| /* |
| * 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 <crypto/hash.h> |
| #include <crypto/skcipher.h> |
| #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/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_skcipher **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_skcipher(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_skcipher_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_skcipher(*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_skcipher(ctx->seq); |
| out_err_free_key1: |
| crypto_free_skcipher(ctx->enc); |
| out_err_free_mech: |
| kfree(ctx->mech_used.data); |
| out_err: |
| return PTR_ERR(p); |
| } |
| |
| static struct crypto_skcipher * |
| context_v2_alloc_cipher(struct krb5_ctx *ctx, const char *cname, u8 *key) |
| { |
| struct crypto_skcipher *cp; |
| |
| cp = crypto_alloc_skcipher(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_skcipher_setkey(cp, key, ctx->gk5e->keylength)) { |
| dprintk("gss_kerberos_mech: error setting key for " |
| "crypto algorithm %s\n", cname); |
| crypto_free_skcipher(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_skcipher(ctx->enc); |
| out_free_seq: |
| crypto_free_skcipher(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_shash *hmac; |
| char sigkeyconstant[] = "signaturekey"; |
| int slen = strlen(sigkeyconstant) + 1; /* include null terminator */ |
| struct shash_desc *desc; |
| int err; |
| |
| dprintk("RPC: %s: entered\n", __func__); |
| /* |
| * derive cksum (aka Ksign) key |
| */ |
| hmac = crypto_alloc_shash(ctx->gk5e->cksum_name, 0, 0); |
| 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_shash_setkey(hmac, ctx->Ksess, ctx->gk5e->keylength); |
| if (err) |
| goto out_err_free_hmac; |
| |
| |
| desc = kmalloc(sizeof(*desc), GFP_KERNEL); |
| if (!desc) { |
| dprintk("%s: failed to allocate hash descriptor for '%s'\n", |
| __func__, ctx->gk5e->cksum_name); |
| err = -ENOMEM; |
| goto out_err_free_hmac; |
| } |
| |
| desc->tfm = hmac; |
| desc->flags = 0; |
| |
| err = crypto_shash_digest(desc, sigkeyconstant, slen, ctx->cksum); |
| kzfree(desc); |
| if (err) |
| goto out_err_free_hmac; |
| /* |
| * allocate hash, and skciphers for data and seqnum encryption |
| */ |
| ctx->enc = crypto_alloc_skcipher(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_skcipher(ctx->gk5e->encrypt_name, 0, |
| CRYPTO_ALG_ASYNC); |
| if (IS_ERR(ctx->seq)) { |
| crypto_free_skcipher(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_shash(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_skcipher(ctx->initiator_enc_aux); |
| goto out_free_acceptor_enc; |
| } |
| } |
| |
| return 0; |
| |
| out_free_acceptor_enc: |
| crypto_free_skcipher(ctx->acceptor_enc); |
| out_free_initiator_enc: |
| crypto_free_skcipher(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_skcipher(kctx->seq); |
| crypto_free_skcipher(kctx->enc); |
| crypto_free_skcipher(kctx->acceptor_enc); |
| crypto_free_skcipher(kctx->initiator_enc); |
| crypto_free_skcipher(kctx->acceptor_enc_aux); |
| crypto_free_skcipher(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); |