--- /dev/null
+/*
+ * linux/net/sunrpc/gss_krb5_mech.c
+ *
+ * Copyright (c) 2001-2008 The Regents of the University of Michigan.
+ * All rights reserved.
+ *
+ * Andy Adamson <andros@umich.edu>
+ * J. Bruce Fields <bfields@umich.edu>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/sunrpc/gss_krb5.h>
+#include <linux/sunrpc/xdr.h>
+#include <linux/crypto.h>
+#include <linux/sunrpc/gss_krb5_enctypes.h>
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY RPCDBG_AUTH
+#endif
+
+static struct gss_api_mech gss_kerberos_mech; /* forward declaration */
+
+static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
+ /*
+ * DES (All DES enctypes are mapped to the same gss functionality)
+ */
+ {
+ .etype = ENCTYPE_DES_CBC_RAW,
+ .ctype = CKSUMTYPE_RSA_MD5,
+ .name = "des-cbc-crc",
+ .encrypt_name = "cbc(des)",
+ .cksum_name = "md5",
+ .encrypt = krb5_encrypt,
+ .decrypt = krb5_decrypt,
+ .mk_key = NULL,
+ .signalg = SGN_ALG_DES_MAC_MD5,
+ .sealalg = SEAL_ALG_DES,
+ .keybytes = 7,
+ .keylength = 8,
+ .blocksize = 8,
+ .conflen = 8,
+ .cksumlength = 8,
+ .keyed_cksum = 0,
+ },
+ /*
+ * RC4-HMAC
+ */
+ {
+ .etype = ENCTYPE_ARCFOUR_HMAC,
+ .ctype = CKSUMTYPE_HMAC_MD5_ARCFOUR,
+ .name = "rc4-hmac",
+ .encrypt_name = "ecb(arc4)",
+ .cksum_name = "hmac(md5)",
+ .encrypt = krb5_encrypt,
+ .decrypt = krb5_decrypt,
+ .mk_key = NULL,
+ .signalg = SGN_ALG_HMAC_MD5,
+ .sealalg = SEAL_ALG_MICROSOFT_RC4,
+ .keybytes = 16,
+ .keylength = 16,
+ .blocksize = 1,
+ .conflen = 8,
+ .cksumlength = 8,
+ .keyed_cksum = 1,
+ },
+ /*
+ * 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,
+ .conflen = 8,
+ .cksumlength = 20,
+ .keyed_cksum = 1,
+ },
+ /*
+ * AES128
+ */
+ {
+ .etype = ENCTYPE_AES128_CTS_HMAC_SHA1_96,
+ .ctype = CKSUMTYPE_HMAC_SHA1_96_AES128,
+ .name = "aes128-cts",
+ .encrypt_name = "cts(cbc(aes))",
+ .cksum_name = "hmac(sha1)",
+ .encrypt = krb5_encrypt,
+ .decrypt = krb5_decrypt,
+ .mk_key = gss_krb5_aes_make_key,
+ .encrypt_v2 = gss_krb5_aes_encrypt,
+ .decrypt_v2 = gss_krb5_aes_decrypt,
+ .signalg = -1,
+ .sealalg = -1,
+ .keybytes = 16,
+ .keylength = 16,
+ .blocksize = 16,
+ .conflen = 16,
+ .cksumlength = 12,
+ .keyed_cksum = 1,
+ },
+ /*
+ * AES256
+ */
+ {
+ .etype = ENCTYPE_AES256_CTS_HMAC_SHA1_96,
+ .ctype = CKSUMTYPE_HMAC_SHA1_96_AES256,
+ .name = "aes256-cts",
+ .encrypt_name = "cts(cbc(aes))",
+ .cksum_name = "hmac(sha1)",
+ .encrypt = krb5_encrypt,
+ .decrypt = krb5_decrypt,
+ .mk_key = gss_krb5_aes_make_key,
+ .encrypt_v2 = gss_krb5_aes_encrypt,
+ .decrypt_v2 = gss_krb5_aes_decrypt,
+ .signalg = -1,
+ .sealalg = -1,
+ .keybytes = 32,
+ .keylength = 32,
+ .blocksize = 16,
+ .conflen = 16,
+ .cksumlength = 12,
+ .keyed_cksum = 1,
+ },
+};
+
+static const int num_supported_enctypes =
+ ARRAY_SIZE(supported_gss_krb5_enctypes);
+
+static int
+supported_gss_krb5_enctype(int etype)
+{
+ int i;
+ for (i = 0; i < num_supported_enctypes; i++)
+ if (supported_gss_krb5_enctypes[i].etype == etype)
+ return 1;
+ return 0;
+}
+
+static const struct gss_krb5_enctype *
+get_gss_krb5_enctype(int etype)
