Attachment 1777 Details for Bug 1679 – /home/djm/auth-check-chroot-shell.diff

[patch] /home/djm/auth-check-chroot-shell.diff

auth-check-chroot-shell.diff (text/plain), 1.96 KB, created by Damien Miller on 2010-01-13 23:25:59 AEDT

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Creator: Damien Miller

Created: 2010-01-13 23:25:59 AEDT

Size: 1.96 KB

patch

obsolete

>Index: auth.c
>===================================================================
>RCS file: /cvs/src/usr.bin/ssh/auth.c,v
>retrieving revision 1.82
>diff -u -p -r1.82 auth.c
>--- auth.c	13 Jan 2010 00:19:04 -0000	1.82
>+++ auth.c	13 Jan 2010 12:25:08 -0000
>@@ -79,7 +79,7 @@ allowed_user(struct passwd * pw)
> {
> 	struct stat st;
> 	const char *hostname = NULL, *ipaddr = NULL;
>-	char *shell;
>+	char *shell, *tmp, *chroot_path;
> 	u_int i;
> 
> 	/* Shouldn't be called if pw is NULL, but better safe than sorry... */
>@@ -90,20 +90,40 @@ allowed_user(struct passwd * pw)
> 	 * Get the shell from the password data.  An empty shell field is
> 	 * legal, and means /bin/sh.
> 	 */
>-	shell = (pw->pw_shell[0] == '\0') ? _PATH_BSHELL : pw->pw_shell;
>+	shell = xstrdup((pw->pw_shell[0] == '\0') ?
>+	    _PATH_BSHELL : pw->pw_shell);
>+
>+        /*
>+         * Amend shell if chroot is requested.
>+         */
>+        if (options.chroot_directory != NULL &&
>+            strcasecmp(options.chroot_directory, "none") != 0) {
>+                tmp = tilde_expand_filename(options.chroot_directory,
>+                    pw->pw_uid);
>+                chroot_path = percent_expand(tmp, "h", pw->pw_dir,
>+                    "u", pw->pw_name, (char *)NULL);
>+		xfree(tmp);
>+                xasprintf(&tmp, "%s/%s", chroot_path, shell);
>+		xfree(shell);
>+                shell = tmp;
>+                free(chroot_path);
>+        }
> 
> 	/* deny if shell does not exists or is not executable */
> 	if (stat(shell, &st) != 0) {
> 		logit("User %.100s not allowed because shell %.100s does not exist",
> 		    pw->pw_name, shell);
>+		xfree(shell);
> 		return 0;
> 	}
> 	if (S_ISREG(st.st_mode) == 0 ||
> 	    (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP)) == 0) {
> 		logit("User %.100s not allowed because shell %.100s is not executable",
> 		    pw->pw_name, shell);
>+		xfree(shell);
> 		return 0;
> 	}
>+	xfree(shell);
> 
> 	if (options.num_deny_users > 0 || options.num_allow_users > 0 ||
> 	    options.num_deny_groups > 0 || options.num_allow_groups > 0) {

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