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Diffstat (limited to 'net/sunrpc/auth_gss/gss_krb5_seal.c')
-rw-r--r--net/sunrpc/auth_gss/gss_krb5_seal.c193
1 files changed, 134 insertions, 59 deletions
diff --git a/net/sunrpc/auth_gss/gss_krb5_seal.c b/net/sunrpc/auth_gss/gss_krb5_seal.c
index 13f8ae97945..62ae3273186 100644
--- a/net/sunrpc/auth_gss/gss_krb5_seal.c
+++ b/net/sunrpc/auth_gss/gss_krb5_seal.c
@@ -3,7 +3,7 @@
*
* Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.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>
@@ -59,90 +59,165 @@
*/
#include <linux/types.h>
-#include <linux/slab.h>
#include <linux/jiffies.h>
#include <linux/sunrpc/gss_krb5.h>
#include <linux/random.h>
-#include <asm/scatterlist.h>
#include <linux/crypto.h>
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_AUTH
#endif
-u32
-gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
+DEFINE_SPINLOCK(krb5_seq_lock);
+
+static char *
+setup_token(struct krb5_ctx *ctx, struct xdr_netobj *token)
+{
+ __be16 *ptr, *krb5_hdr;
+ int body_size = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength;
+
+ token->len = g_token_size(&ctx->mech_used, body_size);
+
+ ptr = (__be16 *)token->data;
+ g_make_token_header(&ctx->mech_used, body_size, (unsigned char **)&ptr);
+
+ /* ptr now at start of header described in rfc 1964, section 1.2.1: */
+ krb5_hdr = ptr;
+ *ptr++ = KG_TOK_MIC_MSG;
+ *ptr++ = cpu_to_le16(ctx->gk5e->signalg);
+ *ptr++ = SEAL_ALG_NONE;
+ *ptr++ = 0xffff;
+
+ return (char *)krb5_hdr;
+}
+
+static void *
+setup_token_v2(struct krb5_ctx *ctx, struct xdr_netobj *token)
+{
+ __be16 *ptr, *krb5_hdr;
+ u8 *p, flags = 0x00;
+
+ if ((ctx->flags & KRB5_CTX_FLAG_INITIATOR) == 0)
+ flags |= 0x01;
+ if (ctx->flags & KRB5_CTX_FLAG_ACCEPTOR_SUBKEY)
+ flags |= 0x04;
+
+ /* Per rfc 4121, sec 4.2.6.1, there is no header,
+ * just start the token */
+ krb5_hdr = ptr = (__be16 *)token->data;
+
+ *ptr++ = KG2_TOK_MIC;
+ p = (u8 *)ptr;
+ *p++ = flags;
+ *p++ = 0xff;
+ ptr = (__be16 *)p;
+ *ptr++ = 0xffff;
+ *ptr++ = 0xffff;
+
+ token->len = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength;
+ return krb5_hdr;
+}
+
+static u32
+gss_get_mic_v1(struct krb5_ctx *ctx, struct xdr_buf *text,
struct xdr_netobj *token)
{
- struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
- s32 checksum_type;
- struct xdr_netobj md5cksum = {.len = 0, .data = NULL};
- unsigned char *ptr, *krb5_hdr, *msg_start;
+ char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+ struct xdr_netobj md5cksum = {.len = sizeof(cksumdata),
+ .data = cksumdata};
+ void *ptr;
s32 now;
+ u32 seq_send;
+ u8 *cksumkey;
- dprintk("RPC: gss_krb5_seal\n");
+ dprintk("RPC: %s\n", __func__);
+ BUG_ON(ctx == NULL);
now = get_seconds();
- switch (ctx->signalg) {
- case SGN_ALG_DES_MAC_MD5:
- checksum_type = CKSUMTYPE_RSA_MD5;
- break;
- default:
- dprintk("RPC: gss_krb5_seal: ctx->signalg %d not"
- " supported\n", ctx->signalg);
- goto out_err;
- }
- if (ctx->sealalg != SEAL_ALG_NONE && ctx->sealalg != SEAL_ALG_DES) {
- dprintk("RPC: gss_krb5_seal: ctx->sealalg %d not supported\n",
- ctx->sealalg);
- goto out_err;
- }
-
- token->len = g_token_size(&ctx->mech_used, 22);
+ ptr = setup_token(ctx, token);
- ptr = token->data;
- g_make_token_header(&ctx->mech_used, 22, &ptr);
+ if (ctx->gk5e->keyed_cksum)
+ cksumkey = ctx->cksum;
+ else
