/*
* linux/net/sunrpc/gss_krb5_crypto.c
*
- * Copyright (c) 2000 The Regents of the University of Michigan.
+ * Copyright (c) 2000-2008 The Regents of the University of Michigan.
* All rights reserved.
*
* Andy Adamson <andros@umich.edu>
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
+#include <linux/err.h>
#include <linux/types.h>
#include <linux/mm.h>
-#include <linux/slab.h>
#include <linux/scatterlist.h>
#include <linux/crypto.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/sunrpc/gss_krb5.h>
+#include <linux/sunrpc/xdr.h>
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_AUTH
u32
krb5_encrypt(
- struct crypto_tfm *tfm,
+ struct crypto_blkcipher *tfm,
void * iv,
void * in,
void * out,
int length)
{
u32 ret = -EINVAL;
- struct scatterlist sg[1];
- u8 local_iv[16] = {0};
-
- dprintk("RPC: krb5_encrypt: input data:\n");
- print_hexl((u32 *)in, length, 0);
+ struct scatterlist sg[1];
+ u8 local_iv[GSS_KRB5_MAX_BLOCKSIZE] = {0};
+ struct blkcipher_desc desc = { .tfm = tfm, .info = local_iv };
- if (length % crypto_tfm_alg_blocksize(tfm) != 0)
+ if (length % crypto_blkcipher_blocksize(tfm) != 0)
goto out;
- if (crypto_tfm_alg_ivsize(tfm) > 16) {
- dprintk("RPC: gss_k5encrypt: tfm iv size to large %d\n",
- crypto_tfm_alg_ivsize(tfm));
+ if (crypto_blkcipher_ivsize(tfm) > GSS_KRB5_MAX_BLOCKSIZE) {
+ dprintk("RPC: gss_k5encrypt: tfm iv size too large %d\n",
+ crypto_blkcipher_ivsize(tfm));
goto out;
}
if (iv)
- memcpy(local_iv, iv, crypto_tfm_alg_ivsize(tfm));
+ memcpy(local_iv, iv, crypto_blkcipher_ivsize(tfm));
memcpy(out, in, length);
- sg_set_buf(sg, out, length);
-
- ret = crypto_cipher_encrypt_iv(tfm, sg, sg, length, local_iv);
+ sg_init_one(sg, out, length);
- dprintk("RPC: krb5_encrypt: output data:\n");
- print_hexl((u32 *)out, length, 0);
+ ret = crypto_blkcipher_encrypt_iv(&desc, sg, sg, length);
out:
- dprintk("RPC: krb5_encrypt returns %d\n",ret);
- return(ret);
+ dprintk("RPC: krb5_encrypt returns %d\n", ret);
+ return ret;
}
-EXPORT_SYMBOL(krb5_encrypt);
-
u32
krb5_decrypt(
- struct crypto_tfm *tfm,
+ struct crypto_blkcipher *tfm,
void * iv,
void * in,
void * out,
{
u32 ret = -EINVAL;
struct scatterlist sg[1];
- u8 local_iv[16] = {0};
+ u8 local_iv[GSS_KRB5_MAX_BLOCKSIZE] = {0};
+ struct blkcipher_desc desc = { .tfm = tfm, .info = local_iv };
- dprintk("RPC: krb5_decrypt: input data:\n");
- print_hexl((u32 *)in, length, 0);
-
- if (length % crypto_tfm_alg_blocksize(tfm) != 0)
+ if (length % crypto_blkcipher_blocksize(tfm) != 0)
goto out;
- if (crypto_tfm_alg_ivsize(tfm) > 16) {
- dprintk("RPC: gss_k5decrypt: tfm iv size to large %d\n",
- crypto_tfm_alg_ivsize(tfm));
+ if (crypto_blkcipher_ivsize(tfm) > GSS_KRB5_MAX_BLOCKSIZE) {
+ dprintk("RPC: gss_k5decrypt: tfm iv size too large %d\n",
+ crypto_blkcipher_ivsize(tfm));
goto out;
}
if (iv)
- memcpy(local_iv,iv, crypto_tfm_alg_ivsize(tfm));
+ memcpy(local_iv,iv, crypto_blkcipher_ivsize(tfm));
memcpy(out, in, length);
- sg_set_buf(sg, out, length);
-
- ret = crypto_cipher_decrypt_iv(tfm, sg, sg, length, local_iv);
-
- dprintk("RPC: krb5_decrypt: output_data:\n");
- print_hexl((u32 *)out, length, 0);
-out:
- dprintk("RPC: gss_k5decrypt returns %d\n",ret);
- return(ret);
-}
-
-EXPORT_SYMBOL(krb5_decrypt);
-
-static int
-process_xdr_buf(struct xdr_buf *buf, int offset, int len,
- int (*actor)(struct scatterlist *, void *), void *data)
-{
- int i, page_len, thislen, page_offset, ret = 0;
- struct scatterlist sg[1];
