_protocol.len > 0) { + loginfo("Extended attribute \"protocol\": %s", git_protocol.buf); argv_array_pushf(env, GIT_PROTOCOL_ENVIRONMENT "=%s", git_protocol.buf); + } strbuf_release(&git_protocol); } @@ -757,10 +760,6 @@ static int execute(void) alarm(0); len = strlen(line); - if (pktlen != len) - loginfo("Extended attributes (%d bytes) exist <%.*s>", - (int) pktlen - len - 1, - (int) pktlen - len - 1, line + len + 1); if (len && line[len-1] == '\n') { line[--len] = 0; pktlen--; diff --git a/t/t5570-git-daemon.sh b/t/t5570-git-daemon.sh index 359af3994a..b556469db6 100755 --- a/t/t5570-git-daemon.sh +++ b/t/t5570-git-daemon.sh @@ -183,13 +183,15 @@ test_expect_success 'hostname cannot break out of directory' ' git ls-remote "$GIT_DAEMON_URL/escape.git" ' -test_expect_success 'daemon log records hostnames' ' +test_expect_success 'daemon log records all attributes' ' cat >expect <<-\EOF && - Extended attributes (15 bytes) exist <host=localhost> + Extended attribute "host": localhost + Extended attribute "protocol": version=1 EOF >daemon.log && GIT_OVERRIDE_VIRTUAL_HOST=localhost \ - git ls-remote "$GIT_DAEMON_URL/interp.git" && + git -c protocol.version=1 \ + ls-remote "$GIT_DAEMON_URL/interp.git" && grep -i extended.attribute daemon.log | cut -d" " -f2- >actual && test_cmp expect actual '
-- 2.16.1.273.gfdaa03aa74