diff options
Diffstat (limited to 'net/sunrpc/auth_gss/gss_krb5_unseal.c')
| -rw-r--r-- | net/sunrpc/auth_gss/gss_krb5_unseal.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/net/sunrpc/auth_gss/gss_krb5_unseal.c b/net/sunrpc/auth_gss/gss_krb5_unseal.c index 3e15bdb5a9e..4ede4cc4391 100644 --- a/net/sunrpc/auth_gss/gss_krb5_unseal.c +++ b/net/sunrpc/auth_gss/gss_krb5_unseal.c @@ -141,6 +141,64 @@ gss_verify_mic_v1(struct krb5_ctx *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; + + 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; + else + cksumkey = ctx->initiator_sign; + + if (make_checksum_v2(ctx, ptr, GSS_KRB5_TOK_HDR_LEN, message_buffer, 0, + cksumkey, &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, @@ -154,6 +212,9 @@ gss_verify_mic_kerberos(struct gss_ctx *gss_ctx, case ENCTYPE_DES_CBC_RAW: case ENCTYPE_DES3_CBC_RAW: 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); } } |