-
- if (offset >= buf->head[0].iov_len) {
- offset -= buf->head[0].iov_len;
- } else {
- thislen = buf->head[0].iov_len - offset;
- if (thislen > len)
- thislen = len;
- sg_set_buf(sg, buf->head[0].iov_base + offset, thislen);
- ret = actor(sg, data);
- if (ret)
- goto out;
- offset = 0;
- len -= thislen;
- }
- if (len == 0)
- goto out;
-
- if (offset >= buf->page_len) {
- offset -= buf->page_len;
- } else {
- page_len = buf->page_len - offset;
- if (page_len > len)
- page_len = len;
- len -= page_len;
- page_offset = (offset + buf->page_base) & (PAGE_CACHE_SIZE - 1);
- i = (offset + buf->page_base) >> PAGE_CACHE_SHIFT;
- thislen = PAGE_CACHE_SIZE - page_offset;
- do {
- if (thislen > page_len)
- thislen = page_len;
- sg->page = buf->pages[i];
- sg->offset = page_offset;
- sg->length = thislen;
- ret = actor(sg, data);
- if (ret)
- goto out;
- page_len -= thislen;
- i++;
- page_offset = 0;
- thislen = PAGE_CACHE_SIZE;
- } while (page_len != 0);
- offset = 0;
- }
- if (len == 0)
- goto out;
+ sg_init_one(sg, out, length);
- if (offset < buf->tail[0].iov_len) {
- thislen = buf->tail[0].iov_len - offset;
- if (thislen > len)
- thislen = len;
- sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen);
- ret = actor(sg, data);
- len -= thislen;
- }
- if (len != 0)
- ret = -EINVAL;
+ ret = crypto_blkcipher_decrypt_iv(&desc, sg, sg, length);
out:
+ dprintk("RPC: gss_k5decrypt returns %d\n",ret);
return ret;
}
static int
checksummer(struct scatterlist *sg, void *data)
{
- struct crypto_tfm *tfm = (struct crypto_tfm *)data;
-
- crypto_digest_update(tfm, sg, 1);
+ struct hash_desc *desc = data;
- return 0;
+ return crypto_hash_update(desc, sg, sg->length);
}
-/* checksum the plaintext data and hdrlen bytes of the token header */
-s32
-make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body,
- int body_offset, struct xdr_netobj *cksum)
+/*
+ * checksum the plaintext data and hdrlen bytes of the token header
+ * The checksum is performed over the first 8 bytes of the
+ * gss token header and then over the data body
+ */
+u32
+make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
+ struct xdr_buf *body, int body_offset, u8 *cksumkey,
+ struct xdr_netobj *cksumout)
{
- char *cksumname;
- struct crypto_tfm *tfm = NULL; /* XXX add to ctx? */
+ struct hash_desc desc;
struct scatterlist sg[1];
+ int err;
+ u8 checksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+ unsigned int checksumlen;
- switch (cksumtype) {
- case CKSUMTYPE_RSA_MD5:
- cksumname = "md5";
- break;
- default:
- dprintk("RPC: krb5_make_checksum:"
- " unsupported checksum %d", cksumtype);
- return GSS_S_FAILURE;
+ if (cksumout->len < kctx->gk5e->cksumlength) {
+ dprintk("%s: checksum buffer length, %u, too small for %s\n",
+ __func__, cksumout->len, kctx->gk5e->name);
+ return GSS_S_FAILURE;
}
- if (!(tfm = crypto_alloc_tfm(cksumname, CRYPTO_TFM_REQ_MAY_SLEEP)))
+
+ desc.tfm = crypto_alloc_hash(kctx->gk5e->cksum_name, 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(desc.tfm))
return GSS_S_FAILURE;
- cksum->len = crypto_tfm_alg_digestsize(tfm);
-
- crypto_digest_init(tfm);
- sg_set_buf(sg, header, hdrlen);
- crypto_digest_update(tfm, sg, 1);
- process_xdr_buf(body, body_offset, body->len - body_offset,
- checksummer, tfm);
- crypto_digest_final(tfm, cksum->data);
- crypto_free_tfm(tfm);
- return 0;
-}
+ desc.flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ checksumlen = crypto_hash_digestsize(desc.tfm);
+
+ if (cksumkey != NULL) {
+ err = crypto_hash_setkey(desc.tfm, cksumkey,
+ kctx->gk5e->keylength);
+ if (err)
+ goto out;
+ }
-EXPORT_SYMBOL(make_checksum);
+ err = crypto_hash_init(&desc);
+ if (err)
+ goto out;
+ sg_init_one(sg, header, hdrlen);
+ err = crypto_hash_update(&desc, sg, hdrlen);
+ if (err)
+ goto out;
+ err = xdr_process_buf(body, body_offset, body->len - body_offset,
+ checksummer, &desc);
+ if (err)
+ goto out;
+ err = crypto_hash_final(&desc, checksumdata);
+ if (err)
+ goto out;
+
+ switch (kctx->gk5e->ctype) {
+ case CKSUMTYPE_RSA_MD5:
+ err = kctx->gk5e->encrypt(kctx->seq, NULL, checksumdata,
+ checksumdata, checksumlen);
+ if (err)
+ goto out;
+ memcpy(cksumout->data,
+ 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;
+ }
+ cksumout->len = kctx->gk5e->cksumlength;
+out:
+ crypto_free_hash(desc.tfm);
+ return err ? GSS_S_FAILURE : 0;
+}
struct encryptor_desc {
- u8 iv[8]; /* XXX hard-coded blocksize */
- struct crypto_tfm *tfm;
+ u8 iv[GSS_KRB5_MAX_BLOCKSIZE];
+ struct blkcipher_desc desc;
int pos;
struct xdr_buf *outbuf;
struct page **pages;
/* Worst case is 4 fragments: head, end of page 1, start
* of page 2, tail. Anything more is a bug. */
BUG_ON(desc->fragno > 3);
- desc->infrags[desc->fragno] = *sg;
- desc->outfrags[desc->fragno] = *sg;
page_pos = desc->pos - outbuf->head[0].iov_len;
if (page_pos >= 0 && page_pos < outbuf->page_len) {
int i = (page_pos + outbuf->page_base) >> PAGE_CACHE_SHIFT;
in_page = desc->pages[i];
} else {
- in_page = sg->page;
+ in_page = sg_page(sg);
}
- desc->infrags[desc->fragno].page = in_page;
+ sg_set_page(&desc->infrags[desc->fragno], in_page, sg->length,
+ sg->offset);
+ sg_set_page(&desc->outfrags[desc->fragno], sg_page(sg), sg->length,
+ sg->offset);
desc->fragno++;
desc->fraglen += sg->length;
desc->pos += sg->length;
- fraglen = thislen & 7; /* XXX hardcoded blocksize */
+ fraglen = thislen & (crypto_blkcipher_blocksize(desc->desc.tfm) - 1);
thislen -= fraglen;
if (thislen == 0)
return 0;
- ret = crypto_cipher_encrypt_iv(desc->tfm, desc->outfrags, desc->infrags,
- thislen, desc->iv);
+ sg_mark_end(&desc->infrags[desc->fragno - 1]);
+ sg_mark_end(&desc->outfrags[desc->fragno - 1]);
+
+ ret = crypto_blkcipher_encrypt_iv(&desc->desc, desc->outfrags,
+ desc->infrags, thislen);
if (ret)
return ret;
+
+ sg_init_table(desc->infrags, 4);
+ sg_init_table(desc->outfrags, 4);
+
if (fraglen) {
- desc->outfrags[0].page = sg->page;
- desc->outfrags[0].offset = sg->offset + sg->length - fraglen;
- desc->outfrags[0].length = fraglen;
+ sg_set_page(&desc->outfrags[0], sg_page(sg), fraglen,
+ sg->offset + sg->length - fraglen);
desc->infrags[0] = desc->outfrags[0];
- desc->infrags[0].page = in_page;
+ sg_assign_page(&desc->infrags[0], in_page);
desc->fragno = 1;
desc->fraglen = fraglen;
} else {
}
int
-gss_encrypt_xdr_buf(struct crypto_tfm *tfm, struct xdr_buf *buf, int offset,
- struct page **pages)
+gss_encrypt_xdr_buf(struct crypto_blkcipher *tfm, struct xdr_buf *buf,
+ int offset, struct page **pages)
{
int ret;
struct encryptor_desc desc;
- BUG_ON((buf->len - offset) % crypto_tfm_alg_blocksize(tfm) != 0);
+ BUG_ON((buf->len - offset) % crypto_blkcipher_blocksize(tfm) != 0);
memset(desc.iv, 0, sizeof(desc.iv));
- desc.tfm = tfm;
+ desc.desc.tfm = tfm;
+ desc.desc.info = desc.iv;
+ desc.desc.flags = 0;
desc.pos = offset;
desc.outbuf = buf;
desc.pages = pages;
desc.fragno = 0;
desc.fraglen = 0;
- ret = process_xdr_buf(buf, offset, buf->len - offset, encryptor, &desc);
+ sg_init_table(desc.infrags, 4);
+ sg_init_table(desc.outfrags, 4);
+
+ ret = xdr_process_buf(buf, offset, buf->len - offset, encryptor, &desc);
return ret;
}
-EXPORT_SYMBOL(gss_encrypt_xdr_buf);
-
struct decryptor_desc {
- u8 iv[8]; /* XXX hard-coded blocksize */
- struct crypto_tfm *tfm;
+ u8 iv[GSS_KRB5_MAX_BLOCKSIZE];
+ struct blkcipher_desc desc;
struct scatterlist frags[4];
int fragno;
int fraglen;
/* Worst case is 4 fragments: head, end of page 1, start
* of page 2, tail. Anything more is a bug. */
BUG_ON(desc->fragno > 3);
- desc->frags[desc->fragno] = *sg;
+ sg_set_page(&desc->frags[desc->fragno], sg_page(sg), sg->length,
+ sg->offset);
desc->fragno++;
desc->fraglen += sg->length;
- fraglen = thislen & 7; /* XXX hardcoded blocksize */
+ fraglen = thislen & (crypto_blkcipher_blocksize(desc->desc.tfm) - 1);
thislen -= fraglen;
if (thislen == 0)
return 0;
- ret = crypto_cipher_decrypt_iv(desc->tfm, desc->frags, desc->frags,
- thislen, desc->iv);
+ sg_mark_end(&desc->frags[desc->fragno - 1]);
+
+ ret = crypto_blkcipher_decrypt_iv(&desc->desc, desc->frags,
+ desc->frags, thislen);
if (ret)
return ret;
+
+ sg_init_table(desc->frags, 4);
+
if (fraglen) {
- desc->frags[0].page = sg->page;
- desc->frags[0].offset = sg->offset + sg->length - fraglen;
- desc->frags[0].length = fraglen;
+ sg_set_page(&desc->frags[0], sg_page(sg), fraglen,
+ sg->offset + sg->length - fraglen);
desc->fragno = 1;
desc->fraglen = fraglen;
} else {
}
int
-gss_decrypt_xdr_buf(struct crypto_tfm *tfm, struct xdr_buf *buf, int offset)
+gss_decrypt_xdr_buf(struct crypto_blkcipher *tfm, struct xdr_buf *buf,
+ int offset)
{
struct decryptor_desc desc;
/* XXXJBF: */
- BUG_ON((buf->len - offset) % crypto_tfm_alg_blocksize(tfm) != 0);
+ BUG_ON((buf->len - offset) % crypto_blkcipher_blocksize(tfm) != 0);
memset(desc.iv, 0, sizeof(desc.iv));
- desc.tfm = tfm;
+ desc.desc.tfm = tfm;
+ desc.desc.info = desc.iv;
+ desc.desc.flags = 0;
desc.fragno = 0;
desc.fraglen = 0;
- return process_xdr_buf(buf, offset, buf->len - offset, decryptor, &desc);
+
+ sg_init_table(desc.frags, 4);
+
+ return xdr_process_buf(buf, offset, buf->len - offset, decryptor, &desc);
}
-EXPORT_SYMBOL(gss_decrypt_xdr_buf);
+/*
+ * This function makes the assumption that it was ultimately called
+ * from gss_wrap().
+ *
+ * The client auth_gss code moves any existing tail data into a
+ * separate page before calling gss_wrap.
+ * The server svcauth_gss code ensures that both the head and the
+ * tail have slack space of RPC_MAX_AUTH_SIZE before calling gss_wrap.
+ *
+ * Even with that guarantee, this function may be called more than
+ * once in the processing of gss_wrap(). The best we can do is
+ * verify at compile-time (see GSS_KRB5_SLACK_CHECK) that the
+ * largest expected shift will fit within RPC_MAX_AUTH_SIZE.
+ * At run-time we can verify that a single invocation of this
+ * function doesn't attempt to use more the RPC_MAX_AUTH_SIZE.
+ */
+
+int
+xdr_extend_head(struct xdr_buf *buf, unsigned int base, unsigned int shiftlen)
+{
+ u8 *p;
+
+ if (shiftlen == 0)
+ return 0;
+
+ BUILD_BUG_ON(GSS_KRB5_MAX_SLACK_NEEDED > RPC_MAX_AUTH_SIZE);
+ BUG_ON(shiftlen > RPC_MAX_AUTH_SIZE);
+
+ p = buf->head[0].iov_base + base;
+
+ memmove(p + shiftlen, p, buf->head[0].iov_len - base);
+
+ buf->head[0].iov_len += shiftlen;
+ buf->len += shiftlen;
+
+ return 0;
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff