From: Kevin Coffman Subject: [enctypes round 3: PATCH 22/24] gss_krb5: add confounder length to kerberos enctype framework Date: Tue, 06 May 2008 17:05:24 -0400 Message-ID: <20080506210524.3770.84533.stgit@jazz.citi.umich.edu> References: <20080506210156.3770.95914.stgit@jazz.citi.umich.edu> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Cc: linux-nfs@vger.kernel.org To: bfields@fieldses.org Return-path: Received: from citi.umich.edu ([141.211.133.111]:40686 "EHLO citi.umich.edu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932229AbYEFVFZ (ORCPT ); Tue, 6 May 2008 17:05:25 -0400 In-Reply-To: <20080506210156.3770.95914.stgit-zTNJhAanYLVZN1qrTdtDg5Vzexx5G7lz@public.gmane.org> Sender: linux-nfs-owner@vger.kernel.org List-ID: All encryption types use a confounder at the beginning of the wrap token. In all encryption types except arcfour-hmac, the confounder is the same as the blocksize. arcfour-hmac has a blocksize of one, but uses an eight byte confounder. Add an entry to the crypto framework definitions for the confounder length and change the wrap/unwrap code to use the confounder length rather than assuming it is always the blocksize. Signed-off-by: Kevin Coffman --- include/linux/sunrpc/gss_krb5.h | 3 +++ net/sunrpc/auth_gss/gss_krb5_crypto.c | 6 +++--- net/sunrpc/auth_gss/gss_krb5_mech.c | 4 ++++ net/sunrpc/auth_gss/gss_krb5_wrap.c | 12 +++++++----- 4 files changed, 17 insertions(+), 8 deletions(-) diff --git a/include/linux/sunrpc/gss_krb5.h b/include/linux/sunrpc/gss_krb5.h index de87e20..d9f3834 100644 --- a/include/linux/sunrpc/gss_krb5.h +++ b/include/linux/sunrpc/gss_krb5.h @@ -64,6 +64,9 @@ struct gss_krb5_enctype { const u16 signalg; /* signing algorithm */ const u16 sealalg; /* sealing algorithm */ const u32 blocksize; /* encryption blocksize */ + const u32 conflen; /* confounder length + (normally the same as + the blocksize) */ const u32 cksumlength; /* checksum length */ const u32 keyed_cksum; /* is it a keyed cksum? */ const u32 keybytes; /* raw key len, in bytes */ diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c index deb3530..6482185 100644 --- a/net/sunrpc/auth_gss/gss_krb5_crypto.c +++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c @@ -573,9 +573,9 @@ gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset, /* hide the gss token header and insert the confounder */ offset += GSS_KRB5_TOK_HDR_LEN; - if (shift_head_data(buf, offset, blocksize)) + if (shift_head_data(buf, offset, kctx->gk5e->conflen)) return GSS_S_FAILURE; - make_confounder(buf->head[0].iov_base + offset, blocksize); + make_confounder(buf->head[0].iov_base + offset, kctx->gk5e->conflen); offset -= GSS_KRB5_TOK_HDR_LEN; if (buf->tail[0].iov_base != NULL) { @@ -745,7 +745,7 @@ gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset, struct xdr_buf *buf, ret = GSS_S_BAD_SIG; goto out_err; } - *headskip = crypto_blkcipher_blocksize(cipher); + *headskip = kctx->gk5e->conflen; *tailskip = kctx->gk5e->cksumlength; out_err: if (ret && ret != GSS_S_BAD_SIG) diff --git a/net/sunrpc/auth_gss/gss_krb5_mech.c b/net/sunrpc/auth_gss/gss_krb5_mech.c index 5564d6b..a7a91b0 100644 --- a/net/sunrpc/auth_gss/gss_krb5_mech.c +++ b/net/sunrpc/auth_gss/gss_krb5_mech.c @@ -68,6 +68,7 @@ static struct gss_krb5_enctype supported_gss_krb5_enctypes[] = { .keybytes = 7, .keylength = 8, .blocksize = 8, + .conflen = 8, .cksumlength = 8, .keyed_cksum = 0, }, @@ -88,6 +89,7 @@ static struct gss_krb5_enctype supported_gss_krb5_enctypes[] = { .keybytes = 21, .keylength = 24, .blocksize = 8, + .conflen = 8, .cksumlength = 20, .keyed_cksum = 1, }, @@ -110,6 +112,7 @@ static struct gss_krb5_enctype supported_gss_krb5_enctypes[] = { .keybytes = 16, .keylength = 16, .blocksize = 16, + .conflen = 16, .cksumlength = 12, .keyed_cksum = 1, }, @@ -132,6 +135,7 @@ static struct gss_krb5_enctype supported_gss_krb5_enctypes[] = { .keybytes = 32, .keylength = 32, .blocksize = 16, + .conflen = 16, .cksumlength = 12, .keyed_cksum = 1, }, diff --git a/net/sunrpc/auth_gss/gss_krb5_wrap.c b/net/sunrpc/auth_gss/gss_krb5_wrap.c index 2a0d72f..8269f37 100644 --- a/net/sunrpc/auth_gss/gss_krb5_wrap.c +++ b/net/sunrpc/auth_gss/gss_krb5_wrap.c @@ -169,6 +169,7 @@ gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset, struct page **tmp_pages; u32 seq_send; u8 *cksumkey; + u32 conflen = kctx->gk5e->conflen; dprintk("RPC: %s\n", __func__); @@ -178,7 +179,7 @@ gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset, blocksize = crypto_blkcipher_blocksize(kctx->enc); gss_krb5_add_padding(buf, offset, blocksize); BUG_ON((buf->len - offset) % blocksize); - plainlen = blocksize + buf->len - offset; + plainlen = conflen + buf->len - offset; headlen = g_token_size(&kctx->mech_used, GSS_KRB5_TOK_HDR_LEN + kctx->gk5e->cksumlength + plainlen) - @@ -206,7 +207,7 @@ gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset, memset(ptr + 4, 0xff, 4); *(__be16 *)(ptr + 4) = cpu_to_le16(kctx->gk5e->sealalg); - make_confounder(msg_start, blocksize); + make_confounder(msg_start, conflen); if (kctx->gk5e->keyed_cksum) cksumkey = kctx->cksum; @@ -216,7 +217,7 @@ gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset, /* XXXJBF: UGH!: */ tmp_pages = buf->pages; buf->pages = pages; - if (make_checksum(kctx, ptr, 8, buf, offset + headlen - blocksize, + if (make_checksum(kctx, ptr, 8, buf, offset + headlen - conflen, cksumkey, KG_USAGE_SEAL, &md5cksum)) return GSS_S_FAILURE; buf->pages = tmp_pages; @@ -233,7 +234,7 @@ gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset, seq_send, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8))) return GSS_S_FAILURE; - if (gss_encrypt_xdr_buf(kctx->enc, buf, offset + headlen - blocksize, + if (gss_encrypt_xdr_buf(kctx->enc, buf, offset + headlen - conflen, pages)) return GSS_S_FAILURE; @@ -256,6 +257,7 @@ gss_unwrap_kerberos_v1(struct krb5_ctx *kctx, int offset, struct xdr_buf *buf) void *data_start, *orig_start; int data_len; int blocksize; + u32 conflen = kctx->gk5e->conflen; int crypt_offset; u8 *cksumkey; @@ -329,7 +331,7 @@ gss_unwrap_kerberos_v1(struct krb5_ctx *kctx, int offset, struct xdr_buf *buf) blocksize = crypto_blkcipher_blocksize(kctx->enc); data_start = ptr + (GSS_KRB5_TOK_HDR_LEN + kctx->gk5e->cksumlength) + - blocksize; + conflen; orig_start = buf->head[0].iov_base + offset; data_len = (buf->head[0].iov_base + buf->head[0].iov_len) - data_start; memmove(orig_start, data_start, data_len);