svcauth_gss.c 45.7 KB
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/*
 * 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
 *
 */

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#include <linux/slab.h>
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#include <linux/types.h>
#include <linux/module.h>
#include <linux/pagemap.h>
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#include <linux/user_namespace.h>
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#include <linux/sunrpc/auth_gss.h>
#include <linux/sunrpc/gss_err.h>
#include <linux/sunrpc/svcauth.h>
#include <linux/sunrpc/svcauth_gss.h>
#include <linux/sunrpc/cache.h>
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#include "gss_rpc_upcall.h"
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
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# 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)

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;
};

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static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old);
static struct rsi *rsi_lookup(struct cache_detail *cd, struct rsi *item);
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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);
}

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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);
	rsi_free(rsii);
	kfree(rsii);
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}

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);
}

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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);
	struct rsi *tmp = container_of(b, struct rsi, h);
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	return netobj_equal(&item->in_handle, &tmp->in_handle) &&
	       netobj_equal(&item->in_token, &tmp->in_token);
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}

static int dup_to_netobj(struct xdr_netobj *dst, char *src, int len)
{
	dst->len = len;
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	dst->data = (len ? kmemdup(src, len, GFP_KERNEL) : NULL);
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	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);
}

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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);
	struct rsi *item = container_of(citem, struct rsi, h);

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	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;
}

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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);
	struct rsi *item = container_of(citem, struct rsi, h);

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	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;
}

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static struct cache_head *rsi_alloc(void)
{
	struct rsi *rsii = kmalloc(sizeof(*rsii), GFP_KERNEL);
	if (rsii)
		return &rsii->h;
	else
		return NULL;
}

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static void rsi_request(struct cache_detail *cd,
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		       struct cache_head *h,
		       char **bpp, int *blen)
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{
	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,
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		    char *mesg, int mlen)
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{
	/* 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;

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	rsip = rsi_lookup(cd, &rsii);
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	if (!rsip)
		goto out;

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	rsii.h.flags = 0;
	/* expiry */
	expiry = get_expiry(&mesg);
	status = -EINVAL;
	if (expiry == 0)
		goto out;

	/* major/minor */
	len = qword_get(&mesg, buf, mlen);
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	if (len <= 0)
		goto out;
	rsii.major_status = simple_strtoul(buf, &ep, 10);
	if (*ep)
		goto out;
	len = qword_get(&mesg, buf, mlen);
	if (len <= 0)
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		goto out;
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	rsii.minor_status = simple_strtoul(buf, &ep, 10);
	if (*ep)
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		goto out;

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	/* 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;
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	/* 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;
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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;
out:
	rsi_free(&rsii);
	if (rsip)
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		cache_put(&rsip->h, cd);
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	else
		status = -ENOMEM;
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	return status;
}

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static struct cache_detail rsi_cache_template = {
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	.owner		= THIS_MODULE,
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	.hash_size	= RSI_HASHMAX,
	.name           = "auth.rpcsec.init",
	.cache_put      = rsi_put,
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	.cache_request  = rsi_request,
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	.cache_parse    = rsi_parse,
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	.match		= rsi_match,
	.init		= rsi_init,
	.update		= update_rsi,
	.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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{
	struct cache_head *ch;
	int hash = rsi_hash(item);

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	ch = sunrpc_cache_lookup(cd, &item->h, hash);
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	if (ch)
		return container_of(ch, struct rsi, h);
	else
		return NULL;
}

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static struct rsi *rsi_update(struct cache_detail *cd, struct rsi *new, struct rsi *old)
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{
	struct cache_head *ch;
	int hash = rsi_hash(new);

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	ch = sunrpc_cache_update(cd, &new->h,
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				 &old->h, hash);
	if (ch)
		return container_of(ch, struct rsi, h);
	else
		return NULL;
}

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/*
 * 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 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;
};

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static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old);
static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item);
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static void rsc_free(struct rsc *rsci)
{
	kfree(rsci->handle.data);
	if (rsci->mechctx)
		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_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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	rsc_free(rsci);
	kfree(rsci);
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}

static inline int
rsc_hash(struct rsc *rsci)
{
	return hash_mem(rsci->handle.data, rsci->handle.len, RSC_HASHBITS);
}

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static int
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);
	struct rsc *tmp = container_of(b, struct rsc, h);

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	return netobj_equal(&new->handle, &tmp->handle);
}

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static void
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);
	struct rsc *tmp = container_of(ctmp, struct rsc, h);

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	new->handle.len = tmp->handle.len;
	tmp->handle.len = 0;
	new->handle.data = tmp->handle.data;
	tmp->handle.data = NULL;
	new->mechctx = NULL;
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	init_svc_cred(&new->cred);
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}

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static void
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);
	struct rsc *tmp = container_of(ctmp, struct rsc, h);

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	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;
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	init_svc_cred(&tmp->cred);
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}

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static struct cache_head *
rsc_alloc(void)
{
	struct rsc *rsci = kmalloc(sizeof(*rsci), GFP_KERNEL);
	if (rsci)
		return &rsci->h;
	else
		return NULL;
}

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static int rsc_parse(struct cache_detail *cd,
		     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;
	struct rsc rsci, *rscp = NULL;
	time_t expiry;
	int status = -EINVAL;
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	struct gss_api_mech *gm = NULL;
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	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;

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	rscp = rsc_lookup(cd, &rsci);
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	if (!rscp)
		goto out;

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	/* uid, or NEGATIVE */
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	rv = get_int(&mesg, &id);
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	if (rv == -EINVAL)
		goto out;
	if (rv == -ENOENT)
		set_bit(CACHE_NEGATIVE, &rsci.h.flags);
	else {
		int N, i;

