[Proftpd-user] mod_exec and useStdin

[Ben R. <ben...@gm...>]

Hello,

I use ProfTPD 1.3.4a on my Debian Wheezy (7 / stable) box.

I am trying to use mod-exec with useStdin option in a simple test configuration.

Here is my mod_exec configuration :
ExecEngine on
ExecBeforeCommand PASS /tmp/test.sh arg1 "%U"
Execlog /var/log/proftpd/exec.log
ExecOptions useStdin

test.sh :
#!/bin/bash
read -r
arg1=$REPLY
read -r
arg2=$REPLY
echo "$arg1 / $arg2" >> /tmp/test.log
exit 0

I then try to connect :
# ftp 127.0.0.1
Connected to 127.0.0.1.
220 ProFTPD 1.3.4a Server (Debian) [127.0.0.1]
Name (127.0.0.1:root): ftp
331 Password required for ftp
Password:
421 Service not available, remote server has closed connection
Login failed.
No control connection for command: No such file or directory
ftp> 

However, test.log contains expected values :
arg1 / ftp

/var/log/proftpd/exec.log :
preparing to execute '/tmp/test.sh' with uid 104 (euid 104), gid 65534 (egid 65534)
 + '/tmp/test.sh': argv[1] = arg1
 + '/tmp/test.sh': argv[2] = %U
wrote argument 0 (arg1) to stdin (5)
wrote argument 1 (ftp) to stdin (5)

Note that the following 2 expected lines are not present :
'/tmp/test.sh' terminated normally, with exit status 0
ExecBeforeCommand for /tmp/test.sh succeeded

/var/log/proftpd/proftpd.log :
(localhost.localdomain[127.0.0.1]): FTP session opened.
(localhost.localdomain[127.0.0.1]): ProFTPD terminating (signal 11)
(localhost.localdomain[127.0.0.1]): FTP session closed.

I tried to use the Perl script provided here to read from stdin :
http://www.castaglia.org/proftpd/modules/mod_exec.html
Same issue.

I tried to use last version of mod_exec.c file :
1.33 instead of 1.20, but reverting the two PR_ISSPACE modifications to compile correctly.
Same issue.

I tried to use ExecOnEvent core.chroot instead of ExecBeforeCommand PASS.
Same issue.

Am I missing something ?

Thank you very much !

Best regards,

Ben