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Top Forums UNIX for Advanced & Expert Users any reason for a user without a homedir - security/config/application? Post 302194388 by Smiling Dragon on Monday 12th of May 2008 09:05:07 PM
Old 05-12-2008
Quote:
Originally Posted by frozentin
You could assign /tmp as the home dir for these users. I always feel a little queasy about putting somebody in "/", lest they also have sudo permissions, and (even unknowingly) cause major trouble.
I'm not such a fan of /tmp, it creates a fairly large security vulnerability; Imagine that you are a user on a solaris system where you know some users have homedirs set to /tmp. Now imagine that the server has been recently restarted and /tmp is pristine and empty and you are a somewhat mischevious sort.
Createing /tmp/.ssh won't get you very far as ssh perfoms a number of integrity checks to protect you from sneakyness here, but think about .Xauthority files for instance, I could create an xauth cookie that I know, then put an Xauthority file in /tmp and wait for a user to log in. They'd potentially 'reuse' our version of the cookie and allow us to gain control of their screen, keyboard and mouse. Alternativly, one could create a profile, .login, .cshrc, .bashrc or .kshrc that does a bunch of evil things as/to the user logging in.
Even worse/funnier they would be unable to remove or alter these files so they couldn't even fix it themselves if they noticed.

Why would sudo be affected by the homedir?
 

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rhev_agentd_consolehelper_selinux(8)		     SELinux Policy rhev_agentd_consolehelper		      rhev_agentd_consolehelper_selinux(8)

NAME
rhev_agentd_consolehelper_selinux - Security Enhanced Linux Policy for the rhev_agentd_consolehelper processes DESCRIPTION
Security-Enhanced Linux secures the rhev_agentd_consolehelper processes via flexible mandatory access control. The rhev_agentd_consolehelper processes execute with the rhev_agentd_consolehelper_t SELinux type. You can check if you have these pro- cesses running by executing the ps command with the -Z qualifier. For example: ps -eZ | grep rhev_agentd_consolehelper_t ENTRYPOINTS
The rhev_agentd_consolehelper_t SELinux type can be entered via the consolehelper_exec_t file type. The default entrypoint paths for the rhev_agentd_consolehelper_t domain are the following: /usr/bin/consolehelper PROCESS TYPES
SELinux defines process types (domains) for each process running on the system You can see the context of a process using the -Z option to ps Policy governs the access confined processes have to files. SELinux rhev_agentd_consolehelper policy is very flexible allowing users to setup their rhev_agentd_consolehelper processes in as secure a method as possible. The following process types are defined for rhev_agentd_consolehelper: rhev_agentd_consolehelper_t Note: semanage permissive -a rhev_agentd_consolehelper_t can be used to make the process type rhev_agentd_consolehelper_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated. BOOLEANS
SELinux policy is customizable based on least access required. rhev_agentd_consolehelper policy is extremely flexible and has several booleans that allow you to manipulate the policy and run rhev_agentd_consolehelper with the tightest access possible. If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server, you must turn on the authlo- gin_nsswitch_use_ldap boolean. Disabled by default. setsebool -P authlogin_nsswitch_use_ldap 1 If you want to deny any process from ptracing or debugging any other processes, you must turn on the deny_ptrace boolean. Enabled by default. setsebool -P deny_ptrace 1 If you want to allow all domains to use other domains file descriptors, you must turn on the domain_fd_use boolean. Enabled by default. setsebool -P domain_fd_use 1 If you want to allow all domains to have the kernel load modules, you must turn on the domain_kernel_load_modules boolean. Disabled by default. setsebool -P domain_kernel_load_modules 1 If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default. setsebool -P fips_mode 1 If you want to enable reading of urandom for all domains, you must turn on the global_ssp boolean. Disabled by default. setsebool -P global_ssp 1 If you want to allow confined applications to run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default. setsebool -P kerberos_enabled 1 If you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default. setsebool -P nis_enabled 1 If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default. setsebool -P nscd_use_shm 1 If you want to support NFS home directories, you must turn on the use_nfs_home_dirs boolean. Disabled by default. setsebool -P use_nfs_home_dirs 1 If you want to support SAMBA home directories, you must turn on the use_samba_home_dirs boolean. Disabled by default. setsebool -P use_samba_home_dirs 1 NSSWITCH DOMAIN
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server for the rhev_agentd_console- helper_t, you must turn on the authlogin_nsswitch_use_ldap boolean. setsebool -P authlogin_nsswitch_use_ldap 1 If you want to allow confined applications to run with kerberos for the rhev_agentd_consolehelper_t, you must turn on the kerberos_enabled boolean. setsebool -P kerberos_enabled 1 MANAGED FILES
The SELinux process type rhev_agentd_consolehelper_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions. faillog_t /var/log/btmp.* /var/log/faillog.* /var/log/tallylog.* /var/run/faillock(/.*)? krb5_host_rcache_t /var/cache/krb5rcache(/.*)? /var/tmp/nfs_0 /var/tmp/DNS_25 /var/tmp/host_0 /var/tmp/imap_0 /var/tmp/HTTP_23 /var/tmp/HTTP_48 /var/tmp/ldap_55 /var/tmp/ldap_487 /var/tmp/ldapmap1_0 lastlog_t /var/log/lastlog.* security_t /selinux systemd_passwd_var_run_t /var/run/systemd/ask-password(/.*)? /var/run/systemd/ask-password-block(/.*)? user_tmpfs_type all user content in tmpfs file systems xauth_home_t /root/.xauth.* /root/.Xauth.* /root/.serverauth.* /root/.Xauthority.* /var/lib/pqsql/.xauth.* /var/lib/pqsql/.Xauthority.* /var/lib/nxserver/home/.xauth.* /var/lib/nxserver/home/.Xauthority.* /home/[^/]*/.xauth.* /home/[^/]*/.Xauth.* /home/[^/]*/.serverauth.* /home/[^/]*/.Xauthority.* COMMANDS
semanage fcontext can also be used to manipulate default file context mappings. semanage permissive can also be used to manipulate whether or not a process type is permissive. semanage module can also be used to enable/disable/install/remove policy modules. semanage boolean can also be used to manipulate the booleans system-config-selinux is a GUI tool available to customize SELinux policy settings. AUTHOR
This manual page was auto-generated using sepolicy manpage . SEE ALSO
selinux(8), rhev_agentd_consolehelper(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8) rhev_agentd_consolehelper 14-06-10 rhev_agentd_consolehelper_selinux(8)
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