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		/*
		 * 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.)
		 */
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		/* uid */
		rsci.cred.cr_uid = make_kuid(&init_user_ns, id);

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		/* gid */
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		if (get_int(&mesg, &id))
			goto out;
		rsci.cred.cr_gid = make_kgid(&init_user_ns, id);
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		/* number of additional gid's */
		if (get_int(&mesg, &N))
			goto out;
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		if (N < 0 || N > NGROUPS_MAX)
			goto out;
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		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++) {
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			kgid_t kgid;
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			if (get_int(&mesg, &id))
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				goto out;
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			kgid = make_kgid(&init_user_ns, id);
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			if (!gid_valid(kgid))
				goto out;
			GROUP_AT(rsci.cred.cr_group_info, i) = kgid;
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		}

		/* mech name */
		len = qword_get(&mesg, buf, mlen);
		if (len < 0)
			goto out;
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		gm = rsci.cred.cr_gss_mech = gss_mech_get_by_name(buf);
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		status = -EOPNOTSUPP;
		if (!gm)
			goto out;

		status = -EINVAL;
		/* mech-specific data: */
		len = qword_get(&mesg, buf, mlen);
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		if (len < 0)
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			goto out;
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		status = gss_import_sec_context(buf, len, gm, &rsci.mechctx,
						NULL, GFP_KERNEL);
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		if (status)
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			goto out;
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		/* get client name */
		len = qword_get(&mesg, buf, mlen);
		if (len > 0) {
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			rsci.cred.cr_principal = kstrdup(buf, GFP_KERNEL);
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			if (!rsci.cred.cr_principal) {
				status = -ENOMEM;
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				goto out;
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			}
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		}

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	}
	rsci.h.expiry_time = expiry;
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	rscp = rsc_update(cd, &rsci, rscp);
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	status = 0;
out:
	rsc_free(&rsci);
	if (rscp)
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		cache_put(&rscp->h, cd);
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	else
		status = -ENOMEM;
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	return status;
}

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static struct cache_detail rsc_cache_template = {
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	.owner		= THIS_MODULE,
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	.hash_size	= RSC_HASHMAX,
	.name		= "auth.rpcsec.context",
	.cache_put	= rsc_put,
	.cache_parse	= rsc_parse,
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	.match		= rsc_match,
	.init		= rsc_init,
	.update		= update_rsc,
	.alloc		= rsc_alloc,
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};

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static struct rsc *rsc_lookup(struct cache_detail *cd, struct rsc *item)
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{
	struct cache_head *ch;
	int hash = rsc_hash(item);

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	ch = sunrpc_cache_lookup(cd, &item->h, hash);
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	if (ch)
		return container_of(ch, struct rsc, h);
	else
		return NULL;
}

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static struct rsc *rsc_update(struct cache_detail *cd, struct rsc *new, struct rsc *old)
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{
	struct cache_head *ch;
	int hash = rsc_hash(new);

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	ch = sunrpc_cache_update(cd, &new->h,
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				 &old->h, hash);
	if (ch)
		return container_of(ch, struct rsc, h);
	else
		return NULL;
}

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static struct rsc *
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gss_svc_searchbyctx(struct cache_detail *cd, struct xdr_netobj *handle)
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{
	struct rsc rsci;
	struct rsc *found;

	memset(&rsci, 0, sizeof(rsci));
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	rsci.handle.data = handle->data;
	rsci.handle.len = handle->len;
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	found = rsc_lookup(cd, &rsci);
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	if (!found)
		return NULL;
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	if (cache_check(cd, &found->h, NULL))
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		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 kvec *argv, struct xdr_netobj *o)
{
	int l;

	if (argv->iov_len < 4)
		return -1;
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Alexey Dobriyan 已提交
625
	o->len = svc_getnl(argv);
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	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 kvec *resv, struct xdr_netobj *o)
{
638
	u8 *p;
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Linus Torvalds 已提交
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	if (resv->iov_len + 4 > PAGE_SIZE)
		return -1;
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642
	svc_putnl(resv, o->len);
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	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);
648
	memset(p + o->len, 0, round_up_to_quad(o->len) - o->len);
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	return 0;
}

652 653
/*
 * Verify the checksum on the header and return SVC_OK on success.
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 * 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,
659
		  __be32 *rpcstart, struct rpc_gss_wire_cred *gc, __be32 *authp)
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{
	struct gss_ctx		*ctx_id = rsci->mechctx;
	struct xdr_buf		rpchdr;
	struct xdr_netobj	checksum;
	u32			flavor = 0;
	struct kvec		*argv = &rqstp->rq_arg.head[0];
	struct kvec		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;
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	flavor = svc_getnl(argv);
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	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;
684
	if (gss_verify_mic(ctx_id, &rpchdr, &checksum) != GSS_S_COMPLETE) {
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		*authp = rpcsec_gsserr_credproblem;
		return SVC_DENIED;
	}

	if (gc->gc_seq > MAXSEQ) {
690 691
		dprintk("RPC:       svcauth_gss: discarding request with "
				"large sequence number %d\n", gc->gc_seq);
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		*authp = rpcsec_gsserr_ctxproblem;
		return SVC_DENIED;
	}
	if (!gss_check_seq_num(rsci, gc->gc_seq)) {
696 697
		dprintk("RPC:       svcauth_gss: discarding request with "
				"old sequence number %d\n", gc->gc_seq);
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		return SVC_DROP;
	}
	return SVC_OK;
}

