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4a77c3dead
The in_token->pages[] array is not NULL terminated. This results in
the following KASAN splat:
KASAN: maybe wild-memory-access in range [0x04a2013400000008-0x04a201340000000f]
Fixes: bafa6b4d95
("SUNRPC: Fix gss_free_in_token_pages()")
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
2125 lines
51 KiB
C
2125 lines
51 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Neil Brown <neilb@cse.unsw.edu.au>
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* J. Bruce Fields <bfields@umich.edu>
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* Andy Adamson <andros@umich.edu>
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* Dug Song <dugsong@monkey.org>
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*
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* RPCSEC_GSS server authentication.
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* This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
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* (gssapi)
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*
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* The RPCSEC_GSS involves three stages:
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* 1/ context creation
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* 2/ data exchange
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* 3/ context destruction
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*
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* Context creation is handled largely by upcalls to user-space.
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* In particular, GSS_Accept_sec_context is handled by an upcall
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* Data exchange is handled entirely within the kernel
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* In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
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* Context destruction is handled in-kernel
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* GSS_Delete_sec_context is in-kernel
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*
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* Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
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* The context handle and gss_token are used as a key into the rpcsec_init cache.
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* The content of this cache includes some of the outputs of GSS_Accept_sec_context,
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* being major_status, minor_status, context_handle, reply_token.
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* These are sent back to the client.
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* Sequence window management is handled by the kernel. The window size if currently
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* a compile time constant.
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*
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* When user-space is happy that a context is established, it places an entry
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* in the rpcsec_context cache. The key for this cache is the context_handle.
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* The content includes:
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* uid/gidlist - for determining access rights
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* mechanism type
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* mechanism specific information, such as a key
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*
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*/
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/pagemap.h>
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#include <linux/user_namespace.h>
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#include <linux/sunrpc/auth_gss.h>
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#include <linux/sunrpc/gss_err.h>
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#include <linux/sunrpc/svcauth.h>
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#include <linux/sunrpc/svcauth_gss.h>
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#include <linux/sunrpc/cache.h>
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#include <linux/sunrpc/gss_krb5.h>
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#include <trace/events/rpcgss.h>
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#include "gss_rpc_upcall.h"
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/*
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* Unfortunately there isn't a maximum checksum size exported via the
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* GSS API. Manufacture one based on GSS mechanisms supported by this
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* implementation.
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*/
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#define GSS_MAX_CKSUMSIZE (GSS_KRB5_TOK_HDR_LEN + GSS_KRB5_MAX_CKSUM_LEN)
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/*
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* This value may be increased in the future to accommodate other
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* usage of the scratch buffer.
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*/
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#define GSS_SCRATCH_SIZE GSS_MAX_CKSUMSIZE
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struct gss_svc_data {
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/* decoded gss client cred: */
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struct rpc_gss_wire_cred clcred;
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u32 gsd_databody_offset;
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struct rsc *rsci;
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/* for temporary results */
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__be32 gsd_seq_num;
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u8 gsd_scratch[GSS_SCRATCH_SIZE];
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};
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/* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
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* into replies.
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*
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* Key is context handle (\x if empty) and gss_token.
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* Content is major_status minor_status (integers) context_handle, reply_token.
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*
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*/
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static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
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{
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return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
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}
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#define RSI_HASHBITS 6
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#define RSI_HASHMAX (1<<RSI_HASHBITS)
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struct rsi {
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struct cache_head h;
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struct xdr_netobj in_handle, in_token;
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struct xdr_netobj out_handle, out_token;
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int major_status, minor_status;
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struct rcu_head rcu_head;
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};
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static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
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static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
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static void rsi_free(struct rsi *rsii)
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{
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kfree(rsii->in_handle.data);
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kfree(rsii->in_token.data);
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kfree(rsii->out_handle.data);
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kfree(rsii->out_token.data);
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}
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static void rsi_free_rcu(struct rcu_head *head)
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{
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struct rsi *rsii = container_of(head, struct rsi, rcu_head);
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rsi_free(rsii);
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kfree(rsii);
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}
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static void rsi_put(struct kref *ref)
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{
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struct rsi *rsii = container_of(ref, struct rsi, h.ref);
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call_rcu(&rsii->rcu_head, rsi_free_rcu);
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}
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static inline int rsi_hash(struct rsi *item)
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{
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return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
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^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
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}
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static int rsi_match(struct cache_head *a, struct cache_head *b)
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{
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struct rsi *item = container_of(a, struct rsi, h);
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struct rsi *tmp = container_of(b, struct rsi, h);
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return netobj_equal(&item->in_handle, &tmp->in_handle) &&
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netobj_equal(&item->in_token, &tmp->in_token);
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}
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static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
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{
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dst->len = len;
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dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
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if (len && !dst->data)
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return -ENOMEM;
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return 0;
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}
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static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
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{
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return dup_to_netobj(dst, src->data, src->len);
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}
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static void rsi_init(struct cache_head *cnew, struct cache_head *citem)
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{
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struct rsi *new = container_of(cnew, struct rsi, h);
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struct rsi *item = container_of(citem, struct rsi, h);
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new->out_handle.data = NULL;
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new->out_handle.len = 0;
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new->out_token.data = NULL;
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new->out_token.len = 0;
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new->in_handle.len = item->in_handle.len;
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item->in_handle.len = 0;
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new->in_token.len = item->in_token.len;
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item->in_token.len = 0;
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new->in_handle.data = item->in_handle.data;
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item->in_handle.data = NULL;
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new->in_token.data = item->in_token.data;
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item->in_token.data = NULL;
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}
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static void update_rsi(struct cache_head *cnew, struct cache_head *citem)
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{
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struct rsi *new = container_of(cnew, struct rsi, h);
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struct rsi *item = container_of(citem, struct rsi, h);
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BUG_ON(new->out_handle.data || new->out_token.data);
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new->out_handle.len = item->out_handle.len;
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item->out_handle.len = 0;
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new->out_token.len = item->out_token.len;
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item->out_token.len = 0;
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new->out_handle.data = item->out_handle.data;
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item->out_handle.data = NULL;
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new->out_token.data = item->out_token.data;
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item->out_token.data = NULL;
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new->major_status = item->major_status;
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new->minor_status = item->minor_status;
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}
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static struct cache_head *rsi_alloc(void)
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{
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struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
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if (rsii)
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return &rsii->h;
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else
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return NULL;
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}
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static int rsi_upcall(struct cache_detail *cd, struct cache_head *h)
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{
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return sunrpc_cache_pipe_upcall_timeout(cd, h);
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}
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static void rsi_request(struct cache_detail *cd,
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struct cache_head *h,
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char **bpp, int *blen)
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{
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struct rsi *rsii = container_of(h, struct rsi, h);
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qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
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qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
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(*bpp)[-1] = '\n';
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WARN_ONCE(*blen < 0,
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"RPCSEC/GSS credential too large - please use gssproxy\n");
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}
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static int rsi_parse(struct cache_detail *cd,
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char *mesg, int mlen)
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{
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/* context token expiry major minor context token */
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char *buf = mesg;
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char *ep;
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int len;
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struct rsi rsii, *rsip = NULL;
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time64_t expiry;
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int status = -EINVAL;
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memset(&rsii, 0, sizeof(rsii));
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/* handle */
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len = qword_get(&mesg, buf, mlen);
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if (len < 0)
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goto out;
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status = -ENOMEM;
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if (dup_to_netobj(&rsii.in_handle, buf, len))
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goto out;
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/* token */
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len = qword_get(&mesg, buf, mlen);
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status = -EINVAL;
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if (len < 0)
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goto out;
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status = -ENOMEM;
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if (dup_to_netobj(&rsii.in_token, buf, len))
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goto out;
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rsip = rsi_lookup(cd, &rsii);
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if (!rsip)
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goto out;
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rsii.h.flags = 0;
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/* expiry */
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status = get_expiry(&mesg, &expiry);
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if (status)
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goto out;
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status = -EINVAL;
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/* major/minor */
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len = qword_get(&mesg, buf, mlen);
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if (len <= 0)
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goto out;
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rsii.major_status = simple_strtoul(buf, &ep, 10);
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if (*ep)
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goto out;
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len = qword_get(&mesg, buf, mlen);
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if (len <= 0)
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goto out;
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rsii.minor_status = simple_strtoul(buf, &ep, 10);
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if (*ep)
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goto out;
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/* out_handle */
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len = qword_get(&mesg, buf, mlen);
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if (len < 0)
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goto out;
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status = -ENOMEM;
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if (dup_to_netobj(&rsii.out_handle, buf, len))
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goto out;
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/* out_token */
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len = qword_get(&mesg, buf, mlen);
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status = -EINVAL;
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if (len < 0)
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goto out;
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status = -ENOMEM;
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if (dup_to_netobj(&rsii.out_token, buf, len))
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goto out;
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rsii.h.expiry_time = expiry;
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rsip = rsi_update(cd, &rsii, rsip);
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status = 0;
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out:
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rsi_free(&rsii);
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if (rsip)
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cache_put(&rsip->h, cd);
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else
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status = -ENOMEM;
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return status;
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}
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static const struct cache_detail rsi_cache_template = {
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.owner = THIS_MODULE,
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.hash_size = RSI_HASHMAX,
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.name = "auth.rpcsec.init",
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.cache_put = rsi_put,
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.cache_upcall = rsi_upcall,
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.cache_request = rsi_request,
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.cache_parse = rsi_parse,
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.match = rsi_match,
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.init = rsi_init,
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.update = update_rsi,
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.alloc = rsi_alloc,
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};
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static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item)
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{
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struct cache_head *ch;
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int hash = rsi_hash(item);
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ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
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if (ch)
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return container_of(ch, struct rsi, h);
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else
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return NULL;
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}
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static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
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{
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struct cache_head *ch;
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int hash = rsi_hash(new);
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ch = sunrpc_cache_update(cd, &new->h,
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&old->h, hash);
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if (ch)
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return container_of(ch, struct rsi, h);
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else
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return NULL;
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}
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|
|
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/*
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* The rpcsec_context cache is used to store a context that is
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* used in data exchange.
