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From 4306b434038de7e2b17d3c4a6cfd87db469d3bda Mon Sep 17 00:00:00 2001
From: Adam Jackson <ajax@redhat.com>
Date: Mon, 10 Dec 2007 11:26:57 -0500
Subject: [PATCH] Hack for proper MIT-SHM rejection for ssh-forwarded clients.
---
Xext/shm.c | 15 +++++++++++++++
1 files changed, 15 insertions(+), 0 deletions(-)
diff --git a/Xext/shm.c b/Xext/shm.c
index 5937a03..5376c19 100644
--- a/Xext/shm.c
+++ b/Xext/shm.c
@@ -381,8 +381,21 @@
mode_t mask;
int uidset = 0, gidset = 0;
LocalClientCredRec *lcc;
+ Bool is_ssh = FALSE;
if (GetLocalClientCreds(client, &lcc) != -1) {
+#ifdef linux
+ if (lcc->fieldsSet & LCC_PID_SET) {
+ /* ssh isn't actually a local client */
+ char exe[64], buf[64];
+
+ memset(buf, 0, 64);
+ snprintf(exe, 64, "/proc/%d/exe", lcc->pid);
+ readlink(exe, buf, 63);
+ if (strstr(buf, "/ssh"))
+ is_ssh = TRUE;
+ }
+#endif
if (lcc->fieldsSet & LCC_UID_SET) {
uid = lcc->euid;
@@ -401,6 +414,9 @@
}
#endif
FreeLocalClientCreds(lcc);
+
+ if (is_ssh)
+ return -1;
if (uidset) {
/* User id 0 always gets access */
--
1.5.3.4
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