1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * getnetgrent.c 31 * 32 * - name-service switch frontend routines for the netgroup API. 33 * 34 * Policy decision: 35 * If netgroup A refers to netgroup B, both must occur in the same 36 * source (any other choice gives very confusing semantics). This 37 * assumption is deeply embedded in the code below and in the backends. 38 * 39 * innetgr() is implemented on top of something called __multi_innetgr(), 40 * which replaces each (char *) argument of innetgr() with a counted vector 41 * of (char *). The semantics are the same as an OR of the results of 42 * innetgr() operations on each possible 4-tuple picked from the arguments, 43 * but it's possible to implement some cases more efficiently. This is 44 * important for mountd, which used to read YP netgroup.byhost directly in 45 * order to determine efficiently whether a given host belonged to any one 46 * of a long list of netgroups. Wildcarded arguments are indicated by a 47 * count of zero. 48 */ 49 50 #include "lint.h" 51 #include <string.h> 52 #include <synch.h> 53 #include <nss_dbdefs.h> 54 #include <mtlib.h> 55 #include <libc.h> 56 57 static DEFINE_NSS_DB_ROOT(db_root); 58 59 void 60 _nss_initf_netgroup(p) 61 nss_db_params_t *p; 62 { 63 p->name = NSS_DBNAM_NETGROUP; 64 p->default_config = NSS_DEFCONF_NETGROUP; 65 