gss_krb5: create a define for token header size and clean up ptr location
cleanup: Document token header size with a #define instead of open-coding it. Don't needlessly increment "ptr" past the beginning of the header which makes the values passed to functions more understandable and eliminates the need for extra "krb5_hdr" pointer. Clean up some intersecting white-space issues flagged by checkpatch.pl. This leaves the checksum length hard-coded at 8 for DES. A later patch cleans that up. Signed-off-by: Kevin Coffman <kwc@citi.umich.edu> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
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@ -51,6 +51,9 @@ struct krb5_ctx {
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extern spinlock_t krb5_seq_lock;
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/* The length of the Kerberos GSS token header */
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#define GSS_KRB5_TOK_HDR_LEN (16)
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#define KG_TOK_MIC_MSG 0x0101
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#define KG_TOK_WRAP_MSG 0x0201
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@ -78,7 +78,7 @@ gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
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struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
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char cksumdata[16];
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struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata};
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unsigned char *ptr, *krb5_hdr, *msg_start;
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unsigned char *ptr, *msg_start;
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s32 now;
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u32 seq_send;
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@ -87,36 +87,36 @@ gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
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now = get_seconds();
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token->len = g_token_size(&ctx->mech_used, 24);
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token->len = g_token_size(&ctx->mech_used, GSS_KRB5_TOK_HDR_LEN + 8);
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ptr = token->data;
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g_make_token_header(&ctx->mech_used, 24, &ptr);
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g_make_token_header(&ctx->mech_used, GSS_KRB5_TOK_HDR_LEN + 8, &ptr);
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*ptr++ = (unsigned char) ((KG_TOK_MIC_MSG>>8)&0xff);
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*ptr++ = (unsigned char) (KG_TOK_MIC_MSG&0xff);
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/* ptr now at header described in rfc 1964, section 1.2.1: */
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ptr[0] = (unsigned char) ((KG_TOK_MIC_MSG >> 8) & 0xff);
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ptr[1] = (unsigned char) (KG_TOK_MIC_MSG & 0xff);
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/* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */
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krb5_hdr = ptr - 2;
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msg_start = krb5_hdr + 24;
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msg_start = ptr + GSS_KRB5_TOK_HDR_LEN + 8;
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*(__be16 *)(krb5_hdr + 2) = htons(SGN_ALG_DES_MAC_MD5);
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memset(krb5_hdr + 4, 0xff, 4);
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*(__be16 *)(ptr + 2) = htons(SGN_ALG_DES_MAC_MD5);
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memset(ptr + 4, 0xff, 4);
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if (make_checksum("md5", krb5_hdr, 8, text, 0, &md5cksum))
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if (make_checksum("md5", ptr, 8, text, 0, &md5cksum))
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return GSS_S_FAILURE;
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if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,
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md5cksum.data, md5cksum.len))
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return GSS_S_FAILURE;
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memcpy(krb5_hdr + 16, md5cksum.data + md5cksum.len - 8, 8);
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memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data + md5cksum.len - 8, 8);
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spin_lock(&krb5_seq_lock);
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seq_send = ctx->seq_send++;
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spin_unlock(&krb5_seq_lock);
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if (krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff,
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seq_send, krb5_hdr + 16, krb5_hdr + 8))
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seq_send, ptr + GSS_KRB5_TOK_HDR_LEN,
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ptr + 8))
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return GSS_S_FAILURE;
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return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
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@ -92,30 +92,30 @@ gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
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read_token->len))
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return GSS_S_DEFECTIVE_TOKEN;
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if ((*ptr++ != ((KG_TOK_MIC_MSG>>8)&0xff)) ||
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(*ptr++ != ( KG_TOK_MIC_MSG &0xff)) )
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if ((ptr[0] != ((KG_TOK_MIC_MSG >> 8) & 0xff)) ||
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(ptr[1] != (KG_TOK_MIC_MSG & 0xff)))
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return GSS_S_DEFECTIVE_TOKEN;
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/* XXX sanity-check bodysize?? */
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signalg = ptr[0] + (ptr[1] << 8);
