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Bug 1084079 - sftp / symlink does not create relative links
Summary: sftp / symlink does not create relative links
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: openssh
Version: 7.0
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Petr Lautrbach
QA Contact: Stanislav Zidek
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2014-04-03 14:45 UTC by Petr Lautrbach
Modified: 2015-03-05 09:27 UTC (History)
2 users (show)

Fixed In Version: openssh-6.6.1p1-2.el7
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-03-05 09:27:47 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2015:0425 0 normal SHIPPED_LIVE Moderate: openssh security, bug fix and enhancement update 2015-03-05 14:26:20 UTC

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
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