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* The key is a context handle. The content is:
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* uid, gidlist, mechanism, service-set, mech-specific-data
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*/
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#define RSC_HASHBITS 10
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#define RSC_HASHMAX (1<<RSC_HASHBITS)
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#define GSS_SEQ_WIN 128
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struct gss_svc_seq_data {
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/* highest seq number seen so far: */
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u32 sd_max;
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/* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
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* sd_win is nonzero iff sequence number i has been seen already: */
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unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
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spinlock_t sd_lock;
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};
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struct rsc {
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struct cache_head h;
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struct xdr_netobj handle;
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struct svc_cred cred;
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struct gss_svc_seq_data seqdata;
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struct gss_ctx *mechctx;
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struct rcu_head rcu_head;
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};
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static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
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static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
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static void rsc_free(struct rsc *rsci)
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{
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kfree(rsci->handle.data);
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if (rsci->mechctx)
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gss_delete_sec_context(&rsci->mechctx);
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free_svc_cred(&rsci->cred);
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}
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static void rsc_free_rcu(struct rcu_head *head)
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{
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struct rsc *rsci = container_of(head, struct rsc, rcu_head);
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kfree(rsci->handle.data);
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kfree(rsci);
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}
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static void rsc_put(struct kref *ref)
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{
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struct rsc *rsci = container_of(ref, struct rsc, h.ref);
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if (rsci->mechctx)
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gss_delete_sec_context(&rsci->mechctx);
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free_svc_cred(&rsci->cred);
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call_rcu(&rsci->rcu_head, rsc_free_rcu);
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}
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static inline int
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rsc_hash(struct rsc *rsci)
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{
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return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
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}
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|
|
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static int
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rsc_match(struct cache_head *a, struct cache_head *b)
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|
{
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struct rsc *new = container_of(a, struct rsc, h);
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struct rsc *tmp = container_of(b, struct rsc, h);
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return netobj_equal(&new->handle, &tmp->handle);
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}
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|
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static void
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rsc_init(struct cache_head *cnew, struct cache_head *ctmp)
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{
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struct rsc *new = container_of(cnew, struct rsc, h);
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struct rsc *tmp = container_of(ctmp, struct rsc, h);
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|
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new->handle.len = tmp->handle.len;
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tmp->handle.len = 0;
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new->handle.data = tmp->handle.data;
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tmp->handle.data = NULL;
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new->mechctx = NULL;
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init_svc_cred(&new->cred);
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}
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|
|
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static void
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update_rsc(struct cache_head *cnew, struct cache_head *ctmp)
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{
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struct rsc *new = container_of(cnew, struct rsc, h);
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struct rsc *tmp = container_of(ctmp, struct rsc, h);
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new->mechctx = tmp->mechctx;
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tmp->mechctx = NULL;
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memset(&new->seqdata, 0, sizeof(new->seqdata));
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spin_lock_init(&new->seqdata.sd_lock);
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new->cred = tmp->cred;
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init_svc_cred(&tmp->cred);
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}
|
|
|
|
static struct cache_head *
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rsc_alloc(void)
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|
{
|
|
struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
|
|
if (rsci)
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|
return &rsci->h;
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|
else
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return NULL;
|
|
}
|
|
|
|
static int rsc_upcall(struct cache_detail *cd, struct cache_head *h)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int rsc_parse(struct cache_detail *cd,
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|
char *mesg, int mlen)
|
|
{
|
|
/* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
|
|
char *buf = mesg;
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|
int id;
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|
int len, rv;
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struct rsc rsci, *rscp = NULL;
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|
time64_t expiry;
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|
int status = -EINVAL;
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|
struct gss_api_mech *gm = NULL;
|
|
|
|
memset(&rsci, 0, sizeof(rsci));
|
|
/* context handle */
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|
len = qword_get(&mesg, buf, mlen);
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|
if (len < 0) goto out;
|
|
status = -ENOMEM;
|
|
if (dup_to_netobj(&rsci.handle, buf, len))
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|
goto out;
|
|
|
|
rsci.h.flags = 0;
|
|
/* expiry */
|
|
status = get_expiry(&mesg, &expiry);
|
|
if (status)
|
|
goto out;
|
|
|
|
status = -EINVAL;
|
|
rscp = rsc_lookup(cd, &rsci);
|
|
if (!rscp)
|
|
goto out;
|
|
|
|
/* uid, or NEGATIVE */
|
|
rv = get_int(&mesg, &id);
|
|
if (rv == -EINVAL)
|
|
goto out;
|
|
if (rv == -ENOENT)
|
|
set_bit(CACHE_NEGATIVE, &rsci.h.flags);
|
|
else {
|
|
int N, i;
|
|
|
|
/*
|
|
* NOTE: we skip uid_valid()/gid_valid() checks here:
|
|
* instead, * -1 id's are later mapped to the
|
|
* (export-specific) anonymous id by nfsd_setuser.
|
|
*
|
|
* (But supplementary gid's get no such special
|
|
* treatment so are checked for validity here.)
|
|
*/
|
|
/* uid */
|
|
rsci.cred.cr_uid = make_kuid(current_user_ns(), id);
|
|
|
|
/* gid */
|
|
if (get_int(&mesg, &id))
|
|
goto out;
|
|
rsci.cred.cr_gid = make_kgid(current_user_ns(), id);
|
|
|
|
/* number of additional gid's */
|
|
if (get_int(&mesg, &N))
|
|
goto out;
|
|
if (N < 0 || N > NGROUPS_MAX)
|
|
goto out;
|
|
status = -ENOMEM;
|
|
rsci.cred.cr_group_info = groups_alloc(N);
|
|
if (rsci.cred.cr_group_info == NULL)
|
|
goto out;
|
|
|
|
/* gid's */
|
|
status = -EINVAL;
|
|
for (i=0; i<N; i++) {
|
|
kgid_t kgid;
|
|
if (get_int(&mesg, &id))
|
|
goto out;
|
|
kgid = make_kgid(current_user_ns(), id);
|
|
if (!gid_valid(kgid))
|
|
goto out;
|
|
rsci.cred.cr_group_info->gid[i] = kgid;
|
|
}
|
|
groups_sort(rsci.cred.cr_group_info);
|
|
|
|
/* mech name */
|
|
len = qword_get(&mesg, buf, mlen);
|
|
if (len < 0)
|
|
goto out;
|
|
gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
|
|
status = -EOPNOTSUPP;
|
|
if (!gm)
|
|
goto out;
|
|
|
|
status = -EINVAL;
|
|
/* mech-specific data: */
|
|
len = qword_get(&mesg, buf, mlen);
|
|
if (len < 0)
|
|
goto out;
|
|
status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
|
|
NULL, GFP_KERNEL);
|
|
if (status)
|
|
goto out;
|
|
|
|
/* get client name */
|
|
len = qword_get(&mesg, buf, mlen);
|
|
if (len > 0) {
|
|
rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
|
|
if (!rsci.cred.cr_principal) {
|
|
status = -ENOMEM;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
}
|
|
rsci.h.expiry_time = expiry;
|
|
rscp = rsc_update(cd, &rsci, rscp);
|
|
status = 0;
|
|
out:
|
|
rsc_free(&rsci);
|
|
if (rscp)
|
|
cache_put(&rscp->h, cd);
|
|
else
|
|
status = -ENOMEM;
|
|
return status;
|
|
}
|
|
|
|
static const struct cache_detail rsc_cache_template = {
|
|
.owner = THIS_MODULE,
|
|
.hash_size = RSC_HASHMAX,
|
|
.name = "auth.rpcsec.context",
|
|
.cache_put = rsc_put,
|
|
.cache_upcall = rsc_upcall,
|
|
.cache_parse = rsc_parse,
|
|
.match = rsc_match,
|
|
.init = rsc_init,
|
|
.update = update_rsc,
|
|
.alloc = rsc_alloc,
|
|
};
|
|
|
|
static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
|
|
{
|
|
struct cache_head *ch;
|
|
int hash = rsc_hash(item);
|
|
|
|
ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
|
|
if (ch)
|
|
return container_of(ch, struct rsc, h);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
|
|
{
|
|
struct cache_head *ch;
|
|
int hash = rsc_hash(new);
|
|
|
|
ch = sunrpc_cache_update(cd, &new->h,
|
|
&old->h, hash);
|
|
if (ch)
|
|
return container_of(ch, struct rsc, h);
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
|
|
static struct rsc *
|
|
gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
|
|
{
|
|
struct rsc rsci;
|
|
struct rsc *found;
|
|
|
|
memset(&rsci, 0, sizeof(rsci));
|
|
if (dup_to_netobj(&rsci.handle, handle->data, handle->len))
|
|
return NULL;
|
|
found = rsc_lookup(cd, &rsci);
|
|
rsc_free(&rsci);
|
|
if (!found)
|
|
return NULL;
|
|
if (cache_check(cd, &found->h, NULL))
|
|
return NULL;
|
|
return found;
|
|
}
|
|
|
|
/**
|
|
* gss_check_seq_num - GSS sequence number window check
|
|
* @rqstp: RPC Call to use when reporting errors
|
|
* @rsci: cached GSS context state (updated on return)
|
|
* @seq_num: sequence number to check
|
|
*
|
|
* Implements sequence number algorithm as specified in
|
|
* RFC 2203, Section 5.3.3.1. "Context Management".
