[krbdev.mit.edu #2595] Problem with "rlogin" if "root" can't read user's home-directory

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Date: Wed, 9 Jun 2004 15:33:12 +0200 (MEST)
To: krb5-bugs at mit.edu
From: alexandre.schmitt at cea.fr
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Subject: Bug with "rlogin"
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>Submitter-Id:	net
>Originator:	Alexandre Schmitt
>Organization:
	CEA 

>Confidential:	no 
>Synopsis:	Problem with "rlogin" if "root" can't read user's home-directory
>Severity:	serious
>Priority:	medium
>Category:	krb5-appl
>Class:		sw-bug
>Release:	krb5-1.3.3
>Environment:
	
	System: SunOS surf 5.8 Generic_114018-01 sun4u sparc SUNW,Sun-Blade-100
	Architecture: sun4

>Description:
	
	There is a problem when a user have a home-directory without "read" for "other" in UNIX right and his home-directory is on a NFS server without root access.
	After a "rlogin" the user is with home = "/"

>How-To-Repeat:
	
	bash-2.05$ cd; ls -ld `pwd`
		drwxr-s---  23 user1 group1          4096 Jun  8  2004 /home/group1/user1
	bash-2.05$ rlogin surf
		No directory /home/s8/user1!
		Logging in with home = "/"
		Last login: Tue Jun  8 14:29:17 from :0
 	surf%
	
>Fix:
	
	The problem is because of the function "chdir" in the file src/appl/bsd/login.c
	When the function "chdir" is called, the program is root. The program should call "chdir" when it has the user's identity.
	We have just to move the "chdir" in src/appl/bsd/login.c:

	diff login.c login.c.ori

	1449A1450,1457
	>	if (chdir(pwd->pw_dir) < 0) {
	>	printf("No directory %s!\n", pwd->pw_dir);
	>	if (chdir("/"))
	>	    exit(0);
	>	pwd->pw_dir = "/";
	>	printf("Logging in with home = \"/\".\n");
	>	}
	>
	1656,1662d1663
	<	if (chdir(pwd->pw_dir) < 0) {
	<	printf("No directory %s!\n", pwd->pw_dir);
	<	if (chdir("/"))
	<		exit(0);
	<	pwd->pw_dir = "/";
	<	printf("Logging in with home = \"/\".\n");
	<	}