Hi,
I got a report on the Cygwin mailing list in terms of deprecating the
privsep option. It seems one consequence is that you can't run sshd
under a non-privileged account for personal use anymore:
----- Forwarded message from Lionel Fourquaux -----
> * This release deprecates the sshd_config UsePrivilegeSeparation
> option, thereby making privilege separation mandatory.
This has (probably not wholly intended) consequences when running sshd in
single user (non root) mode:
$ /usr/sbin/sshd -D -f ~/.ssh/sshd_config
Privilege separation user sshd does not exist
The problem is not limited to Cygwin, but is unlikely to happen in a typical
Unix, since ssh is probably installed globally.
If Cygwin was installed without administrative privileges, creating a
dedicated sshd user would be impossible (and makes little sense if sshd runs
in single user mode, anyway). I guess it would be possible to add a fake
user account in /etc/passwd.
Since user sshd and chroot /var/empty are not used in single user mode, it
might be better to remove the check in this case:
=== cut after ===
diff --git a/sshd.c b/sshd.c
index 010a2c3..4f9b2c8 100644
--- a/sshd.c
+++ b/sshd.c
@@ -1641,7 +1641,8 @@ main(int ac, char **av)
/* Store privilege separation user for later use if required. */
if ((privsep_pw = getpwnam(SSH_PRIVSEP_USER)) == NULL) {
- if (use_privsep || options.kerberos_authentication)
+ if ((use_privsep || options.kerberos_authentication)
+ && (getuid() == 0 || geteuid() == 0))
fatal("Privilege separation user %s does not exist",
SSH_PRIVSEP_USER);
} else {
@@ -1767,7 +1768,7 @@ main(int ac, char **av)
key_type(key));
}
- if (use_privsep) {
+ if (use_privsep && (getuid() == 0 || geteuid() == 0)) {
struct stat st;
if ((stat(_PATH_PRIVSEP_CHROOT_DIR, &st) == -1) ||
=== cut before ===
Best regards,
-- Lionel
----- End forwarded message -----
Is there a chance this could be reenabled again?
Thanks,
Corinna
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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