/*
* Neil Brown <neilb@cse.unsw.edu.au>
* J. Bruce Fields <bfields@umich.edu>
* Andy Adamson <andros@umich.edu>
* Dug Song <dugsong@monkey.org>
*
* RPCSEC_GSS server authentication.
* This implements RPCSEC_GSS as defined in rfc2203 (rpcsec_gss) and rfc2078
* (gssapi)
*
* The RPCSEC_GSS involves three stages:
* 1/ context creation
* 2/ data exchange
* 3/ context destruction
*
* Context creation is handled largely by upcalls to user-space.
* In particular, GSS_Accept_sec_context is handled by an upcall
* Data exchange is handled entirely within the kernel
* In particular, GSS_GetMIC, GSS_VerifyMIC, GSS_Seal, GSS_Unseal are in-kernel.
* Context destruction is handled in-kernel
* GSS_Delete_sec_context is in-kernel
*
* Context creation is initiated by a RPCSEC_GSS_INIT request arriving.
* The context handle and gss_token are used as a key into the rpcsec_init cache.
* The content of this cache includes some of the outputs of GSS_Accept_sec_context,
* being major_status, minor_status, context_handle, reply_token.
* These are sent back to the client.
* Sequence window management is handled by the kernel. The window size if currently
* a compile time constant.
*
* When user-space is happy that a context is established, it places an entry
* in the rpcsec_context cache. The key for this cache is the context_handle.
* The content includes:
* uid/gidlist - for determining access rights
* mechanism type
* mechanism specific information, such as a key
*
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/pagemap.h>
#include <linux/sunrpc/auth_gss.h>
#include <linux/sunrpc/svcauth.h>
#include <linux/sunrpc/gss_err.h>
#include <linux/sunrpc/svcauth.h>
#include <linux/sunrpc/svcauth_gss.h>
#include <linux/sunrpc/cache.h>
#ifdef RPC_DEBUG
# define RPCDBG_FACILITY RPCDBG_AUTH
#endif
/* The rpcsec_init cache is used for mapping RPCSEC_GSS_{,CONT_}INIT requests
* into replies.
*
* Key is context handle (\x if empty) and gss_token.
* Content is major_status minor_status (integers) context_handle, reply_token.
*
*/
static int netobj_equal(struct xdr_netobj *a, struct xdr_netobj *b)
{
return a->len == b->len && 0 == memcmp(a->data, b->data, a->len);
}
#define RSI_HASHBITS 6
#define RSI_HASHMAX (1<<RSI_HASHBITS)
#define RSI_HASHMASK (RSI_HASHMAX-1)
struct rsi {
struct cache_head h;
struct xdr_netobj in_handle, in_token;
struct xdr_netobj out_handle, out_token;
int major_status, minor_status;
};
static struct cache_head *rsi_table[RSI_HASHMAX];
static struct cache_detail rsi_cache;
static struct rsi *rsi_lookup(struct rsi *item, int set);
static void rsi_free(struct rsi *rsii)
{
kfree(rsii->in_handle.data);
kfree(rsii->in_token.data);
kfree(rsii->out_handle.data);
kfree(rsii->out_token.data);
}
static void rsi_put(struct cache_head *item, struct cache_detail *cd)
{
struct rsi *rsii = container_of(item, struct rsi, h);
if (cache_put(item, cd)) {
rsi_free(rsii);
kfree(rsii);
}
}
static inline int rsi_hash(struct rsi *item)
{
return hash_mem(item->in_handle.data, item->in_handle.len, RSI_HASHBITS)
^ hash_mem(item->in_token.data, item->in_token.len, RSI_HASHBITS);
}
static inline int rsi_match(struct rsi *item, struct rsi *tmp)
{
return netobj_equal(&item->in_handle, &tmp->in_handle)
&& netobj_equal(&item->in_token, &tmp->in_token);
}
static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