+{
+ int i;
+ for (i = 0; i < num_supported_enctypes; i++)
+ if (supported_gss_krb5_enctypes[i].etype == etype)
+ return &supported_gss_krb5_enctypes[i];
+ return NULL;
+}
+
+static const void *
+simple_get_bytes(const void *p, const void *end, void *res, int len)
+{
+ const void *q = (const void *)((const char *)p + len);
+ if (unlikely(q > end || q < p))
+ return ERR_PTR(-EFAULT);
+ memcpy(res, p, len);
+ return q;
+}
+
+static const void *
+simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
+{
+ const void *q;
+ unsigned int len;
+
+ p = simple_get_bytes(p, end, &len, sizeof(len));
+ if (IS_ERR(p))
+ return p;
+ q = (const void *)((const char *)p + len);
+ if (unlikely(q > end || q < p))
+ return ERR_PTR(-EFAULT);
+ res->data = kmemdup(p, len, GFP_NOFS);
+ if (unlikely(res->data == NULL))
+ return ERR_PTR(-ENOMEM);
+ res->len = len;
+ return q;
+}
+
+static inline const void *
+get_key(const void *p, const void *end,
+ struct krb5_ctx *ctx, struct crypto_blkcipher **res)
+{
+ struct xdr_netobj key;
+ int alg;
+
+ p = simple_get_bytes(p, end, &alg, sizeof(alg));
+ if (IS_ERR(p))
+ goto out_err;
+
+ switch (alg) {
+ case ENCTYPE_DES_CBC_CRC:
+ case ENCTYPE_DES_CBC_MD4:
+ case ENCTYPE_DES_CBC_MD5:
+ /* Map all these key types to ENCTYPE_DES_CBC_RAW */
+ alg = ENCTYPE_DES_CBC_RAW;
+ break;
+ }
+
+ if (!supported_gss_krb5_enctype(alg)) {
+ printk(KERN_WARNING "gss_kerberos_mech: unsupported "
+ "encryption key algorithm %d\n", alg);
+ p = ERR_PTR(-EINVAL);
+ goto out_err;
+ }
+ p = simple_get_netobj(p, end, &key);
+ if (IS_ERR(p))
+ goto out_err;
+
+ *res = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
+ CRYPTO_ALG_ASYNC);
+ if (IS_ERR(*res)) {
+ printk(KERN_WARNING "gss_kerberos_mech: unable to initialize "
+ "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
+ *res = NULL;
+ goto out_err_free_key;
+ }
+ if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
+ printk(KERN_WARNING "gss_kerberos_mech: error setting key for "
+ "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
+ goto out_err_free_tfm;
+ }
+
+ kfree(key.data);
+ return p;
+
+out_err_free_tfm:
+ crypto_free_blkcipher(*res);
+out_err_free_key:
+ kfree(key.data);
+ p = ERR_PTR(-EINVAL);
+out_err:
+ return p;
+}
+
+static int
+gss_import_v1_context(const void *p, const void *end, struct krb5_ctx *ctx)
+{
+ int tmp;
+
+ p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
+ if (IS_ERR(p))
+ goto out_err;
+
+ /* Old format supports only DES! Any other enctype uses new format */
+ ctx->enctype = ENCTYPE_DES_CBC_RAW;
+
+ ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
+ if (ctx->gk5e == NULL) {
+ p = ERR_PTR(-EINVAL);
+ goto out_err;
+ }
+
+ /* The downcall format was designed before we completely understood
+ * the uses of the context fields; so it includes some stuff we
+ * just give some minimal sanity-checking, and some we ignore
+ * completely (like the next twenty bytes): */
+ if (unlikely(p + 20 > end || p + 20 < p)) {
+ p = ERR_PTR(-EFAULT);
+ goto out_err;
+ }
+ p += 20;
+ p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
+ if (IS_ERR(p))
+ goto out_err;
+ if (tmp != SGN_ALG_DES_MAC_MD5) {
+ p = ERR_PTR(-ENOSYS);
+ goto out_err;
+ }
+ p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
+ if (IS_ERR(p))
+ goto out_err;
+ if (tmp != SEAL_ALG_DES) {
+ p = ERR_PTR(-ENOSYS);
+ goto out_err;
+ }
+ p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
+ if (IS_ERR(p))
+ goto out_err;
+ p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
+ if (IS_ERR(p))
+ goto out_err;
+ p = simple_get_netobj(p, end, &ctx->mech_used);
+ if (IS_ERR(p))
+ goto out_err;
+ p = get_key(p, end, ctx, &ctx->enc);
+ if (IS_ERR(p))
+ goto out_err_free_mech;
+ p = get_key(p, end, ctx, &ctx->seq);
+ if (IS_ERR(p))
+ goto out_err_free_key1;
+ if (p != end) {
+ p = ERR_PTR(-EFAULT);
+ goto out_err_free_key2;
+ }
+
+ return 0;
+
+out_err_free_key2:
+ crypto_free_blkcipher(ctx->seq);
+out_err_free_key1:
+ crypto_free_blkcipher(ctx->enc);
+out_err_free_mech:
+ kfree(ctx->mech_used.data);
+out_err:
+ return PTR_ERR(p);
+}
+
+static struct crypto_blkcipher *
+context_v2_alloc_cipher(struct krb5_ctx *ctx, const char *cname, u8 *key)
+{
+ struct crypto_blkcipher *cp;
+
+ cp = crypto_alloc_blkcipher(cname, 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(cp)) {
+ dprintk("gss_kerberos_mech: unable to initialize "
+ "crypto algorithm %s\n", cname);
+ return NULL;
+ }
+ if (crypto_blkcipher_setkey(cp, key, ctx->gk5e->keylength)) {
+ dprintk("gss_kerberos_mech: error setting key for "
+ "crypto algorithm %s\n", cname);
+ crypto_free_blkcipher(cp);
+ return NULL;
+ }
+ return cp;
+}
+
+static inline void
+set_cdata(u8 cdata[GSS_KRB5_K5CLENGTH], u32 usage, u8 seed)
+{
+ cdata[0] = (usage>>24)&0xff;
+ cdata[1] = (usage>>16)&0xff;
+ cdata[2] = (usage>>8)&0xff;
+ cdata[3] = usage&0xff;
+ cdata[4] = seed;
+}
+
+static int
+context_derive_keys_des3(struct krb5_ctx *ctx, gfp_t gfp_mask)
+{
+ struct xdr_netobj c, keyin, keyout;
+ u8 cdata[GSS_KRB5_K5CLENGTH];
+ u32 err;
+
+ c.len = GSS_KRB5_K5CLENGTH;
+ c.data = cdata;
+
+ keyin.data = ctx->Ksess;
+ keyin.len = ctx->gk5e->keylength;
+ keyout.len = ctx->gk5e->keylength;
+
+ /* seq uses the raw key */
+ ctx->seq = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
+ ctx->Ksess);
+ if (ctx->seq == NULL)
+ goto out_err;
+
+ ctx->enc = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
+ ctx->Ksess);
+ if (ctx->enc == NULL)
+ goto out_free_seq;
+
+ /* derive cksum */
+ set_cdata(cdata, KG_USAGE_SIGN, KEY_USAGE_SEED_CHECKSUM);
+ keyout.data = ctx->cksum;
+ err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+ if (err) {
+ dprintk("%s: Error %d deriving cksum key\n",
+ __func__, err);
+ goto out_free_enc;
+ }
+
+ return 0;
+
+out_free_enc:
+ crypto_free_blkcipher(ctx->enc);
+out_free_seq:
+ crypto_free_blkcipher(ctx->seq);
+out_err:
+ return -EINVAL;
+}
+
+/*
+ * Note that RC4 depends on deriving keys using the sequence
+ * number or the checksum of a token. Therefore, the final keys
+ * cannot be calculated until the token is being constructed!