|
|
*
|
|
* Return values:
|
|
* %true: @rqstp's GSS sequence number is inside the window
|
|
* %false: @rqstp's GSS sequence number is outside the window
|
|
*/
|
|
static bool gss_check_seq_num(const struct svc_rqst *rqstp, struct rsc *rsci,
|
|
u32 seq_num)
|
|
{
|
|
struct gss_svc_seq_data *sd = &rsci->seqdata;
|
|
bool result = false;
|
|
|
|
spin_lock(&sd->sd_lock);
|
|
if (seq_num > sd->sd_max) {
|
|
if (seq_num >= sd->sd_max + GSS_SEQ_WIN) {
|
|
memset(sd->sd_win, 0, sizeof(sd->sd_win));
|
|
sd->sd_max = seq_num;
|
|
} else while (sd->sd_max < seq_num) {
|
|
sd->sd_max++;
|
|
__clear_bit(sd->sd_max % GSS_SEQ_WIN, sd->sd_win);
|
|
}
|
|
__set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win);
|
|
goto ok;
|
|
} else if (seq_num + GSS_SEQ_WIN <= sd->sd_max) {
|
|
goto toolow;
|
|
}
|
|
if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
|
|
goto alreadyseen;
|
|
|
|
ok:
|
|
result = true;
|
|
out:
|
|
spin_unlock(&sd->sd_lock);
|
|
return result;
|
|
|
|
toolow:
|
|
trace_rpcgss_svc_seqno_low(rqstp, seq_num,
|
|
sd->sd_max - GSS_SEQ_WIN,
|
|
sd->sd_max);
|
|
goto out;
|
|
alreadyseen:
|
|
trace_rpcgss_svc_seqno_seen(rqstp, seq_num);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Decode and verify a Call's verifier field. For RPC_AUTH_GSS Calls,
|
|
* the body of this field contains a variable length checksum.
|
|
*
|
|
* GSS-specific auth_stat values are mandated by RFC 2203 Section
|
|
* 5.3.3.3.
|
|
*/
|
|
static int
|
|
svcauth_gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
|
|
__be32 *rpcstart, struct rpc_gss_wire_cred *gc)
|
|
{
|
|
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
|
|
struct gss_ctx *ctx_id = rsci->mechctx;
|
|
u32 flavor, maj_stat;
|
|
struct xdr_buf rpchdr;
|
|
struct xdr_netobj checksum;
|
|
struct kvec iov;
|
|
|
|
/*
|
|
* Compute the checksum of the incoming Call from the
|
|
* XID field to credential field:
|
|
*/
|
|
iov.iov_base = rpcstart;
|
|
iov.iov_len = (u8 *)xdr->p - (u8 *)rpcstart;
|
|
xdr_buf_from_iov(&iov, &rpchdr);
|
|
|
|
/* Call's verf field: */
|
|
if (xdr_stream_decode_opaque_auth(xdr, &flavor,
|
|
(void **)&checksum.data,
|
|
&checksum.len) < 0) {
|
|
rqstp->rq_auth_stat = rpc_autherr_badverf;
|
|
return SVC_DENIED;
|
|
}
|
|
if (flavor != RPC_AUTH_GSS) {
|
|
rqstp->rq_auth_stat = rpc_autherr_badverf;
|
|
return SVC_DENIED;
|
|
}
|
|
|
|
if (rqstp->rq_deferred)
|
|
return SVC_OK;
|
|
maj_stat = gss_verify_mic(ctx_id, &rpchdr, &checksum);
|
|
if (maj_stat != GSS_S_COMPLETE) {
|
|
trace_rpcgss_svc_mic(rqstp, maj_stat);
|
|
rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
|
|
return SVC_DENIED;
|
|
}
|
|
|
|
if (gc->gc_seq > MAXSEQ) {
|
|
trace_rpcgss_svc_seqno_large(rqstp, gc->gc_seq);
|
|
rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
|
|
return SVC_DENIED;
|
|
}
|
|
if (!gss_check_seq_num(rqstp, rsci, gc->gc_seq))
|
|
return SVC_DROP;
|
|
return SVC_OK;
|
|
}
|
|
|
|
/*
|
|
* Construct and encode a Reply's verifier field. The verifier's body
|
|
* field contains a variable-length checksum of the GSS sequence
|
|
* number.
|
|
*/
|
|
static bool
|
|
svcauth_gss_encode_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
|
|
{
|
|
struct gss_svc_data *gsd = rqstp->rq_auth_data;
|
|
u32 maj_stat;
|
|
struct xdr_buf verf_data;
|
|
struct xdr_netobj checksum;
|
|
struct kvec iov;
|
|
|
|
gsd->gsd_seq_num = cpu_to_be32(seq);
|
|
iov.iov_base = &gsd->gsd_seq_num;
|
|
iov.iov_len = XDR_UNIT;
|
|
xdr_buf_from_iov(&iov, &verf_data);
|
|
|
|
checksum.data = gsd->gsd_scratch;
|
|
maj_stat = gss_get_mic(ctx_id, &verf_data, &checksum);
|
|
if (maj_stat != GSS_S_COMPLETE)
|
|
goto bad_mic;
|
|
|
|
return xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream, RPC_AUTH_GSS,
|
|
checksum.data, checksum.len) > 0;
|
|
|
|
bad_mic:
|
|
trace_rpcgss_svc_get_mic(rqstp, maj_stat);
|
|
return false;
|
|
}
|
|
|
|
struct gss_domain {
|
|
struct auth_domain h;
|
|
u32 pseudoflavor;
|
|
};
|
|
|
|
static struct auth_domain *
|
|
find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
|
|
{
|
|
char *name;
|
|
|
|
name = gss_service_to_auth_domain_name(ctx->mech_type, svc);
|
|
if (!name)
|
|
return NULL;
|
|
return auth_domain_find(name);
|
|
}
|
|
|
|
static struct auth_ops svcauthops_gss;
|
|
|
|
u32 svcauth_gss_flavor(struct auth_domain *dom)
|
|
{
|
|
struct gss_domain *gd = container_of(dom, struct gss_domain, h);
|
|
|
|
return gd->pseudoflavor;
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
|
|
|
|
struct auth_domain *
|
|
svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
|
|
{
|
|
struct gss_domain *new;
|
|
struct auth_domain *test;
|
|
int stat = -ENOMEM;
|
|
|
|
new = kmalloc(sizeof(*new), GFP_KERNEL);
|
|
if (!new)
|
|
goto out;
|
|
kref_init(&new->h.ref);
|
|
new->h.name = kstrdup(name, GFP_KERNEL);
|
|
if (!new->h.name)
|
|
goto out_free_dom;
|
|
new->h.flavour = &svcauthops_gss;
|
|
new->pseudoflavor = pseudoflavor;
|
|
|
|
test = auth_domain_lookup(name, &new->h);
|
|
if (test != &new->h) {
|
|
pr_warn("svc: duplicate registration of gss pseudo flavour %s.\n",
|
|
name);
|
|
stat = -EADDRINUSE;
|
|
auth_domain_put(test);
|
|
goto out_free_name;
|
|
}
|
|
return test;
|
|
|
|
out_free_name:
|
|
kfree(new->h.name);
|
|
out_free_dom:
|
|
kfree(new);
|
|
out:
|
|
return ERR_PTR(stat);
|
|
}
|
|
EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
|
|
|
|
/*
|
|
* RFC 2203, Section 5.3.2.2
|
|
*
|
|
* struct rpc_gss_integ_data {
|
|
* opaque databody_integ<>;
|
|
* opaque checksum<>;
|
|
* };
|
|
*
|
|
* struct rpc_gss_data_t {
|
|
* unsigned int seq_num;
|
|
* proc_req_arg_t arg;
|
|
* };
|
|
*/
|
|
static noinline_for_stack int
|
|
svcauth_gss_unwrap_integ(struct svc_rqst *rqstp, u32 seq, struct gss_ctx *ctx)
|
|
{
|
|
struct gss_svc_data *gsd = rqstp->rq_auth_data;
|
|
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
|
|
u32 len, offset, seq_num, maj_stat;
|
|
struct xdr_buf *buf = xdr->buf;
|
|
struct xdr_buf databody_integ;
|
|
struct xdr_netobj checksum;
|
|
|
|
/* Did we already verify the signature on the original pass through? */
|
|
if (rqstp->rq_deferred)
|
|
return 0;
|
|
|
|
if (xdr_stream_decode_u32(xdr, &len) < 0)
|
|
goto unwrap_failed;
|
|
if (len & 3)
|
|
goto unwrap_failed;
|
|
offset = xdr_stream_pos(xdr);
|
|
if (xdr_buf_subsegment(buf, &databody_integ, offset, len))
|
|
goto unwrap_failed;
|
|
|
|
/*
|
|
* The xdr_stream now points to the @seq_num field. The next
|
|
* XDR data item is the @arg field, which contains the clear
|
|
* text RPC program payload. The checksum, which follows the
|
|
* @arg field, is located and decoded without updating the
|
|
* xdr_stream.
