X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=utils%2Fmount%2Fnfsumount.c;h=381ca6e344e0bdf13d21a1760a651597f8777325;hp=4208ade291d1c63898f5b374df568f10c4ac9243;hb=03187a3cf1995b487c291ea8bc746a9e29e1c2f4;hpb=d80e49e559da01cd0b4cb23eb9e2351aca7e2ec5

diff --git a/utils/mount/nfsumount.c b/utils/mount/nfsumount.c
index 4208ade..381ca6e 100644
--- a/utils/mount/nfsumount.c
+++ b/utils/mount/nfsumount.c
@@ -17,12 +17,14 @@
  *
  */
 
+#include <unistd.h>
 #include <stdio.h>
 #include <errno.h>
 #include <getopt.h>
 #include <mntent.h>
 #include <sys/mount.h>
 #include <ctype.h>
+#include <pwd.h>
 
 #include "xcommon.h"
 #include "fstab.h"
@@ -147,7 +149,7 @@ int del_mtab(const char *spec, const char *node)
                 res = mount(spec, node, NULL,
                             MS_MGC_VAL | MS_REMOUNT | MS_RDONLY, NULL);
                 if (res == 0) {
-                        nfs_mntent_t remnt;
+                        struct mntent remnt;
                         fprintf(stderr,
                                 _("umount: %s busy - remounted read-only\n"),
                                 spec);
@@ -324,6 +326,35 @@ int nfsumount(int argc, char *argv[])
 	if (!mc && verbose)
 		printf(_("Could not find %s in mtab\n"), spec);
 
+	if (getuid() != 0) {
+		/* only permitted if "user=" or "users" is in mount options */
+		if (!mc) {
+		only_root:
+			fprintf(stderr,"%s: You are not permitted to unmount %s\n",
+				progname, spec);
+			return 0;
+		}
+		if (hasmntopt(&mc->m, "users") == NULL) {
+			char *opt = hasmntopt(&mc->m, "user");
+			struct passwd *pw;
+			char *comma;
+			int len;
+			if (!opt)
+				goto only_root;
+			if (opt[5] != '=')
+				goto only_root;
+			comma = strchr(opt, ',');
+			if (comma)
+				len = comma - (opt + 5);
+			else
+				len = strlen(opt+5);
+			pw = getpwuid(getuid());
+			if (pw == NULL || strlen(pw->pw_name) != len
+			    || strncmp(pw->pw_name, opt+5, len) != 0)
+				goto only_root;
+		}
+	}
+
 	ret = 0;
 	if (mc) {
 		if (!lazy)