+ */
+static int
+context_derive_keys_rc4(struct krb5_ctx *ctx)
+{
+ struct crypto_hash *hmac;
+ char sigkeyconstant[] = "signaturekey";
+ int slen = strlen(sigkeyconstant) + 1; /* include null terminator */
+ struct hash_desc desc;
+ struct scatterlist sg[1];
+ int err;
+
+ dprintk("RPC: %s: entered\n", __func__);
+ /*
+ * derive cksum (aka Ksign) key
+ */
+ hmac = crypto_alloc_hash(ctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(hmac)) {
+ dprintk("%s: error %ld allocating hash '%s'\n",
+ __func__, PTR_ERR(hmac), ctx->gk5e->cksum_name);
+ err = PTR_ERR(hmac);
+ goto out_err;
+ }
+
+ err = crypto_hash_setkey(hmac, ctx->Ksess, ctx->gk5e->keylength);
+ if (err)
+ goto out_err_free_hmac;
+
+ sg_init_table(sg, 1);
+ sg_set_buf(sg, sigkeyconstant, slen);
+
+ desc.tfm = hmac;
+ desc.flags = 0;
+
+ err = crypto_hash_init(&desc);
+ if (err)
+ goto out_err_free_hmac;
+
+ err = crypto_hash_digest(&desc, sg, slen, ctx->cksum);
+ if (err)
+ goto out_err_free_hmac;
+ /*
+ * allocate hash, and blkciphers for data and seqnum encryption
+ */
+ ctx->enc = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
+ CRYPTO_ALG_ASYNC);
+ if (IS_ERR(ctx->enc)) {
+ err = PTR_ERR(ctx->enc);
+ goto out_err_free_hmac;
+ }
+
+ ctx->seq = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
+ CRYPTO_ALG_ASYNC);
+ if (IS_ERR(ctx->seq)) {
+ crypto_free_blkcipher(ctx->enc);
+ err = PTR_ERR(ctx->seq);
+ goto out_err_free_hmac;
+ }
+
+ dprintk("RPC: %s: returning success\n", __func__);
+
+ err = 0;
+
+out_err_free_hmac:
+ crypto_free_hash(hmac);
+out_err:
+ dprintk("RPC: %s: returning %d\n", __func__, err);
+ return err;
+}
+
+static int
+context_derive_keys_new(struct krb5_ctx *ctx, gfp_t gfp_mask)
+{
+ struct xdr_netobj c, keyin, keyout;
+ u8 cdata[GSS_KRB5_K5CLENGTH];
+ u32 err;
+
+ c.len = GSS_KRB5_K5CLENGTH;
+ c.data = cdata;
+
+ keyin.data = ctx->Ksess;
+ keyin.len = ctx->gk5e->keylength;
+ keyout.len = ctx->gk5e->keylength;
+
+ /* initiator seal encryption */
+ set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
+ keyout.data = ctx->initiator_seal;
+ err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+ if (err) {
+ dprintk("%s: Error %d deriving initiator_seal key\n",
+ __func__, err);
+ goto out_err;
+ }
+ ctx->initiator_enc = context_v2_alloc_cipher(ctx,
+ ctx->gk5e->encrypt_name,
+ ctx->initiator_seal);
+ if (ctx->initiator_enc == NULL)
+ goto out_err;
+
+ /* acceptor seal encryption */
+ set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
+ keyout.data = ctx->acceptor_seal;
+ err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+ if (err) {
+ dprintk("%s: Error %d deriving acceptor_seal key\n",
+ __func__, err);
+ goto out_free_initiator_enc;
+ }
+ ctx->acceptor_enc = context_v2_alloc_cipher(ctx,
+ ctx->gk5e->encrypt_name,
+ ctx->acceptor_seal);
+ if (ctx->acceptor_enc == NULL)
+ goto out_free_initiator_enc;
+
+ /* initiator sign checksum */
+ set_cdata(cdata, KG_USAGE_INITIATOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
+ keyout.data = ctx->initiator_sign;
+ err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+ if (err) {
+ dprintk("%s: Error %d deriving initiator_sign key\n",
+ __func__, err);
