#include <linux/sunrpc/gss_spkm3.h>
#include <linux/random.h>
#include <linux/crypto.h>
+#include <linux/pagemap.h>
+#include <linux/scatterlist.h>
+#include <linux/sunrpc/xdr.h>
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_AUTH
#endif
+const struct xdr_netobj hmac_md5_oid = { 8, "\x2B\x06\x01\x05\x05\x08\x01\x01"};
+const struct xdr_netobj cast5_cbc_oid = {9, "\x2A\x86\x48\x86\xF6\x7D\x07\x42\x0A"};
+
/*
* spkm3_make_token()
*
int ctxelen = 0, ctxzbit = 0;
int md5elen = 0, md5zbit = 0;
- dprintk("RPC: spkm3_make_token\n");
-
now = jiffies;
if (ctx->ctx_id.len != 16) {
- dprintk("RPC: spkm3_make_token BAD ctx_id.len %d\n",
- ctx->ctx_id.len);
+ dprintk("RPC: spkm3_make_token BAD ctx_id.len %d\n",
+ ctx->ctx_id.len);
goto out_err;
}
-
- switch (ctx->intg_alg) {
- case NID_md5:
- checksum_type = CKSUMTYPE_RSA_MD5;
- break;
- default:
- dprintk("RPC: gss_spkm3_seal: ctx->signalg %d not"
- " supported\n", ctx->intg_alg);
- goto out_err;
- }
- /* XXX since we don't support WRAP, perhaps we don't care... */
- if (ctx->conf_alg != NID_cast5_cbc) {
- dprintk("RPC: gss_spkm3_seal: ctx->sealalg %d not supported\n",
- ctx->conf_alg);
+
+ if (!g_OID_equal(&ctx->intg_alg, &hmac_md5_oid)) {
+ dprintk("RPC: gss_spkm3_seal: unsupported I-ALG "
+ "algorithm. only support hmac-md5 I-ALG.\n");
+ goto out_err;
+ } else
+ checksum_type = CKSUMTYPE_HMAC_MD5;
+
+ if (!g_OID_equal(&ctx->conf_alg, &cast5_cbc_oid)) {
+ dprintk("RPC: gss_spkm3_seal: unsupported C-ALG "
+ "algorithm\n");
goto out_err;
}
/* Calculate checksum over the mic-header */
asn1_bitstring_len(&ctx->ctx_id, &ctxelen, &ctxzbit);
spkm3_mic_header(&mic_hdr.data, &mic_hdr.len, ctx->ctx_id.data,
- ctxelen, ctxzbit);
-
- if (make_checksum(checksum_type, mic_hdr.data, mic_hdr.len,
- text, 0, &md5cksum))
+ ctxelen, ctxzbit);
+ if (make_spkm3_checksum(checksum_type, &ctx->derived_integ_key,
+ (char *)mic_hdr.data, mic_hdr.len,
+ text, 0, &md5cksum))
goto out_err;
asn1_bitstring_len(&md5cksum, &md5elen, &md5zbit);
tokenlen = 10 + ctxelen + 1 + md5elen + 1;
/* Create token header using generic routines */
- token->len = g_token_size(&ctx->mech_used, tokenlen);
+ token->len = g_token_size(&ctx->mech_used, tokenlen + 2);
ptr = token->data;
- g_make_token_header(&ctx->mech_used, tokenlen, &ptr);
+ g_make_token_header(&ctx->mech_used, tokenlen + 2, &ptr);
spkm3_make_mic_token(&ptr, tokenlen, &mic_hdr, &md5cksum, md5elen, md5zbit);
} else if (toktype == SPKM_WRAP_TOK) { /* Not Supported */
- dprintk("RPC: gss_spkm3_seal: SPKM_WRAP_TOK not supported\n");
+ dprintk("RPC: gss_spkm3_seal: SPKM_WRAP_TOK "
+ "not supported\n");
goto out_err;
}
token->len = 0;
return GSS_S_FAILURE;
}
+
+static int
+spkm3_checksummer(struct scatterlist *sg, void *data)
+{
+ struct hash_desc *desc = data;
+
+ return crypto_hash_update(desc, sg, sg->length);
+}
+
+/* checksum the plaintext data and hdrlen bytes of the token header */
+s32
+make_spkm3_checksum(s32 cksumtype, struct xdr_netobj *key, char *header,
+ unsigned int hdrlen, struct xdr_buf *body,
+ unsigned int body_offset, struct xdr_netobj *cksum)
+{
+ char *cksumname;
+ struct hash_desc desc; /* XXX add to ctx? */
+ struct scatterlist sg[1];
+ int err;
+
+ switch (cksumtype) {
+ case CKSUMTYPE_HMAC_MD5:
+ cksumname = "hmac(md5)";
+ break;
+ default:
+ dprintk("RPC: spkm3_make_checksum:"
+ " unsupported checksum %d", cksumtype);
+ return GSS_S_FAILURE;
+ }
+
+ if (key->data == NULL || key->len <= 0) return GSS_S_FAILURE;
+
+ desc.tfm = crypto_alloc_hash(cksumname, 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(desc.tfm))
+ return GSS_S_FAILURE;
+ cksum->len = crypto_hash_digestsize(desc.tfm);
+ desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ err = crypto_hash_setkey(desc.tfm, key->data, key->len);
+ if (err)
+ goto out;
+
+ err = crypto_hash_init(&desc);
+ if (err)
+ goto out;
+
+ sg_init_one(sg, header, hdrlen);
+ crypto_hash_update(&desc, sg, sg->length);
+
+ xdr_process_buf(body, body_offset, body->len - body_offset,
+ spkm3_checksummer, &desc);
+ crypto_hash_final(&desc, cksum->data);
+
+out:
+ crypto_free_hash(desc.tfm);
+
+ return err ? GSS_S_FAILURE : 0;
+}