gss_krb5: add support for triple-des encryption
Add the final pieces to support the triple-des encryption type.
Signed-off-by: Kevin Coffman <kwc@citi.umich.edu>
Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c
index cae04d7..bb76873 100644
--- a/net/sunrpc/auth_gss/gss_krb5_crypto.c
+++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c
@@ -184,6 +184,9 @@
checksumdata + checksumlen - kctx->gk5e->cksumlength,
kctx->gk5e->cksumlength);
break;
+ case CKSUMTYPE_HMAC_SHA1_DES3:
+ memcpy(cksumout->data, checksumdata, kctx->gk5e->cksumlength);
+ break;
default:
BUG();
break;
diff --git a/net/sunrpc/auth_gss/gss_krb5_keys.c b/net/sunrpc/auth_gss/gss_krb5_keys.c
index 253b414..d546687 100644
--- a/net/sunrpc/auth_gss/gss_krb5_keys.c
+++ b/net/sunrpc/auth_gss/gss_krb5_keys.c
@@ -250,3 +250,56 @@
err_return:
return ret;
}
+
+#define smask(step) ((1<<step)-1)
+#define pstep(x, step) (((x)&smask(step))^(((x)>>step)&smask(step)))
+#define parity_char(x) pstep(pstep(pstep((x), 4), 2), 1)
+
+static void mit_des_fixup_key_parity(u8 key[8])
+{
+ int i;
+ for (i = 0; i < 8; i++) {
+ key[i] &= 0xfe;
+ key[i] |= 1^parity_char(key[i]);
+ }
+}
+
+/*
+ * This is the des3 key derivation postprocess function
+ */
+u32 gss_krb5_des3_make_key(const struct gss_krb5_enctype *gk5e,
+ struct xdr_netobj *randombits,
+ struct xdr_netobj *key)
+{
+ int i;
+ u32 ret = EINVAL;
+
+ if (key->len != 24) {
+ dprintk("%s: key->len is %d\n", __func__, key->len);
+ goto err_out;
+ }
+ if (randombits->len != 21) {
+ dprintk("%s: randombits->len is %d\n",
+ __func__, randombits->len);
+ goto err_out;
+ }
+
+ /* take the seven bytes, move them around into the top 7 bits of the
+ 8 key bytes, then compute the parity bits. Do this three times. */
+
+ for (i = 0; i < 3; i++) {
+ memcpy(key->data + i*8, randombits->data + i*7, 7);
+ key->data[i*8+7] = (((key->data[i*8]&1)<<1) |
+ ((key->data[i*8+1]&1)<<2) |
+ ((key->data[i*8+2]&1)<<3) |
+ ((key->data[i*8+3]&1)<<4) |
+ ((key->data[i*8+4]&1)<<5) |
+ ((key->data[i*8+5]&1)<<6) |
+ ((key->data[i*8+6]&1)<<7));
+
+ mit_des_fixup_key_parity(key->data + i*8);
+ }
+ ret = 0;
+err_out:
+ return ret;
+}
diff --git a/net/sunrpc/auth_gss/gss_krb5_mech.c b/net/sunrpc/auth_gss/gss_krb5_mech.c
index 03f1dcd..7cebdf8 100644
--- a/net/sunrpc/auth_gss/gss_krb5_mech.c
+++ b/net/sunrpc/auth_gss/gss_krb5_mech.c
@@ -71,6 +71,26 @@
.cksumlength = 8,
.keyed_cksum = 0,
},
+ /*
+ * 3DES
+ */
+ {
+ .etype = ENCTYPE_DES3_CBC_RAW,
+ .ctype = CKSUMTYPE_HMAC_SHA1_DES3,
+ .name = "des3-hmac-sha1",
+ .encrypt_name = "cbc(des3_ede)",
+ .cksum_name = "hmac(sha1)",
+ .encrypt = krb5_encrypt,
+ .decrypt = krb5_decrypt,
+ .mk_key = gss_krb5_des3_make_key,
+ .signalg = SGN_ALG_HMAC_SHA1_DES3_KD,
+ .sealalg = SEAL_ALG_DES3KD,
+ .keybytes = 21,
+ .keylength = 24,
+ .blocksize = 8,
+ .cksumlength = 20,
+ .keyed_cksum = 1,
+ },
};
static const int num_supported_enctypes =
@@ -440,6 +460,9 @@
p = simple_get_bytes(p, end, &ctx->enctype, sizeof(ctx->enctype));
if (IS_ERR(p))
goto out_err;
+ /* Map ENCTYPE_DES3_CBC_SHA1 to ENCTYPE_DES3_CBC_RAW */
+ if (ctx->enctype == ENCTYPE_DES3_CBC_SHA1)
+ ctx->enctype = ENCTYPE_DES3_CBC_RAW;
ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
if (ctx->gk5e == NULL) {
dprintk("gss_kerberos_mech: unsupported krb5 enctype %u\n",
diff --git a/net/sunrpc/auth_gss/gss_krb5_seal.c b/net/sunrpc/auth_gss/gss_krb5_seal.c
index cd51271..7ede900 100644
--- a/net/sunrpc/auth_gss/gss_krb5_seal.c
+++ b/net/sunrpc/auth_gss/gss_krb5_seal.c
@@ -142,6 +142,7 @@
default:
BUG();
case ENCTYPE_DES_CBC_RAW:
+ case ENCTYPE_DES3_CBC_RAW:
return gss_get_mic_v1(ctx, text, token);
}
}
diff --git a/net/sunrpc/auth_gss/gss_krb5_unseal.c b/net/sunrpc/auth_gss/gss_krb5_unseal.c
index 7515bff..3e15bdb 100644
--- a/net/sunrpc/auth_gss/gss_krb5_unseal.c
+++ b/net/sunrpc/auth_gss/gss_krb5_unseal.c
@@ -152,6 +152,7 @@
default:
BUG();
case ENCTYPE_DES_CBC_RAW:
+ case ENCTYPE_DES3_CBC_RAW:
return gss_verify_mic_v1(ctx, message_buffer, read_token);
}
}
diff --git a/net/sunrpc/auth_gss/gss_krb5_wrap.c b/net/sunrpc/auth_gss/gss_krb5_wrap.c
index 2eb3046..1c8ebd3 100644
--- a/net/sunrpc/auth_gss/gss_krb5_wrap.c
+++ b/net/sunrpc/auth_gss/gss_krb5_wrap.c
@@ -350,6 +350,7 @@
default:
BUG();
case ENCTYPE_DES_CBC_RAW:
+ case ENCTYPE_DES3_CBC_RAW:
return gss_wrap_kerberos_v1(kctx, offset, buf, pages);
}
}
@@ -363,6 +364,7 @@
default:
BUG();
case ENCTYPE_DES_CBC_RAW:
+ case ENCTYPE_DES3_CBC_RAW:
return gss_unwrap_kerberos_v1(kctx, offset, buf);
}
}