703 704 705
static int
gss_write_null_verf(struct svc_rqst *rqstp)
{
706
	__be32     *p;
707

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	svc_putnl(rqstp->rq_res.head, RPC_AUTH_NULL);
709 710 711 712 713 714 715 716
	p = rqstp->rq_res.head->iov_base + rqstp->rq_res.head->iov_len;
	/* don't really need to check if head->iov_len > PAGE_SIZE ... */
	*p++ = 0;
	if (!xdr_ressize_check(rqstp, p))
		return -1;
	return 0;
}

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static int
gss_write_verf(struct svc_rqst *rqstp, struct gss_ctx *ctx_id, u32 seq)
{
720
	__be32			xdr_seq;
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	u32			maj_stat;
	struct xdr_buf		verf_data;
	struct xdr_netobj	mic;
724
	__be32			*p;
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	struct kvec		iov;

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727
	svc_putnl(rqstp->rq_res.head, RPC_AUTH_GSS);
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	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);
735
	maj_stat = gss_get_mic(ctx_id, &verf_data, &mic);
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	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;
};

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);
}

762 763
static struct auth_ops svcauthops_gss;

764 765 766 767 768 769 770
u32 svcauth_gss_flavor(struct auth_domain *dom)
{
	struct gss_domain *gd = container_of(dom, struct gss_domain, h);

	return gd->pseudoflavor;
}

771
EXPORT_SYMBOL_GPL(svcauth_gss_flavor);
772

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int
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;
783
	kref_init(&new->h.ref);
784
	new->h.name = kstrdup(name, GFP_KERNEL);
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	if (!new->h.name)
		goto out_free_dom;
787
	new->h.flavour = &svcauthops_gss;
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	new->pseudoflavor = pseudoflavor;

790
	stat = 0;
791
	test = auth_domain_lookup(name, &new->h);
792 793 794 795
	if (test != &new->h) { /* Duplicate registration */
		auth_domain_put(test);
		kfree(new->h.name);
		goto out_free_dom;
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	}
	return 0;

out_free_dom:
	kfree(new);
out:
	return stat;
}

805
EXPORT_SYMBOL_GPL(svcauth_gss_register_pseudoflavor);
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static inline int
read_u32_from_xdr_buf(struct xdr_buf *buf, int base, u32 *obj)
{
810
	__be32  raw;
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	int     status;

	status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
	if (status)
		return status;
	*obj = ntohl(raw);
	return 0;
}

/* It would be nice if this bit of code could be shared with the client.
 * Obstacles:
 *	The client shouldn't malloc(), would have to pass in own memory.
 *	The server uses base of head iovec as read pointer, while the
 *	client uses separate pointer. */
static int
826
unwrap_integ_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
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{
	int stat = -EINVAL;
	u32 integ_len, maj_stat;
	struct xdr_netobj mic;
	struct xdr_buf integ_buf;

833 834 835 836
	/* Did we already verify the signature on the original pass through? */
	if (rqstp->rq_deferred)
		return 0;

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	integ_len = svc_getnl(&buf->head[0]);
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	if (integ_len & 3)
839
		return stat;
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	if (integ_len > buf->len)
841
		return stat;
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	if (xdr_buf_subsegment(buf, &integ_buf, 0, integ_len))
		BUG();
	/* copy out mic... */
	if (read_u32_from_xdr_buf(buf, integ_len, &mic.len))
		BUG();
	if (mic.len > RPC_MAX_AUTH_SIZE)
848
		return stat;
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	mic.data = kmalloc(mic.len, GFP_KERNEL);
	if (!mic.data)
851
		return stat;
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	if (read_bytes_from_xdr_buf(buf, integ_len + 4, mic.data, mic.len))
		goto out;
854
	maj_stat = gss_verify_mic(ctx, &integ_buf, &mic);
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	if (maj_stat != GSS_S_COMPLETE)
		goto out;
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	if (svc_getnl(&buf->head[0]) != seq)
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Linus Torvalds 已提交
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		goto out;
859 860
	/* trim off the mic and padding at the end before returning */
	xdr_buf_trim(buf, round_up_to_quad(mic.len) + 4);
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	stat = 0;
out:
863
	kfree(mic.data);
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	return stat;
}

867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889
static inline int
total_buf_len(struct xdr_buf *buf)
{
	return buf->head[0].iov_len + buf->page_len + buf->tail[0].iov_len;
}

static void
fix_priv_head(struct xdr_buf *buf, int pad)
{
	if (buf->page_len == 0) {
		/* We need to adjust head and buf->len in tandem in this
		 * case to make svc_defer() work--it finds the original
		 * buffer start using buf->len - buf->head[0].iov_len. */
		buf->head[0].iov_len -= pad;
	}
}

static int
unwrap_priv_data(struct svc_rqst *rqstp, struct xdr_buf *buf, u32 seq, struct gss_ctx *ctx)
{
	u32 priv_len, maj_stat;
	int pad, saved_len, remaining_len, offset;

890
	clear_bit(RQ_SPLICE_OK, &rqstp->rq_flags);
891

A
Alexey Dobriyan 已提交
892
	priv_len = svc_getnl(&buf->head[0]);
893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929
	if (rqstp->rq_deferred) {
		/* Already decrypted last time through! The sequence number
		 * check at out_seq is unnecessary but harmless: */
		goto out_seq;
	}
	/* buf->len is the number of bytes from the original start of the
	 * request to the end, where head[0].iov_len is just the bytes
	 * not yet read from the head, so these two values are different: */
	remaining_len = total_buf_len(buf);
	if (priv_len > remaining_len)
		return -EINVAL;
	pad = remaining_len - priv_len;
	buf->len -= pad;
	fix_priv_head(buf, pad);

