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path: root/net/sunrpc/auth_gss/auth_gss.c
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Diffstat (limited to 'net/sunrpc/auth_gss/auth_gss.c')
-rw-r--r--net/sunrpc/auth_gss/auth_gss.c187
1 files changed, 158 insertions, 29 deletions
diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c
index 2f7b867161d2..f44f46f1d8e0 100644
--- a/net/sunrpc/auth_gss/auth_gss.c
+++ b/net/sunrpc/auth_gss/auth_gss.c
@@ -42,9 +42,8 @@
#include <linux/init.h>
#include <linux/types.h>
#include <linux/slab.h>
-#include <linux/socket.h>
-#include <linux/in.h>
#include <linux/sched.h>
+#include <linux/pagemap.h>
#include <linux/sunrpc/clnt.h>
#include <linux/sunrpc/auth.h>
#include <linux/sunrpc/auth_gss.h>
@@ -846,10 +845,8 @@ gss_marshal(struct rpc_task *task, u32 *p)
/* We compute the checksum for the verifier over the xdr-encoded bytes
* starting with the xid and ending at the end of the credential: */
- iov.iov_base = req->rq_snd_buf.head[0].iov_base;
- if (task->tk_client->cl_xprt->stream)
- /* See clnt.c:call_header() */
- iov.iov_base += 4;
+ iov.iov_base = xprt_skip_transport_header(task->tk_xprt,
+ req->rq_snd_buf.head[0].iov_base);
iov.iov_len = (u8 *)p - (u8 *)iov.iov_base;
xdr_buf_from_iov(&iov, &verf_buf);
@@ -857,9 +854,7 @@ gss_marshal(struct rpc_task *task, u32 *p)
*p++ = htonl(RPC_AUTH_GSS);
mic.data = (u8 *)(p + 1);
- maj_stat = gss_get_mic(ctx->gc_gss_ctx,
- GSS_C_QOP_DEFAULT,
- &verf_buf, &mic);
+ maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
if (maj_stat == GSS_S_CONTEXT_EXPIRED) {
cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
} else if (maj_stat != 0) {
@@ -890,10 +885,8 @@ static u32 *
gss_validate(struct rpc_task *task, u32 *p)
{
struct rpc_cred *cred = task->tk_msg.rpc_cred;
- struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
- gc_base);
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
- u32 seq, qop_state;
+ u32 seq;
struct kvec iov;
struct xdr_buf verf_buf;
struct xdr_netobj mic;
@@ -914,23 +907,14 @@ gss_validate(struct rpc_task *task, u32 *p)
mic.data = (u8 *)p;
mic.len = len;
- maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic, &qop_state);
+ maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic);
if (maj_stat == GSS_S_CONTEXT_EXPIRED)
cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
if (maj_stat)
goto out_bad;
- switch (gss_cred->gc_service) {
- case RPC_GSS_SVC_NONE:
- /* verifier data, flavor, length: */
- task->tk_auth->au_rslack = XDR_QUADLEN(len) + 2;
- break;
- case RPC_GSS_SVC_INTEGRITY:
- /* verifier data, flavor, length, length, sequence number: */
- task->tk_auth->au_rslack = XDR_QUADLEN(len) + 4;
- break;
- case RPC_GSS_SVC_PRIVACY:
- goto out_bad;
- }
+ /* We leave it to unwrap to calculate au_rslack. For now we just
+ * calculate the length of the verifier: */
+ task->tk_auth->au_verfsize = XDR_QUADLEN(len) + 2;
gss_put_ctx(ctx);
dprintk("RPC: %4u GSS gss_validate: gss_verify_mic succeeded.\n",
task->tk_pid);
@@ -975,8 +959,7 @@ gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
p = iov->iov_base + iov->iov_len;
mic.data = (u8 *)(p + 1);
- maj_stat = gss_get_mic(ctx->gc_gss_ctx,
- GSS_C_QOP_DEFAULT, &integ_buf, &mic);
+ maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
status = -EIO; /* XXX? */
if (maj_stat == GSS_S_CONTEXT_EXPIRED)
cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
@@ -990,6 +973,113 @@ gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
return 0;
}
+static void
+priv_release_snd_buf(struct rpc_rqst *rqstp)
+{
+ int i;
+
+ for (i=0; i < rqstp->rq_enc_pages_num; i++)
+ __free_page(rqstp->rq_enc_pages[i]);
+ kfree(rqstp->rq_enc_pages);
+}
+
+static int
+alloc_enc_pages(struct rpc_rqst *rqstp)
+{
+ struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
+ int first, last, i;
+
+ if (snd_buf->page_len == 0) {
+ rqstp->rq_enc_pages_num = 0;
+ return 0;
+ }
+
+ first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
+ last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT;
+ rqstp->rq_enc_pages_num = last - first + 1 + 1;
+ rqstp->rq_enc_pages
+ = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *),
+ GFP_NOFS);
+ if (!rqstp->rq_enc_pages)
+ goto out;
+ for (i=0; i < rqstp->rq_enc_pages_num; i++) {
+ rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS);
+ if (rqstp->rq_enc_pages[i] == NULL)
+ goto out_free;
+ }
+ rqstp->rq_release_snd_buf = priv_release_snd_buf;
+ return 0;
+out_free:
