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Top Forums UNIX for Advanced & Expert Users Allow user without dir write permission to execute a script that creates files Post 302882714 by MadeInGermany on Wednesday 8th of January 2014 05:54:58 PM
Old 01-08-2014
I think sudo is successful because it is setuid-root.
Then it can do a setuid(0) to remove restrictions, maybe along with some other magic, and finally it can setuid(user) to switch to a user and run an unrestricted exec().
If you have time, study the sudo source files (sudo.c etc.)!
 

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PAM_TIMESTAMP_CHECK(8)						 Linux-PAM Manual					    PAM_TIMESTAMP_CHECK(8)

NAME
pam_timestamp_check - Check to see if the default timestamp is valid SYNOPSIS
pam_timestamp_check [-k] [-d] [target_user] DESCRIPTION
With no arguments pam_timestamp_check will check to see if the default timestamp is valid, or optionally remove it. OPTIONS
-k Instead of checking the validity of a timestamp, remove it. This is analogous to sudo's -k option. -d Instead of returning validity using an exit status, loop indefinitely, polling regularly and printing the status on standard output. target_user By default pam_timestamp_check checks or removes timestamps generated by pam_timestamp when the user authenticates as herself. When the user authenticates as a different user, the name of the timestamp file changes to accommodate this. target_user allows to specify this user name. RETURN VALUES
0 The timestamp is valid. 2 The binary is not setuid root. 3 Invalid invocation. 4 User is unknown. 5 Permissions error. 6 Invalid controlling tty. 7 Timestamp is not valid. NOTES
Users can get confused when they are not always asked for passwords when running a given program. Some users reflexively begin typing information before noticing that it is not being asked for. EXAMPLES
auth sufficient pam_timestamp.so verbose auth required pam_unix.so session required pam_unix.so session optional pam_timestamp.so FILES
/var/run/sudo/... timestamp files and directories SEE ALSO
pam_timestamp_check(8), pam.conf(5), pam.d(5), pam(8) AUTHOR
pam_tally was written by Nalin Dahyabhai. Linux-PAM Manual 06/04/2011 PAM_TIMESTAMP_CHECK(8)
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