	/* Maybe it would be better to give gss_unwrap a length parameter: */
	saved_len = buf->len;
	buf->len = priv_len;
	maj_stat = gss_unwrap(ctx, 0, buf);
	pad = priv_len - buf->len;
	buf->len = saved_len;
	buf->len -= pad;
	/* The upper layers assume the buffer is aligned on 4-byte boundaries.
	 * In the krb5p case, at least, the data ends up offset, so we need to
	 * move it around. */
	/* XXX: This is very inefficient.  It would be better to either do
	 * this while we encrypt, or maybe in the receive code, if we can peak
	 * ahead and work out the service and mechanism there. */
	offset = buf->head[0].iov_len % 4;
	if (offset) {
		buf->buflen = RPCSVC_MAXPAYLOAD;
		xdr_shift_buf(buf, offset);
		fix_priv_head(buf, pad);
	}
	if (maj_stat != GSS_S_COMPLETE)
		return -EINVAL;
out_seq:
A
Alexey Dobriyan 已提交
930
	if (svc_getnl(&buf->head[0]) != seq)
931 932 933 934
		return -EINVAL;
	return 0;
}

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935 936 937
struct gss_svc_data {
	/* decoded gss client cred: */
	struct rpc_gss_wire_cred	clcred;
938 939 940
	/* save a pointer to the beginning of the encoded verifier,
	 * for use in encryption/checksumming in svcauth_gss_release: */
	__be32				*verf_start;
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941 942 943 944 945 946 947 948 949
	struct rsc			*rsci;
};

static int
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;
950
	int stat;
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Linus Torvalds 已提交
951

952 953 954 955 956 957 958 959 960 961 962
	/*
	 * 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)
L
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963
		return SVC_DENIED;
964
	stat = svcauth_unix_set_client(rqstp);
965
	if (stat == SVC_DROP || stat == SVC_CLOSE)
966
		return stat;
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967 968 969
	return SVC_OK;
}

970
static inline int
971 972
gss_write_init_verf(struct cache_detail *cd, struct svc_rqst *rqstp,
		struct xdr_netobj *out_handle, int *major_status)
973 974
{
	struct rsc *rsci;
975
	int        rc;
976

977
	if (*major_status != GSS_S_COMPLETE)
978
		return gss_write_null_verf(rqstp);
979
	rsci = gss_svc_searchbyctx(cd, out_handle);
980
	if (rsci == NULL) {
981
		*major_status = GSS_S_NO_CONTEXT;
982 983
		return gss_write_null_verf(rqstp);
	}
984
	rc = gss_write_verf(rqstp, rsci->mechctx, GSS_SEQ_WIN);
985
	cache_put(&rsci->h, cd);
986
	return rc;
987 988
}

989
static inline int
990 991 992
gss_read_common_verf(struct rpc_gss_wire_cred *gc,
		     struct kvec *argv, __be32 *authp,
		     struct xdr_netobj *in_handle)
993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005
{
	/* Read the verifier; should be NULL: */
	*authp = rpc_autherr_badverf;
	if (argv->iov_len < 2 * 4)
		return SVC_DENIED;
	if (svc_getnl(argv) != RPC_AUTH_NULL)
		return SVC_DENIED;
	if (svc_getnl(argv) != 0)
		return SVC_DENIED;
	/* Martial context handle and token for upcall: */
	*authp = rpc_autherr_badcred;
	if (gc->gc_proc == RPC_GSS_PROC_INIT && gc->gc_ctx.len != 0)
		return SVC_DENIED;
1006
	if (dup_netobj(in_handle, &gc->gc_ctx))
1007
		return SVC_CLOSE;
1008
	*authp = rpc_autherr_badverf;
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025

	return 0;
}

static inline int
gss_read_verf(struct rpc_gss_wire_cred *gc,
	      struct kvec *argv, __be32 *authp,
	      struct xdr_netobj *in_handle,
	      struct xdr_netobj *in_token)
{
	struct xdr_netobj tmpobj;
	int res;

	res = gss_read_common_verf(gc, argv, authp, in_handle);
	if (res)
		return res;

1026
	if (svc_safe_getnetobj(argv, &tmpobj)) {
1027
		kfree(in_handle->data);
1028 1029
		return SVC_DENIED;
	}
1030 1031
	if (dup_netobj(in_token, &tmpobj)) {
		kfree(in_handle->data);
1032
		return SVC_CLOSE;
1033 1034
	}

1035 1036 1037
	return 0;
}

1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071
/* Ok this is really heavily depending on a set of semantics in
 * how rqstp is set up by svc_recv and pages laid down by the
 * server when reading a request. We are basically guaranteed that
 * the token lays all down linearly across a set of pages, starting
 * at iov_base in rq_arg.head[0] which happens to be the first of a
 * set of pages stored in rq_pages[].
 * rq_arg.head[0].iov_base will provide us the page_base to pass
 * to the upcall.
 */
static inline int
gss_read_proxy_verf(struct svc_rqst *rqstp,
		    struct rpc_gss_wire_cred *gc, __be32 *authp,
		    struct xdr_netobj *in_handle,
		    struct gssp_in_token *in_token)
{
	struct kvec *argv = &rqstp->rq_arg.head[0];
	u32 inlen;
	int res;

	res = gss_read_common_verf(gc, argv, authp, in_handle);
	if (res)
		return res;

	inlen = svc_getnl(argv);
	if (inlen > (argv->iov_len + rqstp->rq_arg.page_len))
		return SVC_DENIED;

