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DescriptionFabiano Fidêncio
2018-03-29 12:06:05 UTC
The externalUser support has been broken with the introduction of the fully
qualified attributes, because the provider was saving the data verbatim,
but the sudo responder expects a fully qualified name.
Reproducer:
on the server:
ipa sudocmd-add --desc='For reading log files' /usr/bin/less
ipa sudorule-add readfiles
ipa sudorule-add-user --users=lcluser
ipa sudorule-mod --hostcat=all readfiles
then on the client:
configure sssd with:
id_provider = files
sudo_provider = ipa
ipa_domain = ipa.test
run:
sudo useradd lcluser
sudo passwd lcluser
su - lcluser
sudo -l
The steps below verifies the bug and its fix:
Reproducing on past version of sssd:
SSSD version:
sssd-1.15.2-50.el7_4.13.x86_64
IPA version:
ipa-server-4.5.0-22.el7_4.x86_64
ipa-client-4.5.0-22.el7_4.x86_64
[root@kvm-02-guest11 ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.4 (Maipo)
testuser is ipa user, lcluser is external user.
[root@kvm-02-guest11 ~]# ipa sudorule-show readfiles
Rule name: readfiles
Enabled: TRUE
Host category: all
Command category: all
RunAs User category: all
RunAs Group category: all
Users: testuser
External User: lcluser
Sudo Deny Commands: /usr/bin/ls
Sudo Option: !authenticate
[root@kvm-02-guest11 ~]# su -c 'sudo -l' testuser
Matching Defaults entries for testuser on kvm-02-guest11:
!visiblepw, always_set_home, match_group_by_gid, env_reset, env_keep="COLORS
DISPLAY HOSTNAME HISTSIZE KDEDIR LS_COLORS", env_keep+="MAIL PS1 PS2 QTDIR
USERNAME LANG LC_ADDRESS LC_CTYPE", env_keep+="LC_COLLATE LC_IDENTIFICATION
LC_MEASUREMENT LC_MESSAGES", env_keep+="LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER
LC_TELEPHONE", env_keep+="LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET
XAUTHORITY", secure_path=/sbin\:/bin\:/usr/sbin\:/usr/bin
User testuser may run the following commands on kvm-02-guest11:
(ALL : ALL) NOPASSWD: ALL, !/usr/bin/ls
[root@kvm-02-guest11 ~]# su -c 'sudo -l' lcluser
sudo: no tty present and no askpass program specified
Reproducing on a version later the version than fixed version of sssd:
SSSD version:
sssd-1.16.2-12.el7.x86_64
IPA version:
ipa-server-4.5.4-10.el7_5.3.x86_64
ipa-client-4.5.4-10.el7_5.3.x86_64
ipa user is testuser, external user is lcluser
[root@kvm-02-guest24 ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 7.5 (Maipo)
[root@kvm-02-guest24 ~]# ipa sudorule-show readfiles
Rule name: readfiles
Enabled: TRUE
Host category: all
Command category: all
RunAs User category: all
RunAs Group category: all
Users: testuser
External User: lcluser
Sudo Deny Commands: /usr/bin/ls
Sudo Option: !authenticate
[root@kvm-02-guest24 ~]# su -c 'sudo -l' testuser
Matching Defaults entries for testuser on kvm-02-guest24:
!visiblepw, always_set_home, match_group_by_gid, env_reset, env_keep="COLORS
DISPLAY HOSTNAME HISTSIZE KDEDIR LS_COLORS", env_keep+="MAIL PS1 PS2 QTDIR
USERNAME LANG LC_ADDRESS LC_CTYPE", env_keep+="LC_COLLATE LC_IDENTIFICATION
LC_MEASUREMENT LC_MESSAGES", env_keep+="LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER
LC_TELEPHONE", env_keep+="LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET
XAUTHORITY", secure_path=/sbin\:/bin\:/usr/sbin\:/usr/bin
User testuser may run the following commands on kvm-02-guest24:
(ALL : ALL) NOPASSWD: ALL, !/usr/bin/ls
[root@kvm-02-guest24 ~]# su -c 'sudo -l' lcluser
Matching Defaults entries for lcluser on kvm-02-guest24:
!visiblepw, always_set_home, match_group_by_gid, env_reset, env_keep="COLORS
DISPLAY HOSTNAME HISTSIZE KDEDIR LS_COLORS", env_keep+="MAIL PS1 PS2 QTDIR
USERNAME LANG LC_ADDRESS LC_CTYPE", env_keep+="LC_COLLATE LC_IDENTIFICATION
LC_MEASUREMENT LC_MESSAGES", env_keep+="LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER
LC_TELEPHONE", env_keep+="LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET
XAUTHORITY", secure_path=/sbin\:/bin\:/usr/sbin\:/usr/bin
User lcluser may run the following commands on kvm-02-guest24:
(ALL : ALL) NOPASSWD: ALL, !/usr/bin/ls
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://access.redhat.com/errata/RHSA-2018:3158
The externalUser support has been broken with the introduction of the fully qualified attributes, because the provider was saving the data verbatim, but the sudo responder expects a fully qualified name. Reproducer: on the server: ipa sudocmd-add --desc='For reading log files' /usr/bin/less ipa sudorule-add readfiles ipa sudorule-add-user --users=lcluser ipa sudorule-mod --hostcat=all readfiles then on the client: configure sssd with: id_provider = files sudo_provider = ipa ipa_domain = ipa.test run: sudo useradd lcluser sudo passwd lcluser su - lcluser sudo -l