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Merge pull request #97 from cyphar/newgidmap-secure-setgroups
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newgidmap: enforce setgroups=deny if self-mapping a group
2018-02-16 08:40:39 -06:00
6d8be68071
README: add Aleksa Sarai to author list
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Signed-off-by: Aleksa Sarai <asarai@suse.de >
2018-02-16 17:56:36 +11:00
fb28c99b8a
newgidmap: enforce setgroups=deny if self-mapping a group
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This is necessary to match the kernel-side policy of "self-mapping in a
user namespace is fine, but you cannot drop groups" -- a policy that was
created in order to stop user namespaces from allowing trivial privilege
escalation by dropping supplementary groups that were "blacklisted" from
certain paths.
This is the simplest fix for the underlying issue, and effectively makes
it so that unless a user has a valid mapping set in /etc/subgid (which
only administrators can modify) -- and they are currently trying to use
that mapping -- then /proc/$pid/setgroups will be set to deny. This
workaround is only partial, because ideally it should be possible to set
an "allow_setgroups" or "deny_setgroups" flag in /etc/subgid to allow
administrators to further restrict newgidmap(1).
We also don't write anything in the "allow" case because "allow" is the
default, and users may have already written "deny" even if they
technically are allowed to use setgroups. And we don't write anything if
the setgroups policy is already "deny".
Ref: https://bugs.launchpad.net/ubuntu/+source/shadow/+bug/1729357
Fixes: CVE-2018-7169
Reported-by: Craig Furman <craig.furman89@gmail.com >
Signed-off-by: Aleksa Sarai <asarai@suse.de >
2018-02-16 17:56:35 +11:00
c0f0c67864
Merge pull request #92 from IronicBadger/master
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Fixes mispelling of MAX_DAYS help text
2018-01-18 22:42:12 -06:00
e91b0f0517
Fixes mispelling of MAX_DAYS help text
2018-01-17 12:21:48 +00:00
3f1f999e2d
Merge pull request #90 from t8m/userdel-chroot
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Make userdel to work with -R.
2018-01-08 22:57:43 -06:00
c63bc6bfaa
Merge pull request #91 from kloeri/master
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Add note to passwd(1) that --maxdays -1 disables the setting.
2018-01-08 22:56:23 -06:00
a54907dce3
Add note to passwd(1) that --maxdays -1 disables the setting.
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This note already exists in chage(1).
2018-01-03 18:36:40 +01:00
2c57c399bf
Make userdel to work with -R.
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The userdel checks for users with getpwnam() which might not work
properly in chroot. Check for the user's presence in local files only.
2017-12-21 09:12:58 +01:00
056f7352ef
Merge pull request #86 from WheresAlice/master
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Make language more inclusive
2017-10-06 17:47:31 -05:00
0c2939b331
Merge pull request #82 from t8m/ingroup
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newgrp: avoid unnecessary group lookups
2017-10-06 17:45:31 -05:00
68e3d685fd
Merge pull request #84 from jubalh/mentionman
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Add note about conditional man pages
2017-10-06 17:43:47 -05:00
0209d3f185
Merge pull request #85 from jubalh/nosilent
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Add warning when turning off man switch
2017-09-29 10:08:47 -05:00
ef6890c31d
Add error when turning off man switch
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Print a warning and abort in case xsltproc is missing.
2017-09-29 11:01:39 +02:00
1e98b3b559
Make language less binary
2017-09-20 17:00:29 +01:00
223238d265
Add note about conditional man pages
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Closes https://github.com/shadow-maint/shadow/issues/83
2017-09-08 22:14:17 +02:00