	in_token->pages = rqstp->rq_pages;
	in_token->page_base = (ulong)argv->iov_base & ~PAGE_MASK;
	in_token->page_len = inlen;

	return 0;
}

1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098
static inline int
gss_write_resv(struct kvec *resv, size_t size_limit,
	       struct xdr_netobj *out_handle, struct xdr_netobj *out_token,
	       int major_status, int minor_status)
{
	if (resv->iov_len + 4 > size_limit)
		return -1;
	svc_putnl(resv, RPC_SUCCESS);
	if (svc_safe_putnetobj(resv, out_handle))
		return -1;
	if (resv->iov_len + 3 * 4 > size_limit)
		return -1;
	svc_putnl(resv, major_status);
	svc_putnl(resv, minor_status);
	svc_putnl(resv, GSS_SEQ_WIN);
	if (svc_safe_putnetobj(resv, out_token))
		return -1;
	return 0;
}

/*
 * 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.
 */
1099
static int svcauth_gss_legacy_init(struct svc_rqst *rqstp,
1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113
			struct rpc_gss_wire_cred *gc, __be32 *authp)
{
	struct kvec *argv = &rqstp->rq_arg.head[0];
	struct kvec *resv = &rqstp->rq_res.head[0];
	struct rsi *rsip, rsikey;
	int ret;
	struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id);

	memset(&rsikey, 0, sizeof(rsikey));
	ret = gss_read_verf(gc, argv, authp,
			    &rsikey.in_handle, &rsikey.in_token);
	if (ret)
		return ret;

1114
	/* Perform upcall, or find upcall result: */
1115
	rsip = rsi_lookup(sn->rsi_cache, &rsikey);
1116 1117
	rsi_free(&rsikey);
	if (!rsip)
1118
		return SVC_CLOSE;
1119
	if (cache_check(sn->rsi_cache, &rsip->h, &rqstp->rq_chandle) < 0)
1120
		/* No upcall result: */
1121
		return SVC_CLOSE;
1122 1123 1124

	ret = SVC_CLOSE;
	/* Got an answer to the upcall; use it: */
1125 1126
	if (gss_write_init_verf(sn->rsc_cache, rqstp,
				&rsip->out_handle, &rsip->major_status))
1127
		goto out;
1128 1129 1130
	if (gss_write_resv(resv, PAGE_SIZE,
			   &rsip->out_handle, &rsip->out_token,
			   rsip->major_status, rsip->minor_status))
1131 1132
		goto out;

1133 1134
	ret = SVC_COMPLETE;
out:
1135
	cache_put(&rsip->h, sn->rsi_cache);
1136
	return ret;
1137 1138
}

1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170
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;
	time_t expiry;
	int status = -EINVAL;

	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 */
1171 1172
		dprintk("RPC:       No creds found!\n");
		goto out;
1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183
	} else {

		/* 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;
1184
		rsci.cred.cr_gss_mech = gm;
1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232

		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;
	}

	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, __be32 *authp)
{
	struct kvec *resv = &rqstp->rq_res.head[0];
	struct xdr_netobj cli_handle;
	struct gssp_upcall_data ud;
	uint64_t handle;
	int status;
	int ret;
	struct net *net = rqstp->rq_xprt->xpt_net;
	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);

	memset(&ud, 0, sizeof(ud));
	ret = gss_read_proxy_verf(rqstp, gc, authp,
				  &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;

1233 1234 1235
	dprintk("RPC:       svcauth_gss: gss major status = %d "
			"minor status = %d\n",
			ud.major_status, ud.minor_status);
1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267

	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:
		ret = SVC_CLOSE;
		goto out;
	}

	/* Got an answer to the upcall; use it: */
	if (gss_write_init_verf(sn->rsc_cache, rqstp,
				&cli_handle, &ud.major_status))
		goto out;
	if (gss_write_resv(resv, PAGE_SIZE,
			   &cli_handle, &ud.out_token,
			   ud.major_status, ud.minor_status))
		goto out;

	ret = SVC_COMPLETE;
out:
	gssp_free_upcall_data(&ud);
	return ret;
}

J
Jeff Layton 已提交
1268 1269 1270 1271 1272 1273
/*
 * 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)
1274 1275
{
	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
J
Jeff Layton 已提交
1276
	int ret;
1277

J
Jeff Layton 已提交
1278 1279 1280 1281
	WARN_ON_ONCE(type != 0 && type != 1);
	ret = cmpxchg(&sn->use_gss_proxy, -1, type);
	if (ret != -1 && ret != type)
		return -EBUSY;
1282 1283 1284
	return 0;
}

J
Jeff Layton 已提交
1285
static bool use_gss_proxy(struct net *net)
1286 1287 1288
{
	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);

J
Jeff Layton 已提交
1289 1290 1291 1292
	/* 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;
1293 1294
}

J
Jeff Layton 已提交
1295 1296
#ifdef CONFIG_PROC_FS

1297 1298 1299
static ssize_t write_gssp(struct file *file, const char __user *buf,
			 size_t count, loff_t *ppos)
{
A
Al Viro 已提交
1300
	struct net *net = PDE_DATA(file_inode(file));
1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315
	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;
1316
	res = set_gssp_clnt(net);
1317 1318
	if (res)
		return res;
1319
	res = set_gss_proxy(net, 1);
1320 1321 1322 1323 1324 1325 1326 1327
	if (res)
		return res;
	return count;
}

static ssize_t read_gssp(struct file *file, char __user *buf,
			 size_t count, loff_t *ppos)
{
A
Al Viro 已提交
1328
	struct net *net = PDE_DATA(file_inode(file));
1329
	struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
1330 1331 1332 1333
	unsigned long p = *ppos;
	char tbuf[10];
	size_t len;

