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-rw-r--r--patches/source/ppp/ppp.crypt.diff64
1 files changed, 64 insertions, 0 deletions
diff --git a/patches/source/ppp/ppp.crypt.diff b/patches/source/ppp/ppp.crypt.diff
new file mode 100644
index 00000000..2e39af2b
--- /dev/null
+++ b/patches/source/ppp/ppp.crypt.diff
@@ -0,0 +1,64 @@
+From 04c4348108d847e034dd91066cc6843f60d71731 Mon Sep 17 00:00:00 2001
+From: Paul Mackerras <paulus@samba.org>
+Date: Sun, 20 May 2012 14:14:55 +1000
+Subject: [PATCH] pppd: Don't crash if crypt() returns NULL
+
+It is possible for crypt() to return NULL under some circumstances,
+so we need to check the return value before passing it to strcmp().
+If we do get NULL from crypt(), treat it as an authentication failure.
+
+Reported-by: Paul Wouters <pwouters@redhat.com>
+Signed-off-by: Paul Mackerras <paulus@samba.org>
+---
+ pppd/auth.c | 8 +++++---
+ pppd/session.c | 7 +++++--
+ 2 files changed, 10 insertions(+), 5 deletions(-)
+
+diff --git a/pppd/auth.c b/pppd/auth.c
+index fb71944..883b7f5 100644
+--- a/pppd/auth.c
++++ b/pppd/auth.c
+@@ -1442,9 +1442,11 @@ check_passwd(unit, auser, userlen, apasswd, passwdlen, msg)
+ }
+ if (secret[0] != 0 && !login_secret) {
+ /* password given in pap-secrets - must match */
+- if ((cryptpap || strcmp(passwd, secret) != 0)
+- && strcmp(crypt(passwd, secret), secret) != 0)
+- ret = UPAP_AUTHNAK;
++ if (cryptpap || strcmp(passwd, secret) != 0) {
++ char *cbuf = crypt(passwd, secret);
++ if (!cbuf || strcmp(cbuf, secret) != 0)
++ ret = UPAP_AUTHNAK;
++ }
+ }
+ }
+ fclose(f);
+diff --git a/pppd/session.c b/pppd/session.c
+index 32901a2..56385dd 100644
+--- a/pppd/session.c
++++ b/pppd/session.c
+@@ -178,6 +178,7 @@ session_start(flags, user, passwd, ttyName, msg)
+ bool try_session = 0;
+ #else /* #ifdef USE_PAM */
+ struct passwd *pw;
++ char *cbuf;
+ #ifdef HAS_SHADOW
+ struct spwd *spwd;
+ struct spwd *getspnam();
+@@ -348,8 +349,10 @@ session_start(flags, user, passwd, ttyName, msg)
+ /*
+ * If no passwd, don't let them login if we're authenticating.
+ */
+- if (pw->pw_passwd == NULL || strlen(pw->pw_passwd) < 2
+- || strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) != 0)
++ if (pw->pw_passwd == NULL || strlen(pw->pw_passwd) < 2)
++ return SESSION_FAILED;
++ cbuf = crypt(passwd, pw->pw_passwd);
++ if (!cbuf || strcmp(cbuf, pw->pw_passwd) != 0)
+ return SESSION_FAILED;
+ }
+
+--
+1.7.10.4
+
+