{
dst->len = len;
dst->data = (len ? kmalloc(len, GFP_KERNEL) : NULL);
if (dst->data)
memcpy(dst->data, src, len);
if (len && !dst->data)
return -ENOMEM;
return 0;
}
static inline int dup_netobj(struct xdr_netobj *dst, struct xdr_netobj *src)
{
return dup_to_netobj(dst, src->data, src->len);
}
static inline void rsi_init(struct rsi *new, struct rsi *item)
{
new->out_handle.data = NULL;
new->out_handle.len = 0;
new->out_token.data = NULL;
new->out_token.len = 0;
new->in_handle.len = item->in_handle.len;
item->in_handle.len = 0;
new->in_token.len = item->in_token.len;
item->in_token.len = 0;
new->in_handle.data = item->in_handle.data;
item->in_handle.data = NULL;
new->in_token.data = item->in_token.data;
item->in_token.data = NULL;
}
static inline void rsi_update(struct rsi *new, struct rsi *item)
{
BUG_ON(new->out_handle.data || new->out_token.data);
new->out_handle.len = item->out_handle.len;
item->out_handle.len = 0;
new->out_token.len = item->out_token.len;
item->out_token.len = 0;
new->out_handle.data = item->out_handle.data;
item->out_handle.data = NULL;
new->out_token.data = item->out_token.data;
item->out_token.data = NULL;
new->major_status = item->major_status;
new->minor_status = item->minor_status;
}
static void rsi_request(struct cache_detail *cd,
struct cache_head *h,
char **bpp, int *blen)
{
struct rsi *rsii = container_of(h, struct rsi, h);
qword_addhex(bpp, blen, rsii->in_handle.data, rsii->in_handle.len);
qword_addhex(bpp, blen, rsii->in_token.data, rsii->in_token.len);
(*bpp)[-1] = '\n';
}
static int rsi_parse(struct cache_detail *cd,
char *mesg, int mlen)
{
/* context token expiry major minor context token */
char *buf = mesg;
char *ep;
int len;
struct rsi rsii, *rsip = NULL;
time_t expiry;
int status = -EINVAL;
memset(&rsii, 0, sizeof(rsii));
/* handle */
len = qword_get(&mesg, buf, mlen);
if (len < 0)
goto out;
status = -ENOMEM;
if (dup_to_netobj(&rsii.in_handle, buf, len))
goto out;
/* token */
len = qword_get(&mesg, buf, mlen);
status = -EINVAL;
if (len < 0)
goto out;;
status = -ENOMEM;
if (dup_to_netobj(&rsii.in_token, buf, len))
goto out;
rsii.h.flags = 0;
/* expiry */
expiry = get_expiry(&mesg);
status = -EINVAL;
if (expiry == 0)
goto out;
/* major/minor */
len = qword_get(&mesg, buf, mlen);
if (len < 0)
goto out;
if (len == 0) {
goto out;
} else {
rsii.major_status = simple_strtoul(buf, &ep, 10);
if (*ep)
goto out;
len = qword_get(&mesg, buf, mlen);
if (len <= 0)
goto out;
rsii.minor_status = simple_strtoul(buf, &ep, 10);
if (*ep)
goto out;
/* out_handle */
len = qword_get(&mesg, buf, mlen);
if (len < 0)
goto out;
status = -ENOMEM;
if (dup_to_netobj(&rsii.out_handle, buf, len))
goto out;
/* out_token */
len = qword_get(&mesg, buf, mlen);
status = -EINVAL;
if (len < 0)
goto out;
status = -ENOMEM;
if (dup_to_netobj(&rsii.out_token, buf, len))
goto out;
}
rsii.h.expiry_time = expiry;
rsip = rsi_lookup(&rsii, 1);
status = 0;
out:
rsi_free(&rsii);
if (rsip)
rsi_put(&rsip->h, &rsi_cache);
return status;
}
static struct cache_detail rsi_cache = {
.hash_size = RSI_HASHMAX,
.hash_table = rsi_table,
.name = "auth.rpcsec.init",
.cache_put = rsi_put,
.cache_request = rsi_request,
.cache_parse = rsi_parse,
};
static DefineSimpleCacheLookup(rsi, 0)
/*
* The rpcsec_context cache is used to store a context that is
* used in data exchange.