+ goto out_free_acceptor_enc;
+ }
+
+ /* acceptor sign checksum */
+ set_cdata(cdata, KG_USAGE_ACCEPTOR_SIGN, KEY_USAGE_SEED_CHECKSUM);
+ keyout.data = ctx->acceptor_sign;
+ err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+ if (err) {
+ dprintk("%s: Error %d deriving acceptor_sign key\n",
+ __func__, err);
+ goto out_free_acceptor_enc;
+ }
+
+ /* initiator seal integrity */
+ set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
+ keyout.data = ctx->initiator_integ;
+ err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+ if (err) {
+ dprintk("%s: Error %d deriving initiator_integ key\n",
+ __func__, err);
+ goto out_free_acceptor_enc;
+ }
+
+ /* acceptor seal integrity */
+ set_cdata(cdata, KG_USAGE_ACCEPTOR_SEAL, KEY_USAGE_SEED_INTEGRITY);
+ keyout.data = ctx->acceptor_integ;
+ err = krb5_derive_key(ctx->gk5e, &keyin, &keyout, &c, gfp_mask);
+ if (err) {
+ dprintk("%s: Error %d deriving acceptor_integ key\n",
+ __func__, err);
+ goto out_free_acceptor_enc;
+ }
+
+ switch (ctx->enctype) {
+ case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+ case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+ ctx->initiator_enc_aux =
+ context_v2_alloc_cipher(ctx, "cbc(aes)",
+ ctx->initiator_seal);
+ if (ctx->initiator_enc_aux == NULL)
+ goto out_free_acceptor_enc;
+ ctx->acceptor_enc_aux =
+ context_v2_alloc_cipher(ctx, "cbc(aes)",
+ ctx->acceptor_seal);
+ if (ctx->acceptor_enc_aux == NULL) {
+ crypto_free_blkcipher(ctx->initiator_enc_aux);
+ goto out_free_acceptor_enc;
+ }
+ }
+
+ return 0;
+
+out_free_acceptor_enc:
+ crypto_free_blkcipher(ctx->acceptor_enc);
+out_free_initiator_enc:
+ crypto_free_blkcipher(ctx->initiator_enc);
+out_err:
+ return -EINVAL;
+}
+
+static int
+gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx,
+ gfp_t gfp_mask)
+{
+ int keylen;
+
+ p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags));
+ if (IS_ERR(p))
+ goto out_err;
+ ctx->initiate = ctx->flags & KRB5_CTX_FLAG_INITIATOR;
+
+ p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
+ if (IS_ERR(p))
+ goto out_err;
+ p = simple_get_bytes(p, end, &ctx->seq_send64, sizeof(ctx->seq_send64));
+ if (IS_ERR(p))
+ goto out_err;
+ /* set seq_send for use by "older" enctypes */
+ ctx->seq_send = ctx->seq_send64;
+ if (ctx->seq_send64 != ctx->seq_send) {
+ dprintk("%s: seq_send64 %lx, seq_send %x overflow?\n", __func__,
+ (unsigned long)ctx->seq_send64, ctx->seq_send);
+ p = ERR_PTR(-EINVAL);
+ goto out_err;
+ }
+ 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",
+ ctx->enctype);
+ p = ERR_PTR(-EINVAL);
+ goto out_err;
+ }
+ keylen = ctx->gk5e->keylength;
+
+ p = simple_get_bytes(p, end, ctx->Ksess, keylen);
+ if (IS_ERR(p))
+ goto out_err;
+
+ if (p != end) {
+ p = ERR_PTR(-EINVAL);
+ goto out_err;
+ }
+
+ ctx->mech_used.data = kmemdup(gss_kerberos_mech.gm_oid.data,
+ gss_kerberos_mech.gm_oid.len, gfp_mask);
+ if (unlikely(ctx->mech_used.data == NULL)) {
+ p = ERR_PTR(-ENOMEM);
+ goto out_err;
+ }
+ ctx->mech_used.len = gss_kerberos_mech.gm_oid.len;
+
+ switch (ctx->enctype) {
+ case ENCTYPE_DES3_CBC_RAW:
+ return context_derive_keys_des3(ctx, gfp_mask);
+ case ENCTYPE_ARCFOUR_HMAC:
+ return context_derive_keys_rc4(ctx);
