148 lines
4.5 KiB
C
148 lines
4.5 KiB
C
/*
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* svc_auth_unix.c
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* Handles UNIX flavor authentication parameters on the service side of rpc.
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* There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
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* _svcauth_unix does full blown unix style uid,gid+gids auth,
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* _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
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* Note: the shorthand has been gutted for efficiency.
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*
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* Copyright (c) 2010, Oracle America, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the "Oracle America, Inc." nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <rpc/rpc.h>
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#include <rpc/svc.h>
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/*
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* Unix longhand authenticator
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*/
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enum auth_stat
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_svcauth_unix (struct svc_req *rqst, struct rpc_msg *msg)
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{
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enum auth_stat stat;
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XDR xdrs;
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struct authunix_parms *aup;
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int32_t *buf;
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struct area
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{
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struct authunix_parms area_aup;
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char area_machname[MAX_MACHINE_NAME + 1];
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gid_t area_gids[NGRPS];
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}
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*area;
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u_int auth_len;
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u_int str_len, gid_len;
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u_int i;
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area = (struct area *) rqst->rq_clntcred;
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aup = &area->area_aup;
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aup->aup_machname = area->area_machname;
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aup->aup_gids = area->area_gids;
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auth_len = (u_int) msg->rm_call.cb_cred.oa_length;
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xdrmem_create (&xdrs, msg->rm_call.cb_cred.oa_base, auth_len, XDR_DECODE);
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buf = XDR_INLINE (&xdrs, auth_len);
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if (buf != NULL)
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{
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aup->aup_time = IXDR_GET_LONG (buf);
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str_len = IXDR_GET_U_INT32 (buf);
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if (str_len > MAX_MACHINE_NAME)
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{
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stat = AUTH_BADCRED;
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goto done;
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}
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memcpy (aup->aup_machname, (caddr_t) buf, (u_int) str_len);
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aup->aup_machname[str_len] = 0;
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str_len = RNDUP (str_len);
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buf = (int32_t *) ((char *) buf + str_len);
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aup->aup_uid = IXDR_GET_LONG (buf);
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aup->aup_gid = IXDR_GET_LONG (buf);
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gid_len = IXDR_GET_U_INT32 (buf);
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if (gid_len > NGRPS)
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{
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stat = AUTH_BADCRED;
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goto done;
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}
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aup->aup_len = gid_len;
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for (i = 0; i < gid_len; i++)
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{
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aup->aup_gids[i] = IXDR_GET_LONG (buf);
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}
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/*
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* five is the smallest unix credentials structure -
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* timestamp, hostname len (0), uid, gid, and gids len (0).
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*/
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if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len)
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{
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stat = AUTH_BADCRED;
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goto done;
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}
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}
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else if (!xdr_authunix_parms (&xdrs, aup))
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{
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xdrs.x_op = XDR_FREE;
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(void) xdr_authunix_parms (&xdrs, aup);
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stat = AUTH_BADCRED;
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goto done;
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}
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/* get the verifier */
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if ((u_int)msg->rm_call.cb_verf.oa_length)
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{
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rqst->rq_xprt->xp_verf.oa_flavor =
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msg->rm_call.cb_verf.oa_flavor;
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rqst->rq_xprt->xp_verf.oa_base =
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msg->rm_call.cb_verf.oa_base;
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rqst->rq_xprt->xp_verf.oa_length =
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msg->rm_call.cb_verf.oa_length;
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}
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else
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{
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rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
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rqst->rq_xprt->xp_verf.oa_length = 0;
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}
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stat = AUTH_OK;
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done:
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XDR_DESTROY (&xdrs);
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return stat;
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}
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/*
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* Shorthand unix authenticator
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* Looks up longhand in a cache.
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*/
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/*ARGSUSED */
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enum auth_stat
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_svcauth_short (struct svc_req *rqst, struct rpc_msg *msg)
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{
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return AUTH_REJECTEDCRED;
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}
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