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Bug 1084079

Summary: sftp / symlink does not create relative links
Product: Red Hat Enterprise Linux 7 Reporter: Petr Lautrbach <plautrba>
Component: opensshAssignee: Petr Lautrbach <plautrba>
Status: CLOSED ERRATA QA Contact: Stanislav Zidek <szidek>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.0CC: pvrabec, szidek
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: openssh-6.6.1p1-2.el7 Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2015-03-05 09:27:47 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Petr Lautrbach 2014-04-03 14:45:38 UTC 
+++ This bug was initially created as a clone of Bug #1080154 +++

Description of problem:
while being connected via sftp - the usage of symlink will always
create a link with a absolute path. this leads to invalid links
when using chrooted sftp connections. 



Version-Release number of selected component (if applicable):
rpm -q openssh
openssh-5.3p1-94.el6.x86_64



How reproducible:
create chroot config like
tail -16  /etc/ssh/sshd_config
# override default of no subsystems
#Subsystem	sftp	/usr/libexec/openssh/sftp-server

# Example of overriding settings on a per-user basis
#Match User anoncvs
#	X11Forwarding no
#	AllowTcpForwarding no
#	ForceCommand cvs server

Subsystem	sftp	internal-sftp
Match Group myexamplegroup
  ForceCommand internal-sftp
  AllowTcpForwarding no
  ChrootDirectory /myexampleroot/service/
  X11Forwarding no

---
login via sftp (with an user in group myexamplegroup)
and do something like this in a subdirectory:

symlink ../example/ test

the result is only valid while being in the sftp session.

outside the chroot the link points to 

test -> /myexampleroot/service/subdir/../example/

which is not valid




Expected results:
relative links

--- Additional comment from RHEL Product and Program Management on 2014-03-24 20:23:26 CET ---

Since this bug report was entered in bugzilla, the release flag has been
set to ? to ensure that it is properly evaluated for this release.
Comment 1 Petr Lautrbach 2014-04-03 14:46:17 UTC 
diff --git a/sftp.c b/sftp.c
index 9c09a34..75d2e1f 100644
--- a/sftp.c
+++ b/sftp.c
@@ -1356,7 +1356,8 @@ parse_dispatch_command(struct sftp_conn *conn, const char *cmd, char **pwd,
        case I_SYMLINK:
                sflag = 1;
        case I_LINK:
-               path1 = make_absolute(path1, *pwd);
+               if (!sflag)
+                       path1 = make_absolute(path1, *pwd);
                path2 = make_absolute(path2, *pwd);
                err = (sflag ? do_symlink : do_hardlink)(conn, path1, path2);
                break;
Comment 7 errata-xmlrpc 2015-03-05 09:27:47 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-0425.html