1334
	snprintf(tbuf, sizeof(tbuf), "%d\n", sn->use_gss_proxy);
1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376
	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 file_operations use_gss_proxy_ops = {
	.open = nonseekable_open,
	.write = write_gssp,
	.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|S_IRUSR|S_IWUSR,
			      sn->proc_net_rpc,
			      &use_gss_proxy_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);
	}
}
1377 1378 1379 1380 1381 1382 1383 1384
#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) {}
1385 1386 1387

#endif /* CONFIG_PROC_FS */

L
Linus Torvalds 已提交
1388 1389 1390 1391 1392 1393 1394 1395 1396
/*
 * 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
1397
svcauth_gss_accept(struct svc_rqst *rqstp, __be32 *authp)
L
Linus Torvalds 已提交
1398 1399 1400 1401 1402 1403 1404
{
	struct kvec	*argv = &rqstp->rq_arg.head[0];
	struct kvec	*resv = &rqstp->rq_res.head[0];
	u32		crlen;
	struct gss_svc_data *svcdata = rqstp->rq_auth_data;
	struct rpc_gss_wire_cred *gc;
	struct rsc	*rsci = NULL;
1405 1406
	__be32		*rpcstart;
	__be32		*reject_stat = resv->iov_base + resv->iov_len;
L
Linus Torvalds 已提交
1407
	int		ret;
1408
	struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id);
L
Linus Torvalds 已提交
1409

1410 1411
	dprintk("RPC:       svcauth_gss: argv->iov_len = %zd\n",
			argv->iov_len);
L
Linus Torvalds 已提交
1412 1413 1414 1415 1416 1417 1418

	*authp = rpc_autherr_badcred;
	if (!svcdata)
		svcdata = kmalloc(sizeof(*svcdata), GFP_KERNEL);
	if (!svcdata)
		goto auth_err;
	rqstp->rq_auth_data = svcdata;
1419
	svcdata->verf_start = NULL;
L
Linus Torvalds 已提交
1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430
	svcdata->rsci = NULL;
	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
L
Lucas De Marchi 已提交
1431
	 * at least 5 u32s, and is preceded by length, so that makes 6.
L
Linus Torvalds 已提交
1432 1433 1434 1435
	 */

	if (argv->iov_len < 5 * 4)
		goto auth_err;
A
Alexey Dobriyan 已提交
1436 1437
	crlen = svc_getnl(argv);
	if (svc_getnl(argv) != RPC_GSS_VERSION)
L
Linus Torvalds 已提交
1438
		goto auth_err;
A
Alexey Dobriyan 已提交
1439 1440 1441
	gc->gc_proc = svc_getnl(argv);
	gc->gc_seq = svc_getnl(argv);
	gc->gc_svc = svc_getnl(argv);
L
Linus Torvalds 已提交
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453
	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;

	*authp = rpc_autherr_badverf;
	switch (gc->gc_proc) {
	case RPC_GSS_PROC_INIT:
	case RPC_GSS_PROC_CONTINUE_INIT:
1454 1455 1456 1457
		if (use_gss_proxy(SVC_NET(rqstp)))
			return svcauth_gss_proxy_init(rqstp, gc, authp);
		else
			return svcauth_gss_legacy_init(rqstp, gc, authp);
L
Linus Torvalds 已提交
1458 1459
	case RPC_GSS_PROC_DATA:
	case RPC_GSS_PROC_DESTROY:
1460
		/* Look up the context, and check the verifier: */
L
Linus Torvalds 已提交
1461
		*authp = rpcsec_gsserr_credproblem;
1462
		rsci = gss_svc_searchbyctx(sn->rsc_cache, &gc->gc_ctx);
L
Linus Torvalds 已提交
1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481
		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_DESTROY:
1482 1483
		if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
			goto auth_err;
1484
		rsci->h.expiry_time = get_seconds();
L
Linus Torvalds 已提交
1485 1486 1487
		set_bit(CACHE_NEGATIVE, &rsci->h.flags);
		if (resv->iov_len + 4 > PAGE_SIZE)
			goto drop;
A
Alexey Dobriyan 已提交
1488
		svc_putnl(resv, RPC_SUCCESS);
L
Linus Torvalds 已提交
1489 1490 1491
		goto complete;
	case RPC_GSS_PROC_DATA:
		*authp = rpcsec_gsserr_ctxproblem;
1492
		svcdata->verf_start = resv->iov_base + resv->iov_len;
L
Linus Torvalds 已提交
1493 1494 1495 1496 1497 1498 1499 1500 1501
		if (gss_write_verf(rqstp, rsci->mechctx, gc->gc_seq))
			goto auth_err;
		rqstp->rq_cred = rsci->cred;
		get_group_info(rsci->cred.cr_group_info);
		*authp = rpc_autherr_badcred;
		switch (gc->gc_svc) {
		case RPC_GSS_SVC_NONE:
			break;
		case RPC_GSS_SVC_INTEGRITY:
1502 1503 1504
			/* placeholders for length and seq. number: */
			svc_putnl(resv, 0);
			svc_putnl(resv, 0);
1505
			if (unwrap_integ_data(rqstp, &rqstp->rq_arg,
L
Linus Torvalds 已提交
1506
					gc->gc_seq, rsci->mechctx))
1507
				goto garbage_args;
1508
			rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE;
1509 1510
			break;
		case RPC_GSS_SVC_PRIVACY:
L
Linus Torvalds 已提交
1511
			/* placeholders for length and seq. number: */
A
Alexey Dobriyan 已提交
1512 1513
			svc_putnl(resv, 0);
			svc_putnl(resv, 0);
1514 1515
			if (unwrap_priv_data(rqstp, &rqstp->rq_arg,
					gc->gc_seq, rsci->mechctx))
1516
				goto garbage_args;
1517
			rqstp->rq_auth_slack = RPC_MAX_AUTH_SIZE * 2;
1518
			break;
L
Linus Torvalds 已提交
1519 1520 1521 1522 1523
		default:
			goto auth_err;
		}
		svcdata->rsci = rsci;
		cache_get(&rsci->h);
1524
		rqstp->rq_cred.cr_flavor = gss_svc_to_pseudoflavor(
1525 1526 1527
					rsci->mechctx->mech_type,
					GSS_C_QOP_DEFAULT,
					gc->gc_svc);
L
Linus Torvalds 已提交
1528 1529 1530
		ret = SVC_OK;
		goto out;
	}
1531 1532 1533
garbage_args:
	ret = SVC_GARBAGE;
	goto out;
L
Linus Torvalds 已提交
1534
auth_err:
1535
	/* Restore write pointer to its original value: */
L
Linus Torvalds 已提交
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545
	xdr_ressize_check(rqstp, reject_stat);
	ret = SVC_DENIED;
	goto out;
complete:
	ret = SVC_COMPLETE;
	goto out;
drop:
	ret = SVC_DROP;
out:
	if (rsci)
1546
		cache_put(&rsci->h, sn->rsc_cache);
L
Linus Torvalds 已提交
1547 1548 1549
	return ret;
}