|
|
*/
|
|
|
|
offset += len;
|
|
if (xdr_decode_word(buf, offset, &checksum.len))
|
|
goto unwrap_failed;
|
|
if (checksum.len > sizeof(gsd->gsd_scratch))
|
|
goto unwrap_failed;
|
|
checksum.data = gsd->gsd_scratch;
|
|
if (read_bytes_from_xdr_buf(buf, offset + XDR_UNIT, checksum.data,
|
|
checksum.len))
|
|
goto unwrap_failed;
|
|
|
|
maj_stat = gss_verify_mic(ctx, &databody_integ, &checksum);
|
|
if (maj_stat != GSS_S_COMPLETE)
|
|
goto bad_mic;
|
|
|
|
/* The received seqno is protected by the checksum. */
|
|
if (xdr_stream_decode_u32(xdr, &seq_num) < 0)
|
|
goto unwrap_failed;
|
|
if (seq_num != seq)
|
|
goto bad_seqno;
|
|
|
|
xdr_truncate_decode(xdr, XDR_UNIT + checksum.len);
|
|
return 0;
|
|
|
|
unwrap_failed:
|
|
trace_rpcgss_svc_unwrap_failed(rqstp);
|
|
return -EINVAL;
|
|
bad_seqno:
|
|
trace_rpcgss_svc_seqno_bad(rqstp, seq, seq_num);
|
|
return -EINVAL;
|
|
bad_mic:
|
|
trace_rpcgss_svc_mic(rqstp, maj_stat);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* RFC 2203, Section 5.3.2.3
|
|
*
|
|
* struct rpc_gss_priv_data {
|
|
* opaque databody_priv<>
|
|
* };
|
|
*
|
|
* struct rpc_gss_data_t {
|
|
* unsigned int seq_num;
|
|
* proc_req_arg_t arg;
|
|
* };
|
|
*/
|
|
static noinline_for_stack int
|
|
svcauth_gss_unwrap_priv(struct svc_rqst *rqstp, u32 seq, struct gss_ctx *ctx)
|
|
{
|
|
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
|
|
u32 len, maj_stat, seq_num, offset;
|
|
struct xdr_buf *buf = xdr->buf;
|
|
unsigned int saved_len;
|
|
|
|
if (xdr_stream_decode_u32(xdr, &len) < 0)
|
|
goto unwrap_failed;
|
|
if (rqstp->rq_deferred) {
|
|
/* Already decrypted last time through! The sequence number
|
|
* check at out_seq is unnecessary but harmless: */
|
|
goto out_seq;
|
|
}
|
|
if (len > xdr_stream_remaining(xdr))
|
|
goto unwrap_failed;
|
|
offset = xdr_stream_pos(xdr);
|
|
|
|
saved_len = buf->len;
|
|
maj_stat = gss_unwrap(ctx, offset, offset + len, buf);
|
|
if (maj_stat != GSS_S_COMPLETE)
|
|
goto bad_unwrap;
|
|
xdr->nwords -= XDR_QUADLEN(saved_len - buf->len);
|
|
|
|
out_seq:
|
|
/* gss_unwrap() decrypted the sequence number. */
|
|
if (xdr_stream_decode_u32(xdr, &seq_num) < 0)
|
|
goto unwrap_failed;
|
|
if (seq_num != seq)
|
|
goto bad_seqno;
|
|
return 0;
|
|
|
|
unwrap_failed:
|
|
trace_rpcgss_svc_unwrap_failed(rqstp);
|
|
return -EINVAL;
|
|
bad_seqno:
|
|
trace_rpcgss_svc_seqno_bad(rqstp, seq, seq_num);
|
|
return -EINVAL;
|
|
bad_unwrap:
|
|
trace_rpcgss_svc_unwrap(rqstp, maj_stat);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static enum svc_auth_status
|
|
svcauth_gss_set_client(struct svc_rqst *rqstp)
|
|
{
|
|
struct gss_svc_data *svcdata = rqstp->rq_auth_data;
|
|
struct rsc *rsci = svcdata->rsci;
|
|
struct rpc_gss_wire_cred *gc = &svcdata->clcred;
|
|
int stat;
|
|
|
|
rqstp->rq_auth_stat = rpc_autherr_badcred;
|
|
|
|
/*
|
|
* A gss export can be specified either by:
|
|
* export *(sec=krb5,rw)
|
|
* or by
|
|
* export gss/krb5(rw)
|
|
* The latter is deprecated; but for backwards compatibility reasons
|
|
* the nfsd code will still fall back on trying it if the former
|
|
* doesn't work; so we try to make both available to nfsd, below.
|
|
*/
|
|
rqstp->rq_gssclient = find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
|
|
if (rqstp->rq_gssclient == NULL)
|
|
return SVC_DENIED;
|
|
stat = svcauth_unix_set_client(rqstp);
|
|
if (stat == SVC_DROP || stat == SVC_CLOSE)
|
|
return stat;
|
|
|
|
rqstp->rq_auth_stat = rpc_auth_ok;
|
|
return SVC_OK;
|
|
}
|
|
|
|
static bool
|
|
svcauth_gss_proc_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
|
|
struct xdr_netobj *out_handle, int *major_status,
|
|
u32 seq_num)
|
|
{
|
|
struct xdr_stream *xdr = &rqstp->rq_res_stream;
|
|
struct rsc *rsci;
|
|
bool rc;
|
|
|
|
if (*major_status != GSS_S_COMPLETE)
|
|
goto null_verifier;
|
|
rsci = gss_svc_searchbyctx(cd, out_handle);
|
|
if (rsci == NULL) {
|
|
*major_status = GSS_S_NO_CONTEXT;
|
|
goto null_verifier;
|
|
}
|
|
|
|
rc = svcauth_gss_encode_verf(rqstp, rsci->mechctx, seq_num);
|
|
cache_put(&rsci->h, cd);
|
|
return rc;
|
|
|
|
null_verifier:
|
|
return xdr_stream_encode_opaque_auth(xdr, RPC_AUTH_NULL, NULL, 0) > 0;
|
|
}
|
|
|
|
static void gss_free_in_token_pages(struct gssp_in_token *in_token)
|
|
{
|
|
int i;
|
|
|
|
i = 0;
|
|
while (in_token->pages[i])
|
|
put_page(in_token->pages[i++]);
|
|
kfree(in_token->pages);
|
|
in_token->pages = NULL;
|
|
}
|
|
|
|
static int gss_read_proxy_verf(struct svc_rqst *rqstp,
|
|
struct rpc_gss_wire_cred *gc,
|
|
struct xdr_netobj *in_handle,
|
|
struct gssp_in_token *in_token)
|
|
{
|
|
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
|
|
unsigned int length, pgto_offs, pgfrom_offs;
|
|
int pages, i, pgto, pgfrom;
|
|
size_t to_offs, from_offs;
|
|
u32 inlen;
|
|
|
|
if (dup_netobj(in_handle, &gc->gc_ctx))
|
|
return SVC_CLOSE;
|
|
|
|
/*
|
|
* RFC 2203 Section 5.2.2
|
|
*
|
|
* struct rpc_gss_init_arg {
|
|
* opaque gss_token<>;
|
|
* };
|
|
*/
|
|
if (xdr_stream_decode_u32(xdr, &inlen) < 0)
|
|
goto out_denied_free;
|
|
if (inlen > xdr_stream_remaining(xdr))
|
|
goto out_denied_free;
|
|
|
|
pages = DIV_ROUND_UP(inlen, PAGE_SIZE);
|
|
in_token->pages = kcalloc(pages + 1, sizeof(struct page *), GFP_KERNEL);
|
|
if (!in_token->pages)
|
|
goto out_denied_free;
|
|
in_token->page_base = 0;
|
|
in_token->page_len = inlen;
|
|
for (i = 0; i < pages; i++) {
|
|
in_token->pages[i] = alloc_page(GFP_KERNEL);
|
|
if (!in_token->pages[i]) {
|
|
gss_free_in_token_pages(in_token);
|
|
goto out_denied_free;
|
|
}
|
|
}
|
|
|
|
length = min_t(unsigned int, inlen, (char *)xdr->end - (char *)xdr->p);
|
|
memcpy(page_address(in_token->pages[0]), xdr->p, length);
|
|
inlen -= length;
|
|
|
|
to_offs = length;
|
|
from_offs = rqstp->rq_arg.page_base;
|
|
while (inlen) {
|
|
pgto = to_offs >> PAGE_SHIFT;
|
|
pgfrom = from_offs >> PAGE_SHIFT;
|
|
pgto_offs = to_offs & ~PAGE_MASK;
|
|
pgfrom_offs = from_offs & ~PAGE_MASK;
|
|
|
|
length = min_t(unsigned int, inlen,
|
|
min_t(unsigned int, PAGE_SIZE - pgto_offs,
|
|
PAGE_SIZE - pgfrom_offs));
|
|
memcpy(page_address(in_token->pages[pgto]) + pgto_offs,
|
|
page_address(rqstp->rq_arg.pages[pgfrom]) + pgfrom_offs,
|
|
length);
|
|
|
|
to_offs += length;
|
|
from_offs += length;
|
|
inlen -= length;
|
|
}
|
|
return 0;
|
|
|
|
out_denied_free:
|
|
kfree(in_handle->data);
|
|
return SVC_DENIED;
|
|
}
|
|
|
|
/*
|
|
* RFC 2203, Section 5.2.3.1.
|
|
*
|
|
* struct rpc_gss_init_res {
|
|
* opaque handle<>;
|
|
* unsigned int gss_major;
|
|
* unsigned int gss_minor;
|
|
* unsigned int seq_window;
|
|
* opaque gss_token<>;
|
|
* };
|
|
*/
|
|
static bool
|
|
svcxdr_encode_gss_init_res(struct xdr_stream *xdr,
|
|
struct xdr_netobj *handle,
|
|
struct xdr_netobj *gss_token,
|
|
unsigned int major_status,
|
|
unsigned int minor_status, u32 seq_num)
|
|
{
|
|
if (xdr_stream_encode_opaque(xdr, handle->data, handle->len) < 0)
|
|
return false;
|
|
if (xdr_stream_encode_u32(xdr, major_status) < 0)
|
|
return false;
|
|
if (xdr_stream_encode_u32(xdr, minor_status) < 0)
|
|
return false;
|
|
if (xdr_stream_encode_u32(xdr, seq_num) < 0)
|
|
return false;
|
|
if (xdr_stream_encode_opaque(xdr, gss_token->data, gss_token->len) < 0)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Having read the cred already and found we're in the context
|
|
* initiation case, read the verifier and initiate (or check the results
|
|
* of) upcalls to userspace for help with context initiation. If
|
|
* the upcall results are available, write the verifier and result.
|
|
* Otherwise, drop the request pending an answer to the upcall.
|
|
*/
|
|
static int
|
|
svcauth_gss_legacy_init(struct svc_rqst *rqstp,
|
|
struct rpc_gss_wire_cred *gc)
|
|
{
|
|
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
|
|
struct rsi *rsip, rsikey;
|
|
__be32 *p;
|
|
u32 len;
|
|
int ret;
|
|
struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
|
|
|
|
memset(&rsikey, 0, sizeof(rsikey));
|
|
if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx))
|
|
return SVC_CLOSE;
|
|
|
|
/*
|
|
* RFC 2203 Section 5.2.2
|
|
*
|
|
* struct rpc_gss_init_arg {
|
|
* opaque gss_token<>;
|
|
* };
|
|
*/
|
|
if (xdr_stream_decode_u32(xdr, &len) < 0) {
|
|
kfree(rsikey.in_handle.data);
|
|
return SVC_DENIED;
|
|
}
|
|
p = xdr_inline_decode(xdr, len);
|
|
if (!p) {
|
|
kfree(rsikey.in_handle.data);
|
|
return SVC_DENIED;
|
|
}
|
|
rsikey.in_token.data = kmalloc(len, GFP_KERNEL);
|
|
if (ZERO_OR_NULL_PTR(rsikey.in_token.data)) {
|
|
kfree(rsikey.in_handle.data);
|
|
return SVC_CLOSE;
|
|
}
|
|
memcpy(rsikey.in_token.data, p, len);
|
|
rsikey.in_token.len = len;
|
|
|
|
/* Perform upcall, or find upcall result: */
|
|
rsip = rsi_lookup(sn->rsi_cache, &rsikey);
|
|
rsi_free(&rsikey);
|
|
if (!rsip)
|
|
return SVC_CLOSE;
|
|
if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
|
|
/* No upcall result: */
|
|
return SVC_CLOSE;
|
|
|
|
ret = SVC_CLOSE;
|
|
if (!svcauth_gss_proc_init_verf(sn->rsc_cache, rqstp, &rsip->out_handle,
|
|
&rsip->major_status, GSS_SEQ_WIN))
|
|
goto out;
|
|
if (!svcxdr_set_accept_stat(rqstp))
|
|
goto out;
|
|
if (!svcxdr_encode_gss_init_res(&rqstp->rq_res_stream, &rsip->out_handle,
|
|
&rsip->out_token, rsip->major_status,
|
|
rsip->minor_status, GSS_SEQ_WIN))
|
|
goto out;
|
|
|
|
ret = SVC_COMPLETE;
|
|
out:
|
|
cache_put(&rsip->h, sn->rsi_cache);
|
|
return ret;
|
|
}
|
|
|
|
static int gss_proxy_save_rsc(struct cache_detail *cd,
|
|
struct gssp_upcall_data *ud,
|
|
uint64_t *handle)
|
|
{
|
|
struct rsc rsci, *rscp = NULL;
|
|
static atomic64_t ctxhctr;
|
|
long long ctxh;
|
|
struct gss_api_mech *gm = NULL;
|
|
time64_t expiry;
|
|
int status;
|
|
|
|
memset(&rsci, 0, sizeof(rsci));
|
|
/* context handle */
|
|
status = -ENOMEM;
|
|
/* the handle needs to be just a unique id,
|
|
* use a static counter */
|
|
ctxh = atomic64_inc_return(&ctxhctr);
|
|
|
|
/* make a copy for the caller */
|
|
*handle = ctxh;
|
|
|
|
/* make a copy for the rsc cache */
|
|
if (dup_to_netobj(&rsci.handle, (char *)handle, sizeof(uint64_t)))
|
|
goto out;
|
|
rscp = rsc_lookup(cd, &rsci);
|
|
if (!rscp)
|
|
goto out;
|
|
|
|
/* creds */
|
|
if (!ud->found_creds) {
|
|
/* userspace seem buggy, we should always get at least a
|
|
* mapping to nobody */
|
|
goto out;
|
|
} else {
|
|
struct timespec64 boot;
|
|
|
|
/* steal creds */
|
|
rsci.cred = ud->creds;
|
|
memset(&ud->creds, 0, sizeof(struct svc_cred));
|
|
|
|
status = -EOPNOTSUPP;
|
|
/* get mech handle from OID */
|
|
gm = gss_mech_get_by_OID(&ud->mech_oid);
|
|
if (!gm)
|
|
goto out;
|
|
rsci.cred.cr_gss_mech = gm;
|
|
|
|
status = -EINVAL;
|
|
/* mech-specific data: */
|
|
status = gss_import_sec_context(ud->out_handle.data,
|
|
ud->out_handle.len,
|
|
gm, &rsci.mechctx,
|
|
&expiry, GFP_KERNEL);
|
|
if (status)
|
|
goto out;
|
|
|
|
getboottime64(&boot);
|
|
expiry -= boot.tv_sec;
|
|
}
|
|
|
|
rsci.h.expiry_time = expiry;
|
|
rscp = rsc_update(cd, &rsci, rscp);
|
|
status = 0;
|
|
out:
|
|
rsc_free(&rsci);
|
|
if (rscp)
|
|
cache_put(&rscp->h, cd);
|
|
else
|
|
status = -ENOMEM;
|
|
return status;
|
|
}
|
|
|
|
static int svcauth_gss_proxy_init(struct svc_rqst *rqstp,
|
|
struct rpc_gss_wire_cred *gc)
|
|
{
|
|
struct xdr_netobj cli_handle;
|
|
struct gssp_upcall_data ud;
|
|
uint64_t handle;
|
|
int status;
|
|
int ret;
|
|
struct net *net = SVC_NET(rqstp);
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
|
|
memset(&ud, 0, sizeof(ud));
|
|
ret = gss_read_proxy_verf(rqstp, gc, &ud.in_handle, &ud.in_token);
|
|
if (ret)
|
|
return ret;
|
|
|
|
ret = SVC_CLOSE;
|
|
|
|
/* Perform synchronous upcall to gss-proxy */
|
|
status = gssp_accept_sec_context_upcall(net, &ud);
|
|
if (status)
|
|
goto out;
|
|
|
|
trace_rpcgss_svc_accept_upcall(rqstp, ud.major_status, ud.minor_status);
|
|
|
|
switch (ud.major_status) {
|
|
case GSS_S_CONTINUE_NEEDED:
|
|
cli_handle = ud.out_handle;
|
|
break;
|
|
case GSS_S_COMPLETE:
|
|
status = gss_proxy_save_rsc(sn->rsc_cache, &ud, &handle);
|
|
if (status)
|
|
goto out;
|
|
cli_handle.data = (u8 *)&handle;
|
|
cli_handle.len = sizeof(handle);
|
|
break;
|
|
default:
|
|
goto out;
|
|
}
|
|
|
|
if (!svcauth_gss_proc_init_verf(sn->rsc_cache, rqstp, &cli_handle,
|
|
&ud.major_status, GSS_SEQ_WIN))
|
|
goto out;
|
|
if (!svcxdr_set_accept_stat(rqstp))
|
|
goto out;
|
|
if (!svcxdr_encode_gss_init_res(&rqstp->rq_res_stream, &cli_handle,
|
|
&ud.out_token, ud.major_status,
|
|
ud.minor_status, GSS_SEQ_WIN))
|
|
goto out;
|
|
|
|
ret = SVC_COMPLETE;
|
|
out:
|
|
gss_free_in_token_pages(&ud.in_token);
|
|
gssp_free_upcall_data(&ud);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Try to set the sn->use_gss_proxy variable to a new value. We only allow
|
|
* it to be changed if it's currently undefined (-1). If it's any other value
|
|
* then return -EBUSY unless the type wouldn't have changed anyway.
|
|
*/
|
|
static int set_gss_proxy(struct net *net, int type)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
int ret;
|
|
|
|
WARN_ON_ONCE(type != 0 && type != 1);
|
|
ret = cmpxchg(&sn->use_gss_proxy, -1, type);
|
|
if (ret != -1 && ret != type)
|
|
return -EBUSY;
|
|
return 0;
|
|
}
|
|
|
|
static bool use_gss_proxy(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
|
|
/* If use_gss_proxy is still undefined, then try to disable it */
|
|
if (sn->use_gss_proxy == -1)
|
|
set_gss_proxy(net, 0);
|
|
return sn->use_gss_proxy;
|
|
}
|
|
|
|
static noinline_for_stack int
|
|
svcauth_gss_proc_init(struct svc_rqst *rqstp, struct rpc_gss_wire_cred *gc)
|
|
{
|
|
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
|
|
u32 flavor, len;
|
|
void *body;
|
|
|
|
/* Call's verf field: */
|
|
if (xdr_stream_decode_opaque_auth(xdr, &flavor, &body, &len) < 0)
|
|
return SVC_GARBAGE;
|
|
if (flavor != RPC_AUTH_NULL || len != 0) {
|
|
rqstp->rq_auth_stat = rpc_autherr_badverf;
|
|
return SVC_DENIED;
|
|
}
|
|
|
|
if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0) {
|
|
rqstp->rq_auth_stat = rpc_autherr_badcred;
|
|
return SVC_DENIED;
|
|
}
|
|
|
|
if (!use_gss_proxy(SVC_NET(rqstp)))
|
|
return svcauth_gss_legacy_init(rqstp, gc);
|
|
return svcauth_gss_proxy_init(rqstp, gc);
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static ssize_t write_gssp(struct file *file, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct net *net = pde_data(file_inode(file));
|
|
char tbuf[20];
|
|
unsigned long i;
|
|
int res;
|
|
|
|
if (*ppos || count > sizeof(tbuf)-1)
|
|
return -EINVAL;
|
|
if (copy_from_user(tbuf, buf, count))
|
|
return -EFAULT;
|
|
|
|
tbuf[count] = 0;
|
|
res = kstrtoul(tbuf, 0, &i);
|
|
if (res)
|
|
return res;
|
|
if (i != 1)
|
|
return -EINVAL;
|
|
res = set_gssp_clnt(net);
|
|
if (res)
|
|
return res;
|
|
res = set_gss_proxy(net, 1);
|
|
if (res)
|
|
return res;
|
|
return count;
|
|
}
|
|
|
|
static ssize_t read_gssp(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct net *net = pde_data(file_inode(file));
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
unsigned long p = *ppos;
|
|
char tbuf[10];
|
|
size_t len;
|
|
|
|
snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
|
|
len = strlen(tbuf);
|
|
if (p >= len)
|
|
return 0;
|
|
len -= p;
|
|
if (len > count)
|
|
len = count;
|
|
if (copy_to_user(buf, (void *)(tbuf+p), len))
|
|
return -EFAULT;
|
|
*ppos += len;
|
|
return len;
|
|
}
|
|
|
|
static const struct proc_ops use_gss_proxy_proc_ops = {
|
|
.proc_open = nonseekable_open,
|
|
.proc_write = write_gssp,
|
|
.proc_read = read_gssp,
|
|
};
|
|
|
|
static int create_use_gss_proxy_proc_entry(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
struct proc_dir_entry **p = &sn->use_gssp_proc;
|
|
|
|
sn->use_gss_proxy = -1;
|
|
*p = proc_create_data("use-gss-proxy", S_IFREG | 0600,
|
|
sn->proc_net_rpc,
|
|
&use_gss_proxy_proc_ops, net);
|
|
if (!*p)
|
|
return -ENOMEM;
|
|
init_gssp_clnt(sn);
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_use_gss_proxy_proc_entry(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
|
|
if (sn->use_gssp_proc) {
|
|
remove_proc_entry("use-gss-proxy", sn->proc_net_rpc);
|
|
clear_gssp_clnt(sn);
|
|
}
|
|
}
|
|
|
|
static ssize_t read_gss_krb5_enctypes(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct rpcsec_gss_oid oid = {
|
|
.len = 9,
|
|
.data = "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02",
|
|
};
|
|
struct gss_api_mech *mech;
|
|
ssize_t ret;
|
|
|
|
mech = gss_mech_get_by_OID(&oid);
|
|
if (!mech)
|
|
return 0;
|
|
if (!mech->gm_upcall_enctypes) {
|
|
gss_mech_put(mech);
|
|
return 0;
|
|
}
|
|
|
|
ret = simple_read_from_buffer(buf, count, ppos,
|
|
mech->gm_upcall_enctypes,
|
|
strlen(mech->gm_upcall_enctypes));
|
|
gss_mech_put(mech);
|
|
return ret;
|
|
}
|
|
|
|
static const struct proc_ops gss_krb5_enctypes_proc_ops = {
|
|
.proc_open = nonseekable_open,
|
|
.proc_read = read_gss_krb5_enctypes,
|
|
};
|
|
|
|
static int create_krb5_enctypes_proc_entry(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
|
|
sn->gss_krb5_enctypes =
|
|
proc_create_data("gss_krb5_enctypes", S_IFREG | 0444,
|
|
sn->proc_net_rpc, &gss_krb5_enctypes_proc_ops,
|
|
net);
|
|
return sn->gss_krb5_enctypes ? 0 : -ENOMEM;
|
|
}
|
|
|
|
static void destroy_krb5_enctypes_proc_entry(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
|
|
if (sn->gss_krb5_enctypes)
|
|
remove_proc_entry("gss_krb5_enctypes", sn->proc_net_rpc);
|
|
}
|
|
|
|
#else /* CONFIG_PROC_FS */
|
|
|
|
static int create_use_gss_proxy_proc_entry(struct net *net)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_use_gss_proxy_proc_entry(struct net *net) {}
|
|
|
|
static int create_krb5_enctypes_proc_entry(struct net *net)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void destroy_krb5_enctypes_proc_entry(struct net *net) {}
|
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
/*
|
|
* The Call's credential body should contain a struct rpc_gss_cred_t.
|
|
*
|
|
* RFC 2203 Section 5
|
|
*
|
|
* struct rpc_gss_cred_t {
|
|
* union switch (unsigned int version) {
|
|
* case RPCSEC_GSS_VERS_1:
|
|
* struct {
|
|
* rpc_gss_proc_t gss_proc;
|
|
* unsigned int seq_num;
|
|
* rpc_gss_service_t service;
|
|
* opaque handle<>;
|
|
* } rpc_gss_cred_vers_1_t;
|
|
* }
|
|
* };
|
|
*/
|
|
static bool
|
|
svcauth_gss_decode_credbody(struct xdr_stream *xdr,
|
|
struct rpc_gss_wire_cred *gc,
|
|
__be32 **rpcstart)
|
|
{
|
|
ssize_t handle_len;
|
|
u32 body_len;
|
|
__be32 *p;
|
|
|
|
p = xdr_inline_decode(xdr, XDR_UNIT);
|
|
if (!p)
|
|
return false;
|
|
/*
|
|
* start of rpc packet is 7 u32's back from here:
|
|
* xid direction rpcversion prog vers proc flavour
|
|
*/
|
|
*rpcstart = p - 7;
|
|
body_len = be32_to_cpup(p);
|
|
if (body_len > RPC_MAX_AUTH_SIZE)
|
|
return false;
|
|
|
|
/* struct rpc_gss_cred_t */
|
|
if (xdr_stream_decode_u32(xdr, &gc->gc_v) < 0)
|
|
return false;
|
|
if (xdr_stream_decode_u32(xdr, &gc->gc_proc) < 0)
|
|
return false;
|
|
if (xdr_stream_decode_u32(xdr, &gc->gc_seq) < 0)
|
|
return false;
|
|
if (xdr_stream_decode_u32(xdr, &gc->gc_svc) < 0)
|
|
return false;
|
|
handle_len = xdr_stream_decode_opaque_inline(xdr,
|
|
(void **)&gc->gc_ctx.data,
|
|
body_len);
|
|
if (handle_len < 0)
|
|
return false;
|
|
if (body_len != XDR_UNIT * 5 + xdr_align_size(handle_len))
|
|
return false;
|
|
|
|
gc->gc_ctx.len = handle_len;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* svcauth_gss_accept - Decode and validate incoming RPC_AUTH_GSS credential
|
|
* @rqstp: RPC transaction
|
|
*
|
|
* Return values:
|
|
* %SVC_OK: Success
|
|
* %SVC_COMPLETE: GSS context lifetime event
|
|
* %SVC_DENIED: Credential or verifier is not valid
|
|
* %SVC_GARBAGE: Failed to decode credential or verifier
|
|
* %SVC_CLOSE: Temporary failure
|
|
*
|
|
* The rqstp->rq_auth_stat field is also set (see RFCs 2203 and 5531).
|
|
*/
|
|
static enum svc_auth_status
|
|
svcauth_gss_accept(struct svc_rqst *rqstp)
|
|
{
|
|
struct gss_svc_data *svcdata = rqstp->rq_auth_data;
|
|
__be32 *rpcstart;
|
|
struct rpc_gss_wire_cred *gc;
|
|
struct rsc *rsci = NULL;
|
|
int ret;
|
|
struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
|
|
|
|
rqstp->rq_auth_stat = rpc_autherr_badcred;
|
|
if (!svcdata)
|
|
svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
|
|
if (!svcdata)
|
|
goto auth_err;
|
|
rqstp->rq_auth_data = svcdata;
|
|
svcdata->gsd_databody_offset = 0;
|
|
svcdata->rsci = NULL;
|
|
gc = &svcdata->clcred;
|
|
|
|
if (!svcauth_gss_decode_credbody(&rqstp->rq_arg_stream, gc, &rpcstart))
|
|
goto auth_err;
|
|
if (gc->gc_v != RPC_GSS_VERSION)
|
|
goto auth_err;
|
|
|
|
switch (gc->gc_proc) {
|
|
case RPC_GSS_PROC_INIT:
|
|
case RPC_GSS_PROC_CONTINUE_INIT:
|
|
if (rqstp->rq_proc != 0)
|
|
goto auth_err;
|
|
return svcauth_gss_proc_init(rqstp, gc);
|
|
case RPC_GSS_PROC_DESTROY:
|
|
if (rqstp->rq_proc != 0)
|
|
goto auth_err;
|
|
fallthrough;
|
|
case RPC_GSS_PROC_DATA:
|
|
rqstp->rq_auth_stat = rpcsec_gsserr_credproblem;
|
|
rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
|
|
if (!rsci)
|
|
goto auth_err;
|
|
switch (svcauth_gss_verify_header(rqstp, rsci, rpcstart, gc)) {
|
|
case SVC_OK:
|
|
break;
|
|
case SVC_DENIED:
|
|
goto auth_err;
|
|
case SVC_DROP:
|
|
goto drop;
|
|
}
|
|
break;
|
|
default:
|
|
if (rqstp->rq_proc != 0)
|
|
goto auth_err;
|
|
rqstp->rq_auth_stat = rpc_autherr_rejectedcred;
|
|
goto auth_err;
|
|
}
|
|
|
|
/* now act upon the command: */
|
|
switch (gc->gc_proc) {
|
|
case RPC_GSS_PROC_DESTROY:
|
|
if (!svcauth_gss_encode_verf(rqstp, rsci->mechctx, gc->gc_seq))
|
|
goto auth_err;
|
|
if (!svcxdr_set_accept_stat(rqstp))
|
|
goto auth_err;
|
|
/* Delete the entry from the cache_list and call cache_put */
|
|
sunrpc_cache_unhash(sn->rsc_cache, &rsci->h);
|
|
goto complete;
|
|
case RPC_GSS_PROC_DATA:
|
|
rqstp->rq_auth_stat = rpcsec_gsserr_ctxproblem;
|
|
if (!svcauth_gss_encode_verf(rqstp, rsci->mechctx, gc->gc_seq))
|
|
goto auth_err;
|
|
if (!svcxdr_set_accept_stat(rqstp))
|
|
goto auth_err;
|
|
svcdata->gsd_databody_offset = xdr_stream_pos(&rqstp->rq_res_stream);
|
|
rqstp->rq_cred = rsci->cred;
|
|
get_group_info(rsci->cred.cr_group_info);
|
|
rqstp->rq_auth_stat = rpc_autherr_badcred;
|
|
switch (gc->gc_svc) {
|
|
case RPC_GSS_SVC_NONE:
|
|
break;
|
|
case RPC_GSS_SVC_INTEGRITY:
|
|
/* placeholders for body length and seq. number: */
|
|
xdr_reserve_space(&rqstp->rq_res_stream, XDR_UNIT * 2);
|
|
if (svcauth_gss_unwrap_integ(rqstp, gc->gc_seq,
|
|
rsci->mechctx))
|
|
goto garbage_args;
|
|
svcxdr_set_auth_slack(rqstp, RPC_MAX_AUTH_SIZE);
|
|
break;
|
|
case RPC_GSS_SVC_PRIVACY:
|
|
/* placeholders for body length and seq. number: */
|
|
xdr_reserve_space(&rqstp->rq_res_stream, XDR_UNIT * 2);
|
|
if (svcauth_gss_unwrap_priv(rqstp, gc->gc_seq,
|
|
rsci->mechctx))
|
|
goto garbage_args;
|
|
svcxdr_set_auth_slack(rqstp, RPC_MAX_AUTH_SIZE * 2);
|
|
break;
|
|
default:
|
|
goto auth_err;
|
|
}
|
|
svcdata->rsci = rsci;
|
|
cache_get(&rsci->h);
|
|
rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
|
|
rsci->mechctx->mech_type,
|
|
GSS_C_QOP_DEFAULT,
|
|
gc->gc_svc);
|
|
ret = SVC_OK;
|
|
trace_rpcgss_svc_authenticate(rqstp, gc);
|
|
goto out;
|
|
}
|
|
garbage_args:
|
|
ret = SVC_GARBAGE;
|
|
goto out;
|
|
auth_err:
|
|
xdr_truncate_encode(&rqstp->rq_res_stream, XDR_UNIT * 2);
|
|
ret = SVC_DENIED;
|
|
goto out;
|
|
complete:
|
|
ret = SVC_COMPLETE;
|
|
goto out;
|
|
drop:
|
|
ret = SVC_CLOSE;
|
|
out:
|
|
if (rsci)
|
|
cache_put(&rsci->h, sn->rsc_cache);
|
|
return ret;
|
|
}
|
|
|
|
static u32
|
|
svcauth_gss_prepare_to_wrap(struct svc_rqst *rqstp, struct gss_svc_data *gsd)
|
|
{
|
|
u32 offset;
|
|
|
|
/* Release can be called twice, but we only wrap once. */
|
|
offset = gsd->gsd_databody_offset;
|
|
gsd->gsd_databody_offset = 0;
|
|
|
|
/* AUTH_ERROR replies are not wrapped. */
|
|
if (rqstp->rq_auth_stat != rpc_auth_ok)
|
|
return 0;
|
|
|
|
/* Also don't wrap if the accept_stat is nonzero: */
|
|
if (*rqstp->rq_accept_statp != rpc_success)
|
|
return 0;
|
|
|
|
return offset;
|
|
}
|
|
|
|
/*
|
|
* RFC 2203, Section 5.3.2.2
|
|
*
|
|
* struct rpc_gss_integ_data {
|
|
* opaque databody_integ<>;
|
|
* opaque checksum<>;
|
|
* };
|
|
*
|
|
* struct rpc_gss_data_t {
|
|
* unsigned int seq_num;
|
|
* proc_req_arg_t arg;
|
|
* };
|
|
*
|
|
* The RPC Reply message has already been XDR-encoded. rq_res_stream
|
|
* is now positioned so that the checksum can be written just past
|
|
* the RPC Reply message.
|
|
*/
|
|
static int svcauth_gss_wrap_integ(struct svc_rqst *rqstp)
|
|
{
|
|
struct gss_svc_data *gsd = rqstp->rq_auth_data;
|
|
struct xdr_stream *xdr = &rqstp->rq_res_stream;
|
|
struct rpc_gss_wire_cred *gc = &gsd->clcred;
|
|
struct xdr_buf *buf = xdr->buf;
|
|
struct xdr_buf databody_integ;
|
|
struct xdr_netobj checksum;
|
|
u32 offset, maj_stat;
|
|
|
|
offset = svcauth_gss_prepare_to_wrap(rqstp, gsd);
|
|
if (!offset)
|
|
goto out;
|
|
|
|
if (xdr_buf_subsegment(buf, &databody_integ, offset + XDR_UNIT,
|
|
buf->len - offset - XDR_UNIT))
|
|
goto wrap_failed;
|
|
/* Buffer space for these has already been reserved in
|
|
* svcauth_gss_accept(). */
|
|
if (xdr_encode_word(buf, offset, databody_integ.len))
|
|
goto wrap_failed;
|
|
if (xdr_encode_word(buf, offset + XDR_UNIT, gc->gc_seq))
|
|
goto wrap_failed;
|
|
|
|
checksum.data = gsd->gsd_scratch;
|
|
maj_stat = gss_get_mic(gsd->rsci->mechctx, &databody_integ, &checksum);
|
|
if (maj_stat != GSS_S_COMPLETE)
|
|
goto bad_mic;
|
|
|
|
if (xdr_stream_encode_opaque(xdr, checksum.data, checksum.len) < 0)
|
|
goto wrap_failed;
|
|
xdr_commit_encode(xdr);
|
|
|
|
out:
|
|
return 0;
|
|
|
|
bad_mic:
|
|
trace_rpcgss_svc_get_mic(rqstp, maj_stat);
|
|
return -EINVAL;
|
|
wrap_failed:
|
|
trace_rpcgss_svc_wrap_failed(rqstp);
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* RFC 2203, Section 5.3.2.3
|
|
*
|
|
* struct rpc_gss_priv_data {
|
|
* opaque databody_priv<>
|
|
* };
|
|
*
|
|
* struct rpc_gss_data_t {
|
|
* unsigned int seq_num;
|
|
* proc_req_arg_t arg;
|
|
* };
|
|
*
|
|
* gss_wrap() expands the size of the RPC message payload in the
|
|
* response buffer. The main purpose of svcauth_gss_wrap_priv()
|
|
* is to ensure there is adequate space in the response buffer to
|
|
* avoid overflow during the wrap.
|
|
*/
|
|
static int svcauth_gss_wrap_priv(struct svc_rqst *rqstp)
|
|
{
|
|
struct gss_svc_data *gsd = rqstp->rq_auth_data;
|
|
struct rpc_gss_wire_cred *gc = &gsd->clcred;
|
|
struct xdr_buf *buf = &rqstp->rq_res;
|
|
struct kvec *head = buf->head;
|
|
struct kvec *tail = buf->tail;
|
|
u32 offset, pad, maj_stat;
|
|
__be32 *p;
|
|
|
|
offset = svcauth_gss_prepare_to_wrap(rqstp, gsd);
|
|
if (!offset)
|
|
return 0;
|
|
|
|
/*
|
|
* Buffer space for this field has already been reserved
|
|
* in svcauth_gss_accept(). Note that the GSS sequence
|
|
* number is encrypted along with the RPC reply payload.
|
|
*/
|
|
if (xdr_encode_word(buf, offset + XDR_UNIT, gc->gc_seq))
|
|
goto wrap_failed;
|
|
|
|
/*
|
|
* If there is currently tail data, make sure there is
|
|
* room for the head, tail, and 2 * RPC_MAX_AUTH_SIZE in
|
|
* the page, and move the current tail data such that
|
|
* there is RPC_MAX_AUTH_SIZE slack space available in
|
|
* both the head and tail.
|
|
*/
|
|
if (tail->iov_base) {
|
|
if (tail->iov_base >= head->iov_base + PAGE_SIZE)
|
|
goto wrap_failed;
|
|
if (tail->iov_base < head->iov_base)
|
|
goto wrap_failed;
|
|
if (tail->iov_len + head->iov_len
|
|
+ 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
|
|
goto wrap_failed;
|
|
memmove(tail->iov_base + RPC_MAX_AUTH_SIZE, tail->iov_base,
|
|
tail->iov_len);
|
|
tail->iov_base += RPC_MAX_AUTH_SIZE;
|
|
}
|
|
/*
|
|
* If there is no current tail data, make sure there is
|
|
* room for the head data, and 2 * RPC_MAX_AUTH_SIZE in the
|
|
* allotted page, and set up tail information such that there
|
|
* is RPC_MAX_AUTH_SIZE slack space available in both the
|
|
* head and tail.
|
|
*/
|
|
if (!tail->iov_base) {
|
|
if (head->iov_len + 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
|
|
goto wrap_failed;
|
|
tail->iov_base = head->iov_base
|
|
+ head->iov_len + RPC_MAX_AUTH_SIZE;
|
|
tail->iov_len = 0;
|
|
}
|
|
|
|
maj_stat = gss_wrap(gsd->rsci->mechctx, offset + XDR_UNIT, buf,
|
|
buf->pages);
|
|
if (maj_stat != GSS_S_COMPLETE)
|
|
goto bad_wrap;
|
|
|
|
/* Wrapping can change the size of databody_priv. */
|
|
if (xdr_encode_word(buf, offset, buf->len - offset - XDR_UNIT))
|
|
goto wrap_failed;
|
|
pad = xdr_pad_size(buf->len - offset - XDR_UNIT);
|
|
p = (__be32 *)(tail->iov_base + tail->iov_len);
|
|
memset(p, 0, pad);
|
|
tail->iov_len += pad;
|
|
buf->len += pad;
|
|
|
|
return 0;
|
|
wrap_failed:
|
|
trace_rpcgss_svc_wrap_failed(rqstp);
|
|
return -EINVAL;
|
|
bad_wrap:
|
|
trace_rpcgss_svc_wrap(rqstp, maj_stat);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
/**
|
|
* svcauth_gss_release - Wrap payload and release resources
|
|
* @rqstp: RPC transaction context
|
|
*
|
|
* Return values:
|
|
* %0: the Reply is ready to be sent
|
|
* %-ENOMEM: failed to allocate memory
|
|
* %-EINVAL: encoding error
|
|
*/
|
|
static int
|
|
svcauth_gss_release(struct svc_rqst *rqstp)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(SVC_NET(rqstp), sunrpc_net_id);
|
|
struct gss_svc_data *gsd = rqstp->rq_auth_data;
|
|
struct rpc_gss_wire_cred *gc;
|
|
int stat;
|
|
|
|
if (!gsd)
|
|
goto out;
|
|
gc = &gsd->clcred;
|
|
if (gc->gc_proc != RPC_GSS_PROC_DATA)
|
|
goto out;
|
|
|
|
switch (gc->gc_svc) {
|
|
case RPC_GSS_SVC_NONE:
|
|
break;
|
|
case RPC_GSS_SVC_INTEGRITY:
|
|
stat = svcauth_gss_wrap_integ(rqstp);
|
|
if (stat)
|
|
goto out_err;
|
|
break;
|
|
case RPC_GSS_SVC_PRIVACY:
|
|
stat = svcauth_gss_wrap_priv(rqstp);
|
|
if (stat)
|
|
goto out_err;
|
|
break;
|
|
/*
|
|
* For any other gc_svc value, svcauth_gss_accept() already set
|
|
* the auth_error appropriately; just fall through:
|
|
*/
|
|
}
|
|
|
|
out:
|
|
stat = 0;
|
|
out_err:
|
|
if (rqstp->rq_client)
|
|
auth_domain_put(rqstp->rq_client);
|
|
rqstp->rq_client = NULL;
|
|
if (rqstp->rq_gssclient)
|
|
auth_domain_put(rqstp->rq_gssclient);
|
|
rqstp->rq_gssclient = NULL;
|
|
if (rqstp->rq_cred.cr_group_info)
|
|
put_group_info(rqstp->rq_cred.cr_group_info);
|
|
rqstp->rq_cred.cr_group_info = NULL;
|
|
if (gsd && gsd->rsci) {
|
|
cache_put(&gsd->rsci->h, sn->rsc_cache);
|
|
gsd->rsci = NULL;
|
|
}
|
|
return stat;
|
|
}
|
|
|
|
static void
|
|
svcauth_gss_domain_release_rcu(struct rcu_head *head)
|
|
{
|
|
struct auth_domain *dom = container_of(head, struct auth_domain, rcu_head);
|
|
struct gss_domain *gd = container_of(dom, struct gss_domain, h);
|
|
|
|
kfree(dom->name);
|
|
kfree(gd);
|
|
}
|
|
|
|
static void
|
|
svcauth_gss_domain_release(struct auth_domain *dom)
|
|
{
|
|
call_rcu(&dom->rcu_head, svcauth_gss_domain_release_rcu);
|
|
}
|
|
|
|
static rpc_authflavor_t svcauth_gss_pseudoflavor(struct svc_rqst *rqstp)
|
|
{
|
|
return svcauth_gss_flavor(rqstp->rq_gssclient);
|
|
}
|
|
|
|
static struct auth_ops svcauthops_gss = {
|
|
.name = "rpcsec_gss",
|
|
.owner = THIS_MODULE,
|
|
.flavour = RPC_AUTH_GSS,
|
|
.accept = svcauth_gss_accept,
|
|
.release = svcauth_gss_release,
|
|
.domain_release = svcauth_gss_domain_release,
|
|
.set_client = svcauth_gss_set_client,
|
|
.pseudoflavor = svcauth_gss_pseudoflavor,
|
|
};
|
|
|
|
static int rsi_cache_create_net(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
struct cache_detail *cd;
|
|
int err;
|
|
|
|
cd = cache_create_net(&rsi_cache_template, net);
|
|
if (IS_ERR(cd))
|
|
return PTR_ERR(cd);
|
|
err = cache_register_net(cd, net);
|
|
if (err) {
|
|
cache_destroy_net(cd, net);
|
|
return err;
|
|
}
|
|
sn->rsi_cache = cd;
|
|
return 0;
|
|
}
|
|
|
|
static void rsi_cache_destroy_net(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
struct cache_detail *cd = sn->rsi_cache;
|
|
|
|
sn->rsi_cache = NULL;
|
|
cache_purge(cd);
|
|
cache_unregister_net(cd, net);
|
|
cache_destroy_net(cd, net);
|
|
}
|
|
|
|
static int rsc_cache_create_net(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
struct cache_detail *cd;
|
|
int err;
|
|
|
|
cd = cache_create_net(&rsc_cache_template, net);
|
|
if (IS_ERR(cd))
|
|
return PTR_ERR(cd);
|
|
err = cache_register_net(cd, net);
|
|
if (err) {
|
|
cache_destroy_net(cd, net);
|
|
return err;
|
|
}
|
|
sn->rsc_cache = cd;
|
|
return 0;
|
|
}
|
|
|
|
static void rsc_cache_destroy_net(struct net *net)
|
|
{
|
|
struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
|
|
struct cache_detail *cd = sn->rsc_cache;
|
|
|
|
sn->rsc_cache = NULL;
|
|
cache_purge(cd);
|
|
cache_unregister_net(cd, net);
|
|
cache_destroy_net(cd, net);
|
|
}
|
|
|
|
int
|
|
gss_svc_init_net(struct net *net)
|
|
{
|
|
int rv;
|
|
|
|
rv = rsc_cache_create_net(net);
|
|
if (rv)
|
|
return rv;
|
|
rv = rsi_cache_create_net(net);
|
|
if (rv)
|
|
goto out1;
|
|
rv = create_use_gss_proxy_proc_entry(net);
|
|
if (rv)
|
|
goto out2;
|
|
|
|
rv = create_krb5_enctypes_proc_entry(net);
|
|
if (rv)
|
|
goto out3;
|
|
|
|
return 0;
|
|
|
|
out3:
|
|
destroy_use_gss_proxy_proc_entry(net);
|
|
out2:
|
|
rsi_cache_destroy_net(net);
|
|
out1:
|
|
rsc_cache_destroy_net(net);
|
|
return rv;
|
|
}
|
|
|
|
void
|
|
gss_svc_shutdown_net(struct net *net)
|
|
{
|
|
destroy_krb5_enctypes_proc_entry(net);
|
|
destroy_use_gss_proxy_proc_entry(net);
|
|
rsi_cache_destroy_net(net);
|
|
rsc_cache_destroy_net(net);
|
|
}
|
|
|
|
int
|
|
gss_svc_init(void)
|
|
{
|
|
return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
|
|
}
|
|
|
|
void
|
|
gss_svc_shutdown(void)
|
|
{
|
|
svc_auth_unregister(RPC_AUTH_GSS);
|
|
}
|