+ case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+ case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+ return context_derive_keys_new(ctx, gfp_mask);
+ default:
+ return -EINVAL;
+ }
+
+out_err:
+ return PTR_ERR(p);
+}
+
+static int
+gss_import_sec_context_kerberos(const void *p, size_t len,
+ struct gss_ctx *ctx_id,
+ time_t *endtime,
+ gfp_t gfp_mask)
+{
+ const void *end = (const void *)((const char *)p + len);
+ struct krb5_ctx *ctx;
+ int ret;
+
+ ctx = kzalloc(sizeof(*ctx), gfp_mask);
+ if (ctx == NULL)
+ return -ENOMEM;
+
+ if (len == 85)
+ ret = gss_import_v1_context(p, end, ctx);
+ else
+ ret = gss_import_v2_context(p, end, ctx, gfp_mask);
+
+ if (ret == 0) {
+ ctx_id->internal_ctx_id = ctx;
+ if (endtime)
+ *endtime = ctx->endtime;
+ } else
+ kfree(ctx);
+
+ dprintk("RPC: %s: returning %d\n", __func__, ret);
+ return ret;
+}
+
+static void
+gss_delete_sec_context_kerberos(void *internal_ctx) {
+ struct krb5_ctx *kctx = internal_ctx;
+
+ crypto_free_blkcipher(kctx->seq);
+ crypto_free_blkcipher(kctx->enc);
+ crypto_free_blkcipher(kctx->acceptor_enc);
+ crypto_free_blkcipher(kctx->initiator_enc);
+ crypto_free_blkcipher(kctx->acceptor_enc_aux);
+ crypto_free_blkcipher(kctx->initiator_enc_aux);
+ kfree(kctx->mech_used.data);
+ kfree(kctx);
+}
+
+static const struct gss_api_ops gss_kerberos_ops = {
+ .gss_import_sec_context = gss_import_sec_context_kerberos,
+ .gss_get_mic = gss_get_mic_kerberos,
+ .gss_verify_mic = gss_verify_mic_kerberos,
+ .gss_wrap = gss_wrap_kerberos,
+ .gss_unwrap = gss_unwrap_kerberos,
+ .gss_delete_sec_context = gss_delete_sec_context_kerberos,
+};
+
+static struct pf_desc gss_kerberos_pfs[] = {
+ [0] = {
+ .pseudoflavor = RPC_AUTH_GSS_KRB5,
+ .qop = GSS_C_QOP_DEFAULT,
+ .service = RPC_GSS_SVC_NONE,
+ .name = "krb5",
+ },
+ [1] = {
+ .pseudoflavor = RPC_AUTH_GSS_KRB5I,
+ .qop = GSS_C_QOP_DEFAULT,
+ .service = RPC_GSS_SVC_INTEGRITY,
+ .name = "krb5i",
+ },
+ [2] = {
+ .pseudoflavor = RPC_AUTH_GSS_KRB5P,
+ .qop = GSS_C_QOP_DEFAULT,
+ .service = RPC_GSS_SVC_PRIVACY,
+ .name = "krb5p",
+ },
+};
+
+MODULE_ALIAS("rpc-auth-gss-krb5");
+MODULE_ALIAS("rpc-auth-gss-krb5i");
+MODULE_ALIAS("rpc-auth-gss-krb5p");
+MODULE_ALIAS("rpc-auth-gss-390003");
+MODULE_ALIAS("rpc-auth-gss-390004");
+MODULE_ALIAS("rpc-auth-gss-390005");
+MODULE_ALIAS("rpc-auth-gss-1.2.840.113554.1.2.2");
+
+static struct gss_api_mech gss_kerberos_mech = {
+ .gm_name = "krb5",
+ .gm_owner = THIS_MODULE,
+ .gm_oid = { 9, "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" },
+ .gm_ops = &gss_kerberos_ops,
+ .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
+ .gm_pfs = gss_kerberos_pfs,
+ .gm_upcall_enctypes = KRB5_SUPPORTED_ENCTYPES,
+};
+
+static int __init init_kerberos_module(void)
+{
+ int status;
+
+ status = gss_mech_register(&gss_kerberos_mech);
+ if (status)
+ printk("Failed to register kerberos gss mechanism!\n");
+ return status;
+}
+
+static void __exit cleanup_kerberos_module(void)
+{
+ gss_mech_unregister(&gss_kerberos_mech);
+}
+
+MODULE_LICENSE("GPL");
+module_init(init_kerberos_module);
+module_exit(cleanup_kerberos_module);
Code Review / kvmfornfv.git / blobdiff