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signalg = ptr[2] + (ptr[3] << 8);
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if (signalg != SGN_ALG_DES_MAC_MD5)
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return GSS_S_DEFECTIVE_TOKEN;
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sealalg = ptr[2] + (ptr[3] << 8);
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sealalg = ptr[4] + (ptr[5] << 8);
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if (sealalg != SEAL_ALG_NONE)
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return GSS_S_DEFECTIVE_TOKEN;
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if ((ptr[4] != 0xff) || (ptr[5] != 0xff))
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if ((ptr[6] != 0xff) || (ptr[7] != 0xff))
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return GSS_S_DEFECTIVE_TOKEN;
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if (make_checksum("md5", ptr - 2, 8, message_buffer, 0, &md5cksum))
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if (make_checksum("md5", ptr, 8, message_buffer, 0, &md5cksum))
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return GSS_S_FAILURE;
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if (krb5_encrypt(ctx->seq, NULL, md5cksum.data, md5cksum.data, 16))
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return GSS_S_FAILURE;
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if (memcmp(md5cksum.data + 8, ptr + 14, 8))
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if (memcmp(md5cksum.data + 8, ptr + GSS_KRB5_TOK_HDR_LEN, 8))
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return GSS_S_BAD_SIG;
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/* it got through unscathed. Make sure the context is unexpired */
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@ -127,7 +127,7 @@ gss_verify_mic_kerberos(struct gss_ctx *gss_ctx,
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/* do sequencing checks */
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if (krb5_get_seq_num(ctx->seq, ptr + 14, ptr + 6, &direction, &seqnum))
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if (krb5_get_seq_num(ctx->seq, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8, &direction, &seqnum))
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return GSS_S_FAILURE;
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if ((ctx->initiate && direction != 0xff) ||
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@ -122,7 +122,7 @@ gss_wrap_kerberos(struct gss_ctx *ctx, int offset,
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char cksumdata[16];
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struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata};
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int blocksize = 0, plainlen;
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unsigned char *ptr, *krb5_hdr, *msg_start;
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unsigned char *ptr, *msg_start;
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s32 now;
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int headlen;
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struct page **tmp_pages;
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@ -149,26 +149,26 @@ gss_wrap_kerberos(struct gss_ctx *ctx, int offset,
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buf->len += headlen;
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BUG_ON((buf->len - offset - headlen) % blocksize);
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g_make_token_header(&kctx->mech_used, 24 + plainlen, &ptr);
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g_make_token_header(&kctx->mech_used,
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GSS_KRB5_TOK_HDR_LEN + 8 + plainlen, &ptr);
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*ptr++ = (unsigned char) ((KG_TOK_WRAP_MSG>>8)&0xff);
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*ptr++ = (unsigned char) (KG_TOK_WRAP_MSG&0xff);
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/* ptr now at header described in rfc 1964, section 1.2.1: */
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ptr[0] = (unsigned char) ((KG_TOK_WRAP_MSG >> 8) & 0xff);
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ptr[1] = (unsigned char) (KG_TOK_WRAP_MSG & 0xff);
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/* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */
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krb5_hdr = ptr - 2;
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msg_start = krb5_hdr + 24;
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msg_start = ptr + 24;
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*(__be16 *)(krb5_hdr + 2) = htons(SGN_ALG_DES_MAC_MD5);
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memset(krb5_hdr + 4, 0xff, 4);
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*(__be16 *)(krb5_hdr + 4) = htons(SEAL_ALG_DES);
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*(__be16 *)(ptr + 2) = htons(SGN_ALG_DES_MAC_MD5);
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memset(ptr + 4, 0xff, 4);
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*(__be16 *)(ptr + 4) = htons(SEAL_ALG_DES);
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make_confounder(msg_start, blocksize);
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/* XXXJBF: UGH!: */
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tmp_pages = buf->pages;
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buf->pages = pages;
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if (make_checksum("md5", krb5_hdr, 8, buf,
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if (make_checksum("md5", ptr, 8, buf,
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offset + headlen - blocksize, &md5cksum))
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return GSS_S_FAILURE;
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buf->pages = tmp_pages;
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@ -176,7 +176,7 @@ gss_wrap_kerberos(struct gss_ctx *ctx, int offset,
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if (krb5_encrypt(kctx->seq, NULL, md5cksum.data,
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md5cksum.data, md5cksum.len))
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return GSS_S_FAILURE;
