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A.2. Troubleshooting sudo with SSSD and sudo Debugging Logs

A.2.1. SSSD and sudo Debug Logging
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The debug logging feature enables you to log additional information about SSSD and sudo.

The sudo Debug Log File

To enable sudo debugging:
  1. Add the following lines to /etc/sudo.conf: 
    Debug sudo /var/log/sudo_debug.log all@debug
Debug sudoers.so /var/log/sudo_debug.log all@debug
    Copy to Clipboard Toggle word wrap
  2. Run the sudo command as the user you want to debug.
The /var/log/sudo_debug.log file is created automatically and provides detailed information to answer questions like:
  • What information is available about the user and the environment when running the sudo command? 
    sudo[22259] settings: debug_flags=all@debug
sudo[22259] settings: run_shell=true
sudo[22259] settings: progname=sudo
sudo[22259] settings: network_addrs=192.0.2.1/255.255.255.0 fe80::250:56ff:feb9:7d6/ffff:ffff:ffff:ffff::
sudo[22259] user_info: user=user_name
sudo[22259] user_info: pid=22259
sudo[22259] user_info: ppid=22172
sudo[22259] user_info: pgid=22259
sudo[22259] user_info: tcpgid=22259
sudo[22259] user_info: sid=22172
sudo[22259] user_info: uid=10000
sudo[22259] user_info: euid=0
sudo[22259] user_info: gid=554801393
sudo[22259] user_info: egid=554801393
sudo[22259] user_info: groups=498,6004,6005,7001,106501,554800513,554801107,554801108,554801393,554801503,554802131,554802244,554807670
sudo[22259] user_info: cwd=/
sudo[22259] user_info: tty=/dev/pts/1
sudo[22259] user_info: host=client
sudo[22259] user_info: lines=31
sudo[22259] user_info: cols=237
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  • What data sources are used to fetch sudo rules? 
    sudo[22259] <- sudo_parseln @ ./fileops.c:178 := sudoers: files sss
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  • SSSD plug-in starts with this line: 
    sudo[22259] <- sudo_sss_open @ ./sssd.c:305 := 0
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  • How many rules did SSSD return? 
    sudo[22259] Received 3 rule(s)
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  • Does a rule match or not? 
    sudo[22259] sssd/ldap sudoHost 'ALL' ... MATCH!
sudo[22259] <- user_in_group @ ./pwutil.c:1010 := false
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The SSSD Debug Log Files

To enable SSSD debugging:
  1. Add the debug_level option to the [sudo] and [domain/domain_name] sections of your /etc/sssd/sssd.conf file: 
    [domain/domain_name]
debug_level = 0x3ff0
...
[sudo]
debug_level = 0x3ff0
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  2. Restart SSSD: 
    # systemctl restart sssd
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  3. Run the sudo command to write the debug information to the log files.
The following log files are created:
The domain log file: /var/log/sssd/sssd_domain_name.log
This log file helps you to answer questions like:
  • How many rules did SSSD return? 
    [sdap_sudo_refresh_load_done] (0x0400): Received 4-rules rules
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  • What sudo rules did SSSD download from the server? 
    [sssd[be[LDAP.PB]]] [sysdb_save_sudorule] (0x0400): Adding sudo rule demo-name
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  • Are the matching rules stored in the cache? 
    [sdap_sudo_refresh_load_done] (0x0400): Sudoers is successfully stored in cache
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  • What filter was used to download the rules from the server? 
    [sdap_get_generic_ext_step] (0x0400): calling ldap_search_ext with [(&(objectClass=sudoRole)(|(!(sudoHost=*))(sudoHost=ALL)(sudoHost=client.example.com)(sudoHost=client)(sudoHost=192.0.2.1)(sudoHost=192.0.2.0/24)(sudoHost=2620:52:0:224e:21a:4aff:fe23:1394)(sudoHost=2620:52:0:224e::/64)(sudoHost=fe80::21a:4aff:fe23:1394)(sudoHost=fe80::/64)(sudoHost=+*)(|(sudoHost=*\\*)(sudoHost=*?*)(sudoHost=*\2A*)(sudoHost=*[*]*))))][dc=example,dc=com]
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    Use this filter to look up the rules in the IdM database: 
    # ldapsearch -x -D "cn=Directory Manager" -W -H ldap://server.example.com -b dc=example,dc=com '(&(objectClass=sudoRole)...)'
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The sudo responder log file: /var/log/sssd/sssd_sudo.log
This log file helps you to answer questions like:
  • How many rules did SSSD return? 
    [sssd[sudo]] [sudosrv_get_sudorules_from_cache] (0x0400): Returning 4-rules rules for [user@idm.example.com]
    Copy to Clipboard Toggle word wrap
  • What filter was applied for searching the cache of SSSD? 
    [sudosrv_get_sudorules_query_cache] (0x0200): Searching sysdb with [(&(objectClass=sudoRule)(|(sudoUser=ALL)(sudoUser=user)(sudoUser=#10001)(sudoUser=%group-1)(sudoUser=%user)(sudoUser=+*)))]
    Copy to Clipboard Toggle word wrap
  • How do I look up the rules returned from the SSSD cache? Use the following filter to look up the rules: 
    # ldbsearch -H /var/lib/sss/db/cache_domain_name.ldb -b cn=sysdb '(&(objectClass=sudoRule)...)'
    Copy to Clipboard Toggle word wrap

    Note

    The ldbsearch utility is included in the ldb-tools package.
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