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Diffstat (limited to 'net/sunrpc/auth_gss/gss_krb5_unseal.c')
-rw-r--r--net/sunrpc/auth_gss/gss_krb5_unseal.c113
1 files changed, 101 insertions, 12 deletions
diff --git a/net/sunrpc/auth_gss/gss_krb5_unseal.c b/net/sunrpc/auth_gss/gss_krb5_unseal.c
index ce6c247edad..6cd930f3678 100644
--- a/net/sunrpc/auth_gss/gss_krb5_unseal.c
+++ b/net/sunrpc/auth_gss/gss_krb5_unseal.c
@@ -3,7 +3,7 @@
*
* Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5unseal.c
*
- * Copyright (c) 2000 The Regents of the University of Michigan.
+ * Copyright (c) 2000-2008 The Regents of the University of Michigan.
* All rights reserved.
*
* Andy Adamson <andros@umich.edu>
@@ -70,20 +70,21 @@
/* read_token is a mic token, and message_buffer is the data that the mic was
* supposedly taken over. */
-u32
-gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
+static u32
+gss_verify_mic_v1(struct krb5_ctx *ctx,
struct xdr_buf *message_buffer, struct xdr_netobj *read_token)
{
- struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
int signalg;
int sealalg;
- char cksumdata[16];
- struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata};
+ char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+ struct xdr_netobj md5cksum = {.len = sizeof(cksumdata),
+ .data = cksumdata};
s32 now;
int direction;
u32 seqnum;
unsigned char *ptr = (unsigned char *)read_token->data;
int bodysize;
+ u8 *cksumkey;
dprintk("RPC: krb5_read_token\n");
@@ -98,7 +99,7 @@ gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
/* XXX sanity-check bodysize?? */
signalg = ptr[2] + (ptr[3] << 8);
- if (signalg != SGN_ALG_DES_MAC_MD5)
+ if (signalg != ctx->gk5e->signalg)
return GSS_S_DEFECTIVE_TOKEN;
sealalg = ptr[4] + (ptr[5] << 8);
@@ -108,13 +109,17 @@ gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
if ((ptr[6] != 0xff) || (ptr[7] != 0xff))
return GSS_S_DEFECTIVE_TOKEN;
- if (make_checksum("md5", ptr, 8, message_buffer, 0, &md5cksum))
- return GSS_S_FAILURE;
+ if (ctx->gk5e->keyed_cksum)
+ cksumkey = ctx->cksum;
+ else
+ cksumkey = NULL;
- if (krb5_encrypt(ctx->seq, NULL, md5cksum.data, md5cksum.data, 16))
+ if (make_checksum(ctx, ptr, 8, message_buffer, 0,
+ cksumkey, KG_USAGE_SIGN, &md5cksum))
return GSS_S_FAILURE;
- if (memcmp(md5cksum.data + 8, ptr + GSS_KRB5_TOK_HDR_LEN, 8))
+ if (memcmp(md5cksum.data, ptr + GSS_KRB5_TOK_HDR_LEN,
+ ctx->gk5e->cksumlength))
return GSS_S_BAD_SIG;
/* it got through unscathed. Make sure the context is unexpired */
@@ -126,7 +131,8 @@ gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
/* do sequencing checks */
- if (krb5_get_seq_num(ctx->seq, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8, &direction, &seqnum))
+ if (krb5_get_seq_num(ctx, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8,
+ &direction, &seqnum))
return GSS_S_FAILURE;
if ((ctx->initiate && direction != 0xff) ||
@@ -135,3 +141,86 @@ gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
return GSS_S_COMPLETE;
}
+
+static u32
+gss_verify_mic_v2(struct krb5_ctx *ctx,
+ struct xdr_buf *message_buffer, struct xdr_netobj *read_token)
+{
+ char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+ struct xdr_netobj cksumobj = {.len = sizeof(cksumdata),
+ .data = cksumdata};
+ s32 now;
+ u64 seqnum;
+ u8 *ptr = read_token->data;
+ u8 *cksumkey;
+ u8 flags;
+ int i;
+ unsigned int cksum_usage;
+
+ dprintk("RPC: %s\n", __func__);
+
+ if (be16_to_cpu(*((__be16 *)ptr)) != KG2_TOK_MIC)
+ return GSS_S_DEFECTIVE_TOKEN;
+
+ flags = ptr[2];
+ if ((!ctx->initiate && (flags & KG2_TOKEN_FLAG_SENTBYACCEPTOR)) ||
+ (ctx->initiate && !(flags & KG2_TOKEN_FLAG_SENTBYACCEPTOR)))
+ return GSS_S_BAD_SIG;
+
+ if (flags & KG2_TOKEN_FLAG_SEALED) {
+ dprintk("%s: token has unexpected sealed flag\n", __func__);
+ return GSS_S_FAILURE;
+ }
+
+ for (i = 3; i < 8; i++)
+ if (ptr[i] != 0xff)
+ return GSS_S_DEFECTIVE_TOKEN;
+
+ if (ctx->initiate) {
+ cksumkey = ctx->acceptor_sign;
+ cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
+ } else {
+ cksumkey = ctx->initiator_sign;
+ cksum_usage = KG_USAGE_INITIATOR_SIGN;
+ }
+
+ if (make_checksum_v2(ctx, ptr, GSS_KRB5_TOK_HDR_LEN, message_buffer, 0,
+ cksumkey, cksum_usage, &cksumobj))
+ return GSS_S_FAILURE;
+
+ if (memcmp(cksumobj.data, ptr + GSS_KRB5_TOK_HDR_LEN,
+ ctx->gk5e->cksumlength))
+ return GSS_S_BAD_SIG;
+
+ /* it got through unscathed. Make sure the context is unexpired */
+ now = get_seconds();
+ if (now > ctx->endtime)
+ return GSS_S_CONTEXT_EXPIRED;
+
+ /* do sequencing checks */
+
+ seqnum = be64_to_cpup((__be64 *)ptr + 8);
+
+ return GSS_S_COMPLETE;
+}
+
+u32
+gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
+ struct xdr_buf *message_buffer,
+ struct xdr_netobj *read_token)
+{
+ struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
+
+ switch (ctx->enctype) {
+ default:
+ BUG();
+ case ENCTYPE_DES_CBC_RAW:
+ case ENCTYPE_DES3_CBC_RAW:
+ case ENCTYPE_ARCFOUR_HMAC:
+ return gss_verify_mic_v1(ctx, message_buffer, read_token);
+ case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+ case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+ return gss_verify_mic_v2(ctx, message_buffer, read_token);
+ }
+}
+