* The key is a context handle. The content is:
* uid, gidlist, mechanism, service-set, mech-specific-data
*/
#define RSC_HASHBITS 10
#define RSC_HASHMAX (1<<RSC_HASHBITS)
#define RSC_HASHMASK (RSC_HASHMAX-1)
#define GSS_SEQ_WIN 128
struct gss_svc_seq_data {
/* highest seq number seen so far: */
int sd_max;
/* for i such that sd_max-GSS_SEQ_WIN < i <= sd_max, the i-th bit of
* sd_win is nonzero iff sequence number i has been seen already: */
unsigned long sd_win[GSS_SEQ_WIN/BITS_PER_LONG];
spinlock_t sd_lock;
};
struct rsc {
struct cache_head h;
struct xdr_netobj handle;
struct svc_cred cred;
struct gss_svc_seq_data seqdata;
struct gss_ctx *mechctx;
};
static struct cache_head *rsc_table[RSC_HASHMAX];
static struct cache_detail rsc_cache;
static struct rsc *rsc_lookup(struct rsc *item, int set);
static void rsc_free(struct rsc *rsci)
{
kfree(rsci->handle.data);
if (rsci->mechctx)
gss_delete_sec_context(&rsci->mechctx);
if (rsci->cred.cr_group_info)
put_group_info(rsci->cred.cr_group_info);
}
static void rsc_put(struct cache_head *item, struct cache_detail *cd)
{
struct rsc *rsci = container_of(item, struct rsc, h);
if (cache_put(item, cd)) {
rsc_free(rsci);
kfree(rsci);
}
}
static inline int
rsc_hash(struct rsc *rsci)
{
return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
}
static inline int
rsc_match(struct rsc *new, struct rsc *tmp)
{
return netobj_equal(&new->handle, &tmp->handle);
}
static inline void
rsc_init(struct rsc *new, struct rsc *tmp)
{
new->handle.len = tmp->handle.len;
tmp->handle.len = 0;
new->handle.data = tmp->handle.data;
tmp->handle.data = NULL;
new->mechctx = NULL;
}
static inline void
rsc_update(struct rsc *new, struct rsc *tmp)
{
new->mechctx = tmp->mechctx;
tmp->mechctx = NULL;
memset(&new->seqdata, 0, sizeof(new->seqdata));
spin_lock_init(&new->seqdata.sd_lock);
new->cred = tmp->cred;
tmp->cred.cr_group_info = NULL;
}
static int rsc_parse(struct cache_detail *cd,
char *mesg, int mlen)
{
/* contexthandle expiry [ uid gid N <n gids> mechname ...mechdata... ] */
char *buf = mesg;
int len, rv;
struct rsc rsci, *rscp = NULL;
time_t expiry;
int status = -EINVAL;
memset(&rsci, 0, sizeof(rsci));
/* context handle */
len = qword_get(&mesg, buf, mlen);
if (len < 0) goto out;
status = -ENOMEM;
if (dup_to_netobj(&rsci.handle, buf, len))
goto out;
rsci.h.flags = 0;
/* expiry */
expiry = get_expiry(&mesg);
status = -EINVAL;
if (expiry == 0)
goto out;
/* uid, or NEGATIVE */
rv = get_int(&mesg, &rsci.cred.cr_uid);
if (rv == -EINVAL)
goto out;
if (rv == -ENOENT)
set_bit(CACHE_NEGATIVE, &rsci.h.flags);
else {
int N, i;
struct gss_api_mech *gm;
struct xdr_netobj tmp_buf;
/* gid */
if (get_int(&mesg, &rsci.cred.cr_gid))
goto out;