1550
static __be32 *
1551 1552
svcauth_gss_prepare_to_wrap(struct xdr_buf *resbuf, struct gss_svc_data *gsd)
{
1553 1554
	__be32 *p;
	u32 verf_len;
1555

1556 1557 1558 1559 1560 1561 1562 1563 1564 1565
	p = gsd->verf_start;
	gsd->verf_start = NULL;

	/* If the reply stat is nonzero, don't wrap: */
	if (*(p-1) != rpc_success)
		return NULL;
	/* Skip the verifier: */
	p += 1;
	verf_len = ntohl(*p++);
	p += XDR_QUADLEN(verf_len);
1566 1567
	/* move accept_stat to right place: */
	memcpy(p, p + 2, 4);
1568
	/* Also don't wrap if the accept stat is nonzero: */
1569 1570 1571 1572 1573 1574 1575 1576
	if (*p != rpc_success) {
		resbuf->head[0].iov_len -= 2 * 4;
		return NULL;
	}
	p++;
	return p;
}

1577 1578
static inline int
svcauth_gss_wrap_resp_integ(struct svc_rqst *rqstp)
L
Linus Torvalds 已提交
1579 1580 1581 1582 1583 1584 1585
{
	struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
	struct rpc_gss_wire_cred *gc = &gsd->clcred;
	struct xdr_buf *resbuf = &rqstp->rq_res;
	struct xdr_buf integ_buf;
	struct xdr_netobj mic;
	struct kvec *resv;
1586
	__be32 *p;
L
Linus Torvalds 已提交
1587 1588 1589
	int integ_offset, integ_len;
	int stat = -EINVAL;

1590 1591
	p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
	if (p == NULL)
1592 1593 1594 1595 1596 1597
		goto out;
	integ_offset = (u8 *)(p + 1) - (u8 *)resbuf->head[0].iov_base;
	integ_len = resbuf->len - integ_offset;
	BUG_ON(integ_len % 4);
	*p++ = htonl(integ_len);
	*p++ = htonl(gc->gc_seq);
J
J. Bruce Fields 已提交
1598
	if (xdr_buf_subsegment(resbuf, &integ_buf, integ_offset, integ_len))
1599
		BUG();
1600
	if (resbuf->tail[0].iov_base == NULL) {
1601 1602 1603 1604 1605 1606
		if (resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE > PAGE_SIZE)
			goto out_err;
		resbuf->tail[0].iov_base = resbuf->head[0].iov_base
						+ resbuf->head[0].iov_len;
		resbuf->tail[0].iov_len = 0;
	}
J
J. Bruce Fields 已提交
1607
	resv = &resbuf->tail[0];
1608 1609 1610
	mic.data = (u8 *)resv->iov_base + resv->iov_len + 4;
	if (gss_get_mic(gsd->rsci->mechctx, &integ_buf, &mic))
		goto out_err;
A
Alexey Dobriyan 已提交
1611
	svc_putnl(resv, mic.len);
1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623
	memset(mic.data + mic.len, 0,
			round_up_to_quad(mic.len) - mic.len);
	resv->iov_len += XDR_QUADLEN(mic.len) << 2;
	/* not strictly required: */
	resbuf->len += XDR_QUADLEN(mic.len) << 2;
	BUG_ON(resv->iov_len > PAGE_SIZE);
out:
	stat = 0;
out_err:
	return stat;
}

1624 1625 1626 1627 1628 1629 1630
static inline int
svcauth_gss_wrap_resp_priv(struct svc_rqst *rqstp)
{
	struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
	struct rpc_gss_wire_cred *gc = &gsd->clcred;
	struct xdr_buf *resbuf = &rqstp->rq_res;
	struct page **inpages = NULL;
1631 1632
	__be32 *p, *len;
	int offset;
1633 1634
	int pad;

1635 1636
	p = svcauth_gss_prepare_to_wrap(resbuf, gsd);
	if (p == NULL)
1637 1638 1639 1640 1641 1642 1643
		return 0;
	len = p++;
	offset = (u8 *)p - (u8 *)resbuf->head[0].iov_base;
	*p++ = htonl(gc->gc_seq);
	inpages = resbuf->pages;
	/* XXX: Would be better to write some xdr helper functions for
	 * nfs{2,3,4}xdr.c that place the data right, instead of copying: */
1644 1645 1646 1647 1648 1649 1650 1651

	/*
	 * 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.
	 */
1652
	if (resbuf->tail[0].iov_base) {
1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663
		BUG_ON(resbuf->tail[0].iov_base >= resbuf->head[0].iov_base
							+ PAGE_SIZE);
		BUG_ON(resbuf->tail[0].iov_base < resbuf->head[0].iov_base);
		if (resbuf->tail[0].iov_len + resbuf->head[0].iov_len
				+ 2 * RPC_MAX_AUTH_SIZE > PAGE_SIZE)
			return -ENOMEM;
		memmove(resbuf->tail[0].iov_base + RPC_MAX_AUTH_SIZE,
			resbuf->tail[0].iov_base,
			resbuf->tail[0].iov_len);
		resbuf->tail[0].iov_base += RPC_MAX_AUTH_SIZE;
	}
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	/*
	 * 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.
	 */
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	if (resbuf->tail[0].iov_base == NULL) {
		if (resbuf->head[0].iov_len + 2*RPC_MAX_AUTH_SIZE > PAGE_SIZE)
			return -ENOMEM;
		resbuf->tail[0].iov_base = resbuf->head[0].iov_base
			+ resbuf->head[0].iov_len + RPC_MAX_AUTH_SIZE;
		resbuf->tail[0].iov_len = 0;
	}
	if (gss_wrap(gsd->rsci->mechctx, offset, resbuf, inpages))
		return -ENOMEM;
	*len = htonl(resbuf->len - offset);
	pad = 3 - ((resbuf->len - offset - 1)&3);
1682
	p = (__be32 *)(resbuf->tail[0].iov_base + resbuf->tail[0].iov_len);
1683 1684 1685 1686 1687 1688
	memset(p, 0, pad);
	resbuf->tail[0].iov_len += pad;
	resbuf->len += pad;
	return 0;
}

1689 1690 1691 1692 1693 1694 1695
static int
svcauth_gss_release(struct svc_rqst *rqstp)
{
	struct gss_svc_data *gsd = (struct gss_svc_data *)rqstp->rq_auth_data;
	struct rpc_gss_wire_cred *gc = &gsd->clcred;
	struct xdr_buf *resbuf = &rqstp->rq_res;
	int stat = -EINVAL;
1696
	struct sunrpc_net *sn = net_generic(rqstp->rq_xprt->xpt_net, sunrpc_net_id);
1697

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	if (gc->gc_proc != RPC_GSS_PROC_DATA)
		goto out;
	/* Release can be called twice, but we only wrap once. */
1701
	if (gsd->verf_start == NULL)
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		goto out;
	/* normally not set till svc_send, but we need it here: */
1704 1705 1706
	/* XXX: what for?  Do we mess it up the moment we call svc_putu32
	 * or whatever? */
	resbuf->len = total_buf_len(resbuf);
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	switch (gc->gc_svc) {
	case RPC_GSS_SVC_NONE:
		break;
	case RPC_GSS_SVC_INTEGRITY:
1711 1712 1713
		stat = svcauth_gss_wrap_resp_integ(rqstp);
		if (stat)
			goto out_err;
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		break;
	case RPC_GSS_SVC_PRIVACY:
1716 1717 1718 1719
		stat = svcauth_gss_wrap_resp_priv(rqstp);
		if (stat)
			goto out_err;
		break;
1720 1721 1722 1723
	/*
	 * For any other gc_svc value, svcauth_gss_accept() already set
	 * the auth_error appropriately; just fall through:
	 */
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	}

out:
	stat = 0;
out_err:
	if (rqstp->rq_client)
		auth_domain_put(rqstp->rq_client);
	rqstp->rq_client = NULL;
1732 1733 1734
	if (rqstp->rq_gssclient)
		auth_domain_put(rqstp->rq_gssclient);
	rqstp->rq_gssclient = NULL;
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	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->rsci)
1739
		cache_put(&gsd->rsci->h, sn->rsc_cache);
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	gsd->rsci = NULL;

	return stat;
}

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);
}

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,
};

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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);
}

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int
1823
gss_svc_init_net(struct net *net)
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1824
{
1825 1826 1827
	int rv;

	rv = rsc_cache_create_net(net);
1828 1829
	if (rv)
		return rv;
1830
	rv = rsi_cache_create_net(net);
1831 1832
	if (rv)
		goto out1;
1833 1834 1835
	rv = create_use_gss_proxy_proc_entry(net);
	if (rv)
		goto out2;
1836
	return 0;
1837 1838
out2:
	destroy_use_gss_proxy_proc_entry(net);
1839
out1:
1840
	rsc_cache_destroy_net(net);
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	return rv;
}

1844 1845 1846
void
gss_svc_shutdown_net(struct net *net)
{
1847
	destroy_use_gss_proxy_proc_entry(net);
1848 1849 1850 1851 1852 1853 1854 1855 1856 1857
	rsi_cache_destroy_net(net);
	rsc_cache_destroy_net(net);
}

int
gss_svc_init(void)
{
	return svc_auth_register(RPC_AUTH_GSS, &svcauthops_gss);
}

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void
gss_svc_shutdown(void)
{
	svc_auth_unregister(RPC_AUTH_GSS);
}