+ for (i--; i >= 0; i--) {
+ __free_page(rqstp->rq_enc_pages[i]);
+ }
+out:
+ return -EAGAIN;
+}
+
+static inline int
+gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
+ kxdrproc_t encode, struct rpc_rqst *rqstp, u32 *p, void *obj)
+{
+ struct xdr_buf *snd_buf = &rqstp->rq_snd_buf;
+ u32 offset;
+ u32 maj_stat;
+ int status;
+ u32 *opaque_len;
+ struct page **inpages;
+ int first;
+ int pad;
+ struct kvec *iov;
+ char *tmp;
+
+ opaque_len = p++;
+ offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base;
+ *p++ = htonl(rqstp->rq_seqno);
+
+ status = encode(rqstp, p, obj);
+ if (status)
+ return status;
+
+ status = alloc_enc_pages(rqstp);
+ if (status)
+ return status;
+ first = snd_buf->page_base >> PAGE_CACHE_SHIFT;
+ inpages = snd_buf->pages + first;
+ snd_buf->pages = rqstp->rq_enc_pages;
+ snd_buf->page_base -= first << PAGE_CACHE_SHIFT;
+ /* Give the tail its own page, in case we need extra space in the
+ * head when wrapping: */
+ if (snd_buf->page_len || snd_buf->tail[0].iov_len) {
+ tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]);
+ memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len);
+ snd_buf->tail[0].iov_base = tmp;
+ }
+ maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages);
+ /* RPC_SLACK_SPACE should prevent this ever happening: */
+ BUG_ON(snd_buf->len > snd_buf->buflen);
+ status = -EIO;
+ /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was
+ * done anyway, so it's safe to put the request on the wire: */
+ if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+ cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
+ else if (maj_stat)
+ return status;
+
+ *opaque_len = htonl(snd_buf->len - offset);
+ /* guess whether we're in the head or the tail: */
+ if (snd_buf->page_len || snd_buf->tail[0].iov_len)
+ iov = snd_buf->tail;
+ else
+ iov = snd_buf->head;
+ p = iov->iov_base + iov->iov_len;
+ pad = 3 - ((snd_buf->len - offset - 1) & 3);
+ memset(p, 0, pad);
+ iov->iov_len += pad;
+ snd_buf->len += pad;
+
+ return 0;
+}
+
static int
gss_wrap_req(struct rpc_task *task,
kxdrproc_t encode, void *rqstp, u32 *p, void *obj)
@@ -1017,6 +1107,8 @@ gss_wrap_req(struct rpc_task *task,
rqstp, p, obj);
break;
case RPC_GSS_SVC_PRIVACY:
+ status = gss_wrap_req_priv(cred, ctx, encode,
+ rqstp, p, obj);
break;
}
out:
@@ -1054,8 +1146,7 @@ gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset))
return status;
- maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf,
- &mic, NULL);
+ maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic);
if (maj_stat == GSS_S_CONTEXT_EXPIRED)
cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
if (maj_stat != GSS_S_COMPLETE)
@@ -1063,6 +1154,35 @@ gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
return 0;
}
+static inline int
+gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx,
+ struct rpc_rqst *rqstp, u32 **p)
+{
+ struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf;
+ u32 offset;
+ u32 opaque_len;
+ u32 maj_stat;
+ int status = -EIO;
+
+ opaque_len = ntohl(*(*p)++);
+ offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base;
+ if (offset + opaque_len > rcv_buf->len)
+ return status;
+ /* remove padding: */
+ rcv_buf->len = offset + opaque_len;
+
+ maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf);
+ if (maj_stat == GSS_S_CONTEXT_EXPIRED)
+ cred->cr_flags &= ~RPCAUTH_CRED_UPTODATE;
+ if (maj_stat != GSS_S_COMPLETE)
+ return status;
+ if (ntohl(*(*p)++) != rqstp->rq_seqno)
+ return status;
+
+ return 0;
+}
+
+
static int
gss_unwrap_resp(struct rpc_task *task,
kxdrproc_t decode, void *rqstp, u32 *p, void *obj)
@@ -1071,6 +1191,9 @@ gss_unwrap_resp(struct rpc_task *task,
struct gss_cred *gss_cred = container_of(cred, struct gss_cred,
gc_base);
struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred);
+ u32 *savedp = p;
+ struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head;
+ int savedlen = head->iov_len;
int status = -EIO;
if (ctx->gc_proc != RPC_GSS_PROC_DATA)
@@ -1084,8 +1207,14 @@ gss_unwrap_resp(struct rpc_task *task,
goto out;
break;
case RPC_GSS_SVC_PRIVACY:
+ status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p);
+ if (status)
+ goto out;
break;
}
+ /* take into account extra slack for integrity and privacy cases: */
+ task->tk_auth->au_rslack = task->tk_auth->au_verfsize + (p - savedp)
+ + (savedlen - head->iov_len);
out_decode:
status = decode(rqstp, p, obj);
out:
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.