/* number of additional gid's */
if (get_int(&mesg, &N))
goto out;
rsci.cred.cr_group_info = groups_alloc(N);
if (rsci.cred.cr_group_info == NULL)
goto out;
/* gid's */
for (i=0; i<N; i++) {
gid_t gid;
if (get_int(&mesg, &gid))
goto out;
GROUP_AT(rsci.cred.cr_group_info, i) = gid;
}
/* mech name */
len = qword_get(&mesg, buf, mlen);
if (len < 0)
goto out;
gm = gss_mech_get_by_name(buf);
/* mech-specific data: */
len = qword_get(&mesg, buf, mlen);
if (len < 0) {
gss_mech_put(gm);
goto out;
}
tmp_buf.len = len;
tmp_buf.data = buf;
if (gss_import_sec_context(&tmp_buf, gm, &rsci.mechctx)) {
gss_mech_put(gm);
goto out;
}
gss_mech_put(gm);
}
rsci.h.expiry_time = expiry;
rscp = rsc_lookup(&rsci, 1);
status = 0;
out:
rsc_free(&rsci);
if (rscp)
rsc_put(&rscp->h, &rsc_cache);
return status;
}
static struct cache_detail rsc_cache = {
.hash_size = RSC_HASHMAX,
.hash_table = rsc_table,
.name = "auth.rpcsec.context",
.cache_put = rsc_put,
.cache_parse = rsc_parse,
};
static DefineSimpleCacheLookup(rsc, 0);
struct rsc *
gss_svc_searchbyctx(struct xdr_netobj *handle)
{
struct rsc rsci;
struct rsc *found;
rsci.handle = *handle;
found = rsc_lookup(&rsci, 0);
if (!found)
return NULL;
if (cache_check(&rsc_cache, &found->h, NULL))
return NULL;
return found;
}
/* Implements sequence number algorithm as specified in RFC 2203. */
static int
gss_check_seq_num(struct rsc *rsci, int seq_num)
{
struct gss_svc_seq_data *sd = &rsci->seqdata;
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 <= sd->sd_max - GSS_SEQ_WIN) {
goto drop;
}
/* sd_max - GSS_SEQ_WIN < seq_num <= sd_max */
if (__test_and_set_bit(seq_num % GSS_SEQ_WIN, sd->sd_win))
goto drop;
ok:
spin_unlock(&sd->sd_lock);
return 1;
drop:
spin_unlock(&sd->sd_lock);
return 0;
}
static inline u32 round_up_to_quad(u32 i)
{
return (i + 3 ) & ~3;
}
static inline int
svc_safe_getnetobj(struct iovec *argv, struct xdr_netobj *o)
{
int l;
if (argv->iov_len < 4)
return -1;
o->len = ntohl(svc_getu32(argv));
l = round_up_to_quad(o->len);
if (argv->iov_len < l)
return -1;
o->data = argv->iov_base;
argv->iov_base += l;
argv->iov_len -= l;
return 0;
}
static inline int
svc_safe_putnetobj(struct iovec *resv, struct xdr_netobj *o)
{
u32 *p;
if (resv->iov_len + 4 > PAGE_SIZE)
return -1;
svc_putu32(resv, htonl(o->len));
p = resv->iov_base + resv->iov_len;
resv->iov_len += round_up_to_quad(o->len);
if (resv->iov_len > PAGE_SIZE)
return -1;
memcpy(p, o->data, o->len);
memset((u8 *)p + o->len, 0, round_up_to_quad(o->len) - o->len);
return 0;
}
/* Verify the checksum on the header and return SVC_OK on success.
* Otherwise, return SVC_DROP (in the case of a bad sequence number)
* or return SVC_DENIED and indicate error in authp.