+ cksumkey = NULL;
- *ptr++ = (unsigned char) ((KG_TOK_MIC_MSG>>8)&0xff);
- *ptr++ = (unsigned char) (KG_TOK_MIC_MSG&0xff);
+ if (make_checksum(ctx, ptr, 8, text, 0, cksumkey,
+ KG_USAGE_SIGN, &md5cksum))
+ return GSS_S_FAILURE;
- /* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */
- krb5_hdr = ptr - 2;
- msg_start = krb5_hdr + 24;
+ memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data, md5cksum.len);
- *(u16 *)(krb5_hdr + 2) = htons(ctx->signalg);
- memset(krb5_hdr + 4, 0xff, 4);
+ spin_lock(&krb5_seq_lock);
+ seq_send = ctx->seq_send++;
+ spin_unlock(&krb5_seq_lock);
- if (make_checksum(checksum_type, krb5_hdr, 8, text, 0, &md5cksum))
- goto out_err;
+ if (krb5_make_seq_num(ctx, ctx->seq, ctx->initiate ? 0 : 0xff,
+ seq_send, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8))
+ return GSS_S_FAILURE;
- switch (ctx->signalg) {
- case SGN_ALG_DES_MAC_MD5:
- if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,
- md5cksum.data, md5cksum.len))
- goto out_err;
- memcpy(krb5_hdr + 16,
- md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH,
- KRB5_CKSUM_LENGTH);
+ return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
+}
- dprintk("RPC: make_seal_token: cksum data: \n");
- print_hexl((u32 *) (krb5_hdr + 16), KRB5_CKSUM_LENGTH, 0);
- break;
- default:
- BUG();
+static u32
+gss_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text,
+ struct xdr_netobj *token)
+{
+ char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+ struct xdr_netobj cksumobj = { .len = sizeof(cksumdata),
+ .data = cksumdata};
+ void *krb5_hdr;
+ s32 now;
+ u64 seq_send;
+ u8 *cksumkey;
+ unsigned int cksum_usage;
+
+ dprintk("RPC: %s\n", __func__);
+
+ krb5_hdr = setup_token_v2(ctx, token);
+
+ /* Set up the sequence number. Now 64-bits in clear
+ * text and w/o direction indicator */
+ spin_lock(&krb5_seq_lock);
+ seq_send = ctx->seq_send64++;
+ spin_unlock(&krb5_seq_lock);
+ *((u64 *)(krb5_hdr + 8)) = cpu_to_be64(seq_send);
+
+ if (ctx->initiate) {
+ cksumkey = ctx->initiator_sign;
+ cksum_usage = KG_USAGE_INITIATOR_SIGN;
+ } else {
+ cksumkey = ctx->acceptor_sign;
+ cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
}
- kfree(md5cksum.data);
+ if (make_checksum_v2(ctx, krb5_hdr, GSS_KRB5_TOK_HDR_LEN,
+ text, 0, cksumkey, cksum_usage, &cksumobj))
+ return GSS_S_FAILURE;
- if ((krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff,
- ctx->seq_send, krb5_hdr + 16, krb5_hdr + 8)))
- goto out_err;
+ memcpy(krb5_hdr + GSS_KRB5_TOK_HDR_LEN, cksumobj.data, cksumobj.len);
- ctx->seq_send++;
+ now = get_seconds();
- return ((ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE);
-out_err:
- if (md5cksum.data) kfree(md5cksum.data);
- return GSS_S_FAILURE;
+ return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
}
+
+u32
+gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
+ struct xdr_netobj *token)
+{
+ struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
+
+ switch (ctx->enctype) {
+ default:
+ BUG();
+ case ENCTYPE_DES_CBC_RAW:
+ case ENCTYPE_DES3_CBC_RAW:
+ case ENCTYPE_ARCFOUR_HMAC:
+ return gss_get_mic_v1(ctx, text, token);
+ case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+ case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+ return gss_get_mic_v2(ctx, text, token);
+ }
+}
+
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-05 23:10:01 +0000