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memcpy(krb5_hdr + 16, md5cksum.data + md5cksum.len - 8, 8);
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memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data + md5cksum.len - 8, 8);
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spin_lock(&krb5_seq_lock);
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seq_send = kctx->seq_send++;
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@ -185,7 +185,7 @@ gss_wrap_kerberos(struct gss_ctx *ctx, int offset,
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/* XXX would probably be more efficient to compute checksum
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* and encrypt at the same time: */
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if ((krb5_make_seq_num(kctx->seq, kctx->initiate ? 0 : 0xff,
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seq_send, krb5_hdr + 16, krb5_hdr + 8)))
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seq_send, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8)))
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return GSS_S_FAILURE;
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if (gss_encrypt_xdr_buf(kctx->enc, buf, offset + headlen - blocksize,
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@ -219,38 +219,38 @@ gss_unwrap_kerberos(struct gss_ctx *ctx, int offset, struct xdr_buf *buf)
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buf->len - offset))
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return GSS_S_DEFECTIVE_TOKEN;
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if ((*ptr++ != ((KG_TOK_WRAP_MSG>>8)&0xff)) ||
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(*ptr++ != (KG_TOK_WRAP_MSG &0xff)) )
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if ((ptr[0] != ((KG_TOK_WRAP_MSG >> 8) & 0xff)) ||
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(ptr[1] != (KG_TOK_WRAP_MSG & 0xff)))
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return GSS_S_DEFECTIVE_TOKEN;
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/* XXX sanity-check bodysize?? */
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/* get the sign and seal algorithms */
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signalg = ptr[0] + (ptr[1] << 8);
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signalg = ptr[2] + (ptr[3] << 8);
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if (signalg != SGN_ALG_DES_MAC_MD5)
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return GSS_S_DEFECTIVE_TOKEN;
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sealalg = ptr[2] + (ptr[3] << 8);
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sealalg = ptr[4] + (ptr[5] << 8);
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if (sealalg != SEAL_ALG_DES)
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return GSS_S_DEFECTIVE_TOKEN;
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if ((ptr[4] != 0xff) || (ptr[5] != 0xff))
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if ((ptr[6] != 0xff) || (ptr[7] != 0xff))
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return GSS_S_DEFECTIVE_TOKEN;
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if (gss_decrypt_xdr_buf(kctx->enc, buf,
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ptr + 22 - (unsigned char *)buf->head[0].iov_base))
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ptr + GSS_KRB5_TOK_HDR_LEN + 8 - (unsigned char *)buf->head[0].iov_base))
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return GSS_S_DEFECTIVE_TOKEN;
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if (make_checksum("md5", ptr - 2, 8, buf,
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ptr + 22 - (unsigned char *)buf->head[0].iov_base, &md5cksum))
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if (make_checksum("md5", ptr, 8, buf,
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ptr + GSS_KRB5_TOK_HDR_LEN + 8 - (unsigned char *)buf->head[0].iov_base, &md5cksum))
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return GSS_S_FAILURE;
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if (krb5_encrypt(kctx->seq, NULL, md5cksum.data,
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md5cksum.data, md5cksum.len))
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return GSS_S_FAILURE;
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if (memcmp(md5cksum.data + 8, ptr + 14, 8))
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if (memcmp(md5cksum.data + 8, ptr + GSS_KRB5_TOK_HDR_LEN, 8))
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return GSS_S_BAD_SIG;
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/* it got through unscathed. Make sure the context is unexpired */
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@ -262,8 +262,8 @@ gss_unwrap_kerberos(struct gss_ctx *ctx, int offset, struct xdr_buf *buf)
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/* do sequencing checks */
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if (krb5_get_seq_num(kctx->seq, ptr + 14, ptr + 6, &direction,
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&seqnum))
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if (krb5_get_seq_num(kctx->seq, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8,
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&direction, &seqnum))
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return GSS_S_BAD_SIG;
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if ((kctx->initiate && direction != 0xff) ||
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@ -274,7 +274,7 @@ gss_unwrap_kerberos(struct gss_ctx *ctx, int offset, struct xdr_buf *buf)
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* better to copy and encrypt at the same time. */
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blocksize = crypto_blkcipher_blocksize(kctx->enc);
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data_start = ptr + 22 + blocksize;
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data_start = ptr + GSS_KRB5_TOK_HDR_LEN + 8 + blocksize;
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orig_start = buf->head[0].iov_base + offset;
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data_len = (buf->head[0].iov_base + buf->head[0].iov_len) - data_start;
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memmove(orig_start, data_start, data_len);
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