* New upstream release (closes: #536182). Yes, I know 5.3p1 has been out

  for a while, but there's no GSSAPI patch available for it yet.
  - Change the default cipher order to prefer the AES CTR modes and the
    revised "arcfour256" mode to CBC mode ciphers that are susceptible to
    CPNI-957037 "Plaintext Recovery Attack Against SSH".
  - Add countermeasures to mitigate CPNI-957037-style attacks against the
    SSH protocol's use of CBC-mode ciphers. Upon detection of an invalid
    packet length or Message Authentication Code, ssh/sshd will continue
    reading up to the maximum supported packet length rather than
    immediately terminating the connection. This eliminates most of the
    known differences in behaviour that leaked information about the
    plaintext of injected data which formed the basis of this attack
    (closes: #506115, LP: #379329).
  - ForceCommand directive now accepts commandline arguments for the
    internal-sftp server (closes: #524423, LP: #362511).
  - Add AllowAgentForwarding to available Match keywords list (closes:
    #540623).
  - Make ssh(1) send the correct channel number for
    SSH2_MSG_CHANNEL_SUCCESS and SSH2_MSG_CHANNEL_FAILURE messages to
    avoid triggering 'Non-public channel' error messages on sshd(8) in
    openssh-5.1.
  - Avoid printing 'Non-public channel' warnings in sshd(8), since the
    ssh(1) has sent incorrect channel numbers since ~2004 (this reverts a
    behaviour introduced in openssh-5.1; closes: #496017).
* Update to GSSAPI patch from
  http://www.sxw.org.uk/computing/patches/openssh-5.2p1-gsskex-all-20090726.patch,
  including cascading credentials support (LP: #416958).

1 files changed, 134 insertions, 0 deletions

diff --git a/jpake.h b/jpake.h
new file mode 100644
index 000000000..a3d800cd3
--- /dev/null
+++ b/jpake.h
@@ -0,0 +1,134 @@
+/* $OpenBSD: jpake.h,v 1.1 2008/11/04 08:22:13 djm Exp $ */
+/*
+ * Copyright (c) 2008 Damien Miller.  All rights reserved.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef JPAKE_H
+#define JPAKE_H
+
+#include <sys/types.h>
+
+#include <openssl/bn.h>
+
+/* Set JPAKE_DEBUG in CFLAGS for privacy-violating debugging */
+#ifndef JPAKE_DEBUG
+# define JPAKE_DEBUG_BN(a)
+# define JPAKE_DEBUG_BUF(a)
+# define JPAKE_DEBUG_CTX(a)
+#else
+# define JPAKE_DEBUG_BN(a)      jpake_debug3_bn a
+# define JPAKE_DEBUG_BUF(a)     jpake_debug3_buf a
+# define JPAKE_DEBUG_CTX(a)     jpake_dump a
+#endif /* SCHNORR_DEBUG */
+
+struct jpake_group {
+        BIGNUM *p, *q, *g;
+};
+
+#define KZP_ID_LEN      16      /* Length of client and server IDs */
+
+struct jpake_ctx {
+        /* Parameters */
+        struct jpake_group *grp;
+
+        /* Private values shared by client and server */
+        BIGNUM *s;                      /* Secret (salted, crypted password) */
+        BIGNUM *k;                      /* Derived key */
+
+        /* Client private values (NULL for server) */
+        BIGNUM *x1;                     /* random in Zq */
+        BIGNUM *x2;                     /* random in Z*q */
+
+        /* Server private values (NULL for server) */
+        BIGNUM *x3;                     /* random in Zq */
+        BIGNUM *x4;                     /* random in Z*q */
+
+        /* Step 1: C->S */
+        u_char *client_id;              /* Anti-replay nonce */
+        u_int client_id_len;
+        BIGNUM *g_x1;                   /* g^x1 */
+        BIGNUM *g_x2;                   /* g^x2 */
+
+        /* Step 1: S->C */
+        u_char *server_id;              /* Anti-replay nonce */
+        u_int server_id_len;
+        BIGNUM *g_x3;                   /* g^x3 */
+        BIGNUM *g_x4;                   /* g^x4 */
+
+        /* Step 2: C->S */
+        BIGNUM *a;                      /* g^((x1+x3+x4)*x2*s) */
+
+        /* Step 2: S->C */
+        BIGNUM *b;                      /* g^((x1+x2+x3)*x4*s) */
+
+        /* Confirmation: C->S */
+        u_char *h_k_cid_sessid;         /* H(k || client_id || session_id) */
+        u_int h_k_cid_sessid_len;
+
+        /* Confirmation: S->C */
+        u_char *h_k_sid_sessid;         /* H(k || server_id || session_id) */
+        u_int h_k_sid_sessid_len;
+};
+
+/* jpake.c */
+struct jpake_group *jpake_default_group(void);
+BIGNUM *bn_rand_range_gt_one(const BIGNUM *high);
+int hash_buffer(const u_char *, u_int, const EVP_MD *, u_char **, u_int *);
+void jpake_debug3_bn(const BIGNUM *, const char *, ...)
+    __attribute__((__nonnull__ (2)))
+    __attribute__((format(printf, 2, 3)));
+void jpake_debug3_buf(const u_char *, u_int, const char *, ...)
+    __attribute__((__nonnull__ (3)))
+    __attribute__((format(printf, 3, 4)));
+void jpake_dump(struct jpake_ctx *, const char *, ...)
+    __attribute__((__nonnull__ (2)))
+    __attribute__((format(printf, 2, 3)));
+struct jpake_ctx *jpake_new(void);
+void jpake_free(struct jpake_ctx *);
+
+void jpake_step1(struct jpake_group *, u_char **, u_int *,
+    BIGNUM **, BIGNUM **, BIGNUM **, BIGNUM **,
+    u_char **, u_int *, u_char **, u_int *);
+
+void jpake_step2(struct jpake_group *, BIGNUM *,
+    BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *,
+    const u_char *, u_int, const u_char *, u_int,
+    const u_char *, u_int, const u_char *, u_int,
+    BIGNUM **, u_char **, u_int *);
+
+void jpake_confirm_hash(const BIGNUM *,
+    const u_char *, u_int,
+    const u_char *, u_int,
+    u_char **, u_int *);
+
+void jpake_key_confirm(struct jpake_group *, BIGNUM *, BIGNUM *,
+    BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *, BIGNUM *,
+    const u_char *, u_int, const u_char *, u_int,
+    const u_char *, u_int, const u_char *, u_int,
+    BIGNUM **, u_char **, u_int *);
+
+int jpake_check_confirm(const BIGNUM *, const u_char *, u_int,
+    const u_char *, u_int, const u_char *, u_int);
+
+/* schnorr.c */
+int schnorr_sign(const BIGNUM *, const BIGNUM *, const BIGNUM *,
+    const BIGNUM *, const BIGNUM *, const u_char *, u_int ,
+    u_char **, u_int *);
+int schnorr_verify(const BIGNUM *, const BIGNUM *, const BIGNUM *, 
+    const BIGNUM *, const u_char *, u_int,
+    const u_char *, u_int);
+
+#endif /* JPAKE_H */
+