/*
* linux/net/sunrpc/gss_krb5_mech.c
*
- * Copyright (c) 2001 The Regents of the University of Michigan.
+ * Copyright (c) 2001-2008 The Regents of the University of Michigan.
* All rights reserved.
*
* Andy Adamson <andros@umich.edu>
# 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,
+ .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 =
+ 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)
{
q = (const void *)((const char *)p + len);
if (unlikely(q > end || q < p))
return ERR_PTR(-EFAULT);
- res->data = kmemdup(p, len, GFP_KERNEL);
+ res->data = kmemdup(p, len, GFP_NOFS);
if (unlikely(res->data == NULL))
return ERR_PTR(-ENOMEM);
res->len = len;
}
static inline const void *
-get_key(const void *p, const void *end, struct crypto_blkcipher **res)
+get_key(const void *p, const void *end,
+ struct krb5_ctx *ctx, struct crypto_blkcipher **res)
{
struct xdr_netobj key;
int alg;
- char *alg_name;
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);
+ goto out_err;
+ }
p = simple_get_netobj(p, end, &key);
if (IS_ERR(p))
goto out_err;
- switch (alg) {
- case ENCTYPE_DES_CBC_RAW:
- alg_name = "cbc(des)";
- break;
- default:
- printk("gss_kerberos_mech: unsupported algorithm %d\n", alg);
- goto out_err_free_key;
- }
- *res = crypto_alloc_blkcipher(alg_name, 0, CRYPTO_ALG_ASYNC);
+ *res = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
+ CRYPTO_ALG_ASYNC);
if (IS_ERR(*res)) {
- printk("gss_kerberos_mech: unable to initialize crypto algorithm %s\n", alg_name);
+ 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("gss_kerberos_mech: error setting key for crypto algorithm %s\n", alg_name);
+ printk(KERN_WARNING "gss_kerberos_mech: error setting key for "
+ "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
goto out_err_free_tfm;
}
}
static int
-gss_import_sec_context_kerberos(const void *p,
- size_t len,
- struct gss_ctx *ctx_id)
+gss_import_v1_context(const void *p, const void *end, struct krb5_ctx *ctx)
{
- const void *end = (const void *)((const char *)p + len);
- struct krb5_ctx *ctx;
int tmp;
- if (!(ctx = kzalloc(sizeof(*ctx), GFP_KERNEL)))
- goto out_err;
-
p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
if (IS_ERR(p))
- goto out_err_free_ctx;
+ 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)
+ 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))
- goto out_err_free_ctx;
+ goto out_err;
p += 20;
p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
if (IS_ERR(p))
- goto out_err_free_ctx;
- if (tmp != SGN_ALG_DES_MAC_MD5)
- goto out_err_free_ctx;
+ 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_free_ctx;
- if (tmp != SEAL_ALG_DES)
- goto out_err_free_ctx;
+ 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_free_ctx;
+ goto out_err;
p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
if (IS_ERR(p))
- goto out_err_free_ctx;
+ goto out_err;
p = simple_get_netobj(p, end, &ctx->mech_used);
if (IS_ERR(p))
- goto out_err_free_ctx;
- p = get_key(p, end, &ctx->enc);
+ 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->seq);
+ p = get_key(p, end, ctx, &ctx->seq);
if (IS_ERR(p))
goto out_err_free_key1;
if (p != end) {
goto out_err_free_key2;
}
- ctx_id->internal_ctx_id = ctx;
-
- dprintk("RPC: Successfully imported new context.\n");
return 0;
out_err_free_key2:
crypto_free_blkcipher(ctx->enc);
out_err_free_mech:
kfree(ctx->mech_used.data);
-out_err_free_ctx:
- kfree(ctx);
out_err:
return PTR_ERR(p);
}
+struct crypto_blkcipher *
+context_v2_alloc_cipher(struct krb5_ctx *ctx, u8 *key)
+{
+ struct crypto_blkcipher *cp;
+
+ cp = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name,
+ 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(cp)) {
+ dprintk("gss_kerberos_mech: unable to initialize "
+ "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
+ return NULL;
+ }
+ if (crypto_blkcipher_setkey(cp, key, ctx->gk5e->keylength)) {
+ dprintk("gss_kerberos_mech: error setting key for "
+ "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
+ 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, u8 *rawkey, u32 keylen)
+{
+ struct xdr_netobj c, keyin, keyout;
+ u8 cdata[GSS_KRB5_K5CLENGTH];
+ u32 err;
+
+ c.len = GSS_KRB5_K5CLENGTH;
+ c.data = cdata;
+
+ keyin.data = rawkey;
+ keyin.len = keylen;
+ keyout.len = keylen;
+
+ /* seq uses the raw key */
+ ctx->seq = context_v2_alloc_cipher(ctx, rawkey);
+ if (ctx->seq == NULL)
+ goto out_err;
+
+ ctx->enc = context_v2_alloc_cipher(ctx, rawkey);
+ 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);
+ 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;
+}
+
+static int
+context_derive_keys_new(struct krb5_ctx *ctx, u8 *rawkey, u32 keylen)
+{
+ struct xdr_netobj c, keyin, keyout;
+ u8 cdata[GSS_KRB5_K5CLENGTH];
+ u32 err;
+
+ c.len = GSS_KRB5_K5CLENGTH;
+ c.data = cdata;
+
+ keyin.data = rawkey;
+ keyin.len = keylen;
+ keyout.len = keylen;
+
+ /* 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);
+ 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->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);
+ 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->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);
+ 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);
+ 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);
+ 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);
+ if (err) {
+ dprintk("%s: Error %d deriving acceptor_integ key\n",
+ __func__, err);
+ 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)
+{
+ u8 rawkey[GSS_KRB5_MAX_KEYLEN];
+ 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__,
+ (long unsigned)ctx->seq_send64, ctx->seq_send);
+ 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, rawkey, 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_KERNEL);
+ 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, rawkey, keylen);
+ case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+ case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+ return context_derive_keys_new(ctx, rawkey, keylen);
+ 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)
+{
+ const void *end = (const void *)((const char *)p + len);
+ struct krb5_ctx *ctx;
+ int ret;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ 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);
+
+ if (ret == 0)
+ ctx_id->internal_ctx_id = ctx;
+ 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);
kfree(kctx->mech_used.data);
kfree(kctx);
}
-static struct gss_api_ops gss_kerberos_ops = {
+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,
static struct gss_api_mech gss_kerberos_mech = {
.gm_name = "krb5",
.gm_owner = THIS_MODULE,
+ .gm_oid = {9, (void *)"\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 = "enctypes=3,1,2 ",
};
static int __init init_kerberos_module(void)
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff