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RPCSEC_GSS: krb5 pre-privacy cleanup

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The code this was originally derived from processed wrap and mic tokens using
 the same functions.  This required some contortions, and more would be required
 with the addition of xdr_buf's, so it's better to separate out the two code
 paths.

 In preparation for adding privacy support, remove the last vestiges of the
 old wrap token code.

 Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
J. Bruce Fields 2005-10-13 16:55:08 -04:00 committed by Trond Myklebust
parent f7b3af64c6
commit bfa91516b5
4 changed files with 16 additions and 62 deletions
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5
include/linux/sunrpc/gss_krb5.h
View File

@ -121,13 +121,12 @@ make_checksum(s32 cksumtype, char *header, int hdrlen, struct xdr_buf *body,
u32
krb5_make_token(struct krb5_ctx *context_handle, int qop_req,
struct xdr_buf *input_message_buffer,
struct xdr_netobj *output_message_buffer, int toktype);
struct xdr_netobj *output_message_buffer);
u32
krb5_read_token(struct krb5_ctx *context_handle,
struct xdr_netobj *input_token_buffer,
struct xdr_buf *message_buffer,
int *qop_state, int toktype);
struct xdr_buf *message_buffer, int *qop_state);
u32
krb5_encrypt(struct crypto_tfm * key,

5
net/sunrpc/auth_gss/gss_krb5_mech.c
View File

@ -199,8 +199,7 @@ gss_verify_mic_kerberos(struct gss_ctx *ctx,
int qop_state;
struct krb5_ctx *kctx = ctx->internal_ctx_id;
maj_stat = krb5_read_token(kctx, mic_token, message, &qop_state,
KG_TOK_MIC_MSG);
maj_stat = krb5_read_token(kctx, mic_token, message, &qop_state);
if (!maj_stat && qop_state)
*qstate = qop_state;
@ -216,7 +215,7 @@ gss_get_mic_kerberos(struct gss_ctx *ctx,
u32 err = 0;
struct krb5_ctx *kctx = ctx->internal_ctx_id;
err = krb5_make_token(kctx, qop, message, mic_token, KG_TOK_MIC_MSG);
err = krb5_make_token(kctx, qop, message, mic_token);
dprintk("RPC: gss_get_mic_kerberos returning %d\n",err);

38
net/sunrpc/auth_gss/gss_krb5_seal.c
View File

@ -70,22 +70,12 @@
# define RPCDBG_FACILITY RPCDBG_AUTH
#endif
static inline int
gss_krb5_padding(int blocksize, int length) {
/* Most of the code is block-size independent but in practice we
* use only 8: */
BUG_ON(blocksize != 8);
return 8 - (length & 7);
}
u32
krb5_make_token(struct krb5_ctx *ctx, int qop_req,
struct xdr_buf *text, struct xdr_netobj *token,
int toktype)
struct xdr_buf *text, struct xdr_netobj *token)
{
s32 checksum_type;
struct xdr_netobj md5cksum = {.len = 0, .data = NULL};
int blocksize = 0, tmsglen;
unsigned char *ptr, *krb5_hdr, *msg_start;
s32 now;
@ -111,21 +101,13 @@ krb5_make_token(struct krb5_ctx *ctx, int qop_req,
goto out_err;
}
if (toktype == KG_TOK_WRAP_MSG) {
blocksize = crypto_tfm_alg_blocksize(ctx->enc);
tmsglen = blocksize + text->len
+ gss_krb5_padding(blocksize, blocksize + text->len);
} else {
tmsglen = 0;
}
token->len = g_token_size(&ctx->mech_used, 22 + tmsglen);
token->len = g_token_size(&ctx->mech_used, 22);
ptr = token->data;
g_make_token_header(&ctx->mech_used, 22 + tmsglen, &ptr);
g_make_token_header(&ctx->mech_used, 22, &ptr);
*ptr++ = (unsigned char) ((toktype>>8)&0xff);
*ptr++ = (unsigned char) (toktype&0xff);
*ptr++ = (unsigned char) ((KG_TOK_MIC_MSG>>8)&0xff);
*ptr++ = (unsigned char) (KG_TOK_MIC_MSG&0xff);
/* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */
krb5_hdr = ptr - 2;
@ -133,17 +115,9 @@ krb5_make_token(struct krb5_ctx *ctx, int qop_req,
*(u16 *)(krb5_hdr + 2) = htons(ctx->signalg);
memset(krb5_hdr + 4, 0xff, 4);
if (toktype == KG_TOK_WRAP_MSG)
*(u16 *)(krb5_hdr + 4) = htons(ctx->sealalg);
if (toktype == KG_TOK_WRAP_MSG) {
/* XXX removing support for now */
if (make_checksum(checksum_type, krb5_hdr, 8, text, &md5cksum))
goto out_err;
} else { /* Sign only. */
if (make_checksum(checksum_type, krb5_hdr, 8, text,
&md5cksum))
goto out_err;
}
switch (ctx->signalg) {
case SGN_ALG_DES_MAC_MD5:

30
net/sunrpc/auth_gss/gss_krb5_unseal.c
View File

@ -68,20 +68,13 @@
#endif
/* message_buffer is an input if toktype is MIC and an output if it is WRAP:
* If toktype is MIC: read_token is a mic token, and message_buffer is the
* data that the mic was supposedly taken over.
* If toktype is WRAP: read_token is a wrap token, and message_buffer is used
* to return the decrypted data.
*/
/* read_token is a mic token, and message_buffer is the data that the mic was
* supposedly taken over. */
/* XXX will need to change prototype and/or just split into a separate function
* when we add privacy (because read_token will be in pages too). */
u32
krb5_read_token(struct krb5_ctx *ctx,
struct xdr_netobj *read_token,
struct xdr_buf *message_buffer,
int *qop_state, int toktype)
struct xdr_buf *message_buffer, int *qop_state)
{
int signalg;
int sealalg;
@ -100,16 +93,12 @@ krb5_read_token(struct krb5_ctx *ctx,
read_token->len))
goto out;
if ((*ptr++ != ((toktype>>8)&0xff)) || (*ptr++ != (toktype&0xff)))
if ((*ptr++ != ((KG_TOK_MIC_MSG>>8)&0xff)) ||
(*ptr++ != ( KG_TOK_MIC_MSG &0xff)) )
goto out;
/* XXX sanity-check bodysize?? */
if (toktype == KG_TOK_WRAP_MSG) {
/* XXX gone */
goto out;
}
/* get the sign and seal algorithms */
signalg = ptr[0] + (ptr[1] << 8);
@ -120,14 +109,7 @@ krb5_read_token(struct krb5_ctx *ctx,
if ((ptr[4] != 0xff) || (ptr[5] != 0xff))
goto out;
if (((toktype != KG_TOK_WRAP_MSG) && (sealalg != 0xffff)) ||
((toktype == KG_TOK_WRAP_MSG) && (sealalg == 0xffff)))
goto out;
/* in the current spec, there is only one valid seal algorithm per
key type, so a simple comparison is ok */
if ((toktype == KG_TOK_WRAP_MSG) && !(sealalg == ctx->sealalg))
if (sealalg != 0xffff)
goto out;
/* there are several mappings of seal algorithms to sign algorithms,