*/
static int
gss_verify_header(struct svc_rqst *rqstp, struct rsc *rsci,
u32 *rpcstart, struct rpc_gss_wire_cred *gc, u32 *authp)
{
struct gss_ctx *ctx_id = rsci->mechctx;
struct xdr_buf rpchdr;
struct xdr_netobj checksum;
u32 flavor = 0;
struct iovec *argv = &rqstp->rq_arg.head[0];
struct iovec iov;
/* data to compute the checksum over: */
iov.iov_base = rpcstart;
iov.iov_len = (u8 *)argv->iov_base - (u8 *)rpcstart;
xdr_buf_from_iov(&iov, &rpchdr);
*authp = rpc_autherr_badverf;
if (argv->iov_len < 4)
return SVC_DENIED;
flavor = ntohl(svc_getu32(argv));
if (flavor != RPC_AUTH_GSS)
return SVC_DENIED;
if (svc_safe_getnetobj(argv, &checksum))
return SVC_DENIED;
if (rqstp->rq_deferred) /* skip verification of revisited request */
return SVC_OK;
if (gss_verify_mic(ctx_id, &rpchdr, &checksum, NULL)
!= GSS_S_COMPLETE) {
*authp = rpcsec_gsserr_credproblem;
return SVC_DENIED;
}
if (gc->gc_seq > MAXSEQ) {
dprintk("svcauth_gss: discarding request with large"
" sequence number %d\n", gc->gc_seq);
*authp = rpcsec_gsserr_ctxproblem;
return SVC_DENIED;
}
if (!gss_check_seq_num(rsci, gc->gc_seq)) {
dprintk("svcauth_gss: discarding request with old"
" sequence number %d\n", gc->gc_seq);
return SVC_DROP;
}
return SVC_OK;
}
static int
gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
{
u32 xdr_seq;
u32 maj_stat;
struct xdr_buf verf_data;
struct xdr_netobj mic;
u32 *p;
struct iovec iov;
svc_putu32(rqstp->rq_res.head, htonl(RPC_AUTH_GSS));
xdr_seq = htonl(seq);
iov.iov_base = &xdr_seq;
iov.iov_len = sizeof(xdr_seq);
xdr_buf_from_iov(&iov, &verf_data);
p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
mic.data = (u8 *)(p + 1);
maj_stat = gss_get_mic(ctx_id, 0, &verf_data, &mic);
if (maj_stat != GSS_S_COMPLETE)
return -1;
*p++ = htonl(mic.len);
memset((u8 *)p + mic.len, 0, round_up_to_quad(mic.len) - mic.len);
p += XDR_QUADLEN(mic.len);
if (!xdr_ressize_check(rqstp, p))
return -1;
return 0;
}
struct gss_domain {
struct auth_domain h;
u32 pseudoflavor;
};
/* XXX this should be done in gss_pseudoflavors, and shouldn't be hardcoded: */
static struct auth_domain *
find_gss_auth_domain(struct gss_ctx *ctx, u32 svc)
{
switch(gss_get_pseudoflavor(ctx, 0, svc)) {
case RPC_AUTH_GSS_KRB5:
return auth_domain_find("gss/krb5");
case RPC_AUTH_GSS_KRB5I:
return auth_domain_find("gss/krb5i");
case RPC_AUTH_GSS_KRB5P:
return auth_domain_find("gss/krb5p");
}
return NULL;
}
int
svcauth_gss_register_pseudoflavor(u32 pseudoflavor, char * name)
{
struct gss_domain *new;
struct auth_domain *test;
static char *prefix = "gss/";
int stat = -1;
new = kmalloc(sizeof(*new), GFP_KERNEL);
if (!new)
goto out;
cache_init(&new->h.h);
atomic_inc(&new->h.h.refcnt);
new->h.name = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
if (!new->h.name)
goto out_free_dom;
strcpy(new->h.name, prefix);
strcat(new->h.name, name);
new->h.flavour = RPC_AUTH_GSS;
new->pseudoflavor = pseudoflavor;
new->h.h.expiry_time = NEVER;
new->h.h.flags = 0;
test = auth_domain_lookup(&new->h, 1);
if (test == &new->h) {
BUG_ON(atomic_dec_and_test(&new->h.h.refcnt));
} else { /* XXX Duplicate registration? */
auth_domain_put(&new->h);
goto out;
}
return 0;
out_free_dom:
kfree(new);
out:
return stat;
}
/*
* Accept an rpcsec packet.
* If context establishment, punt to user space
* If data exchange, verify/decrypt
* If context destruction, handle here
* In the context establishment and destruction case we encode
* response here and return SVC_COMPLETE.
*/
static int
svcauth_gss_accept(struct svc_rqst *rqstp, u32 *authp)
{
struct iovec *argv = &rqstp->rq_arg.head[0];
struct iovec *resv = &rqstp->rq_res.head[0];
u32 crlen;
struct xdr_netobj tmpobj;
struct gss_svc_data *svcdata = rqstp->rq_auth_data;
struct rpc_gss_wire_cred *gc;
struct rsc *rsci = NULL;
struct rsi *rsip, rsikey;
u32 *rpcstart;
u32 *reject_stat = resv->iov_base;
int ret;
dprintk("RPC: svcauth_gss: argv->iov_len = %zd\n",argv->iov_len);
*authp = rpc_autherr_badcred;
if (!svcdata)
svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
if (!svcdata)
goto auth_err;
rqstp->rq_auth_data = svcdata;
gc = &svcdata->clcred;
/* start of rpc packet is 7 u32's back from here:
* xid direction rpcversion prog vers proc flavour
*/
rpcstart = argv->iov_base;
rpcstart -= 7;
/* credential is:
* version(==1), proc(0,1,2,3), seq, service (1,2,3), handle
* at least 5 u32s, and is preceeded by length, so that makes 6.
*/
if (argv->iov_len < 5 * 4)
goto auth_err;
crlen = ntohl(svc_getu32(argv));
if (ntohl(svc_getu32(argv)) != RPC_GSS_VERSION)
goto auth_err;
gc->gc_proc = ntohl(svc_getu32(argv));
gc->gc_seq = ntohl(svc_getu32(argv));
gc->gc_svc = ntohl(svc_getu32(argv));
if (svc_safe_getnetobj(argv, &gc->gc_ctx))
goto auth_err;
if (crlen != round_up_to_quad(gc->gc_ctx.len) + 5 * 4)
goto auth_err;
if ((gc->gc_proc != RPC_GSS_PROC_DATA) && (rqstp->rq_proc != 0))
goto auth_err;
/*
* We've successfully parsed the credential. Let's check out the
* verifier. An AUTH_NULL verifier is allowed (and required) for
* INIT and CONTINUE_INIT requests. AUTH_RPCSEC_GSS is required for
* PROC_DATA and PROC_DESTROY.
*
* AUTH_NULL verifier is 0 (AUTH_NULL), 0 (length).
* AUTH_RPCSEC_GSS verifier is:
* 6 (AUTH_RPCSEC_GSS), length, checksum.
* checksum is calculated over rpcheader from xid up to here.
*/
*authp = rpc_autherr_badverf;
switch (gc->gc_proc) {
case RPC_GSS_PROC_INIT:
case RPC_GSS_PROC_CONTINUE_INIT:
if (argv->iov_len < 2 * 4)
goto auth_err;
if (ntohl(svc_getu32(argv)) != RPC_AUTH_NULL)
goto auth_err;
if (ntohl(svc_getu32(argv)) != 0)
goto auth_err;
break;
case RPC_GSS_PROC_DATA:
case RPC_GSS_PROC_DESTROY:
/* integrity and privacy unsupported: */
if (gc->gc_svc != RPC_GSS_SVC_NONE)
goto auth_err;
*authp = rpcsec_gsserr_credproblem;
rsci = gss_svc_searchbyctx(&gc->gc_ctx);
if (!rsci)
goto auth_err;
switch (gss_verify_header(rqstp, rsci, rpcstart, gc, authp)) {
case SVC_OK:
break;
case SVC_DENIED:
goto auth_err;
case SVC_DROP:
goto drop;
}
break;
default:
*authp = rpc_autherr_rejectedcred;
goto auth_err;
}
/* now act upon the command: */
switch (gc->gc_proc) {
case RPC_GSS_PROC_INIT:
case RPC_GSS_PROC_CONTINUE_INIT:
*authp = rpc_autherr_badcred;
if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
goto auth_err;
memset(&rsikey, 0, sizeof(rsikey));
if (dup_netobj(&rsikey.in_handle, &gc->gc_ctx))
goto drop;
*authp = rpc_autherr_badverf;
if (svc_safe_getnetobj(argv, &tmpobj)) {
kfree(rsikey.in_handle.data);
goto auth_err;
}
if (dup_netobj(&rsikey.in_token, &tmpobj)) {
kfree(rsikey.in_handle.data);
goto drop;
}
rsip = rsi_lookup(&rsikey, 0);
rsi_free(&rsikey);
if (!rsip) {
goto drop;
}
switch(cache_check(&rsi_cache, &rsip->h, &rqstp->rq_chandle)) {
case -EAGAIN:
goto drop;
case -ENOENT:
goto drop;
case 0:
rsci = gss_svc_searchbyctx(&rsip->out_handle);
if (!rsci) {
goto drop;
}
if (gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN))
goto drop;
if (resv->iov_len + 4 > PAGE_SIZE)
goto drop;
svc_putu32(resv, rpc_success);
if (svc_safe_putnetobj(resv, &rsip->out_handle))
goto drop;
if (resv->iov_len + 3 * 4 > PAGE_SIZE)
goto drop;
svc_putu32(resv, htonl(rsip->major_status));
svc_putu32(resv, htonl(rsip->minor_status));
svc_putu32(resv, htonl(GSS_SEQ_WIN));
if (svc_safe_putnetobj(resv, &rsip->out_token))
goto drop;
rqstp->rq_client = NULL;
}
goto complete;
case RPC_GSS_PROC_DESTROY:
set_bit(CACHE_NEGATIVE, &rsci->h.flags);
if (resv->iov_len + 4 > PAGE_SIZE)
goto drop;
svc_putu32(resv, rpc_success);
goto complete;
case RPC_GSS_PROC_DATA:
rqstp->rq_client =
find_gss_auth_domain(rsci->mechctx, gc->gc_svc);
if (rqstp->rq_client == NULL)
goto auth_err;
*authp = rpcsec_gsserr_ctxproblem;
if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
goto auth_err;
/* For use when wrapping: */
svcdata->body_start = resv->iov_base + 1;
rqstp->rq_cred = rsci->cred;
get_group_info(rsci->cred.cr_group_info);
ret = SVC_OK;
goto out;
}
auth_err:
/* Restore write pointer to original value: */
xdr_ressize_check(rqstp, reject_stat);
ret = SVC_DENIED;
goto out;
complete:
ret = SVC_COMPLETE;
goto out;
drop:
ret = SVC_DROP;
out:
if (rsci)
rsc_put(&rsci->h, &rsc_cache);
return ret;
}
static int
svcauth_gss_release(struct svc_rqst *rqstp)
{
if (rqstp->rq_client)
auth_domain_put(rqstp->rq_client);
rqstp->rq_client = NULL;
if (rqstp->rq_cred.cr_group_info)
put_group_info(rqstp->rq_cred.cr_group_info);
rqstp->rq_cred.cr_group_info = NULL;
return 0;
}
static void
svcauth_gss_domain_release(struct auth_domain *dom)
{
struct gss_domain *gd = container_of(dom, struct gss_domain, h);
kfree(dom->name);
kfree(gd);
}
struct auth_ops svcauthops_gss = {
.name = "rpcsec_gss",
.flavour = RPC_AUTH_GSS,
.accept = svcauth_gss_accept,
.release = svcauth_gss_release,
.domain_release = svcauth_gss_domain_release,
};
int
gss_svc_init(void)
{
cache_register(&rsc_cache);
cache_register(&rsi_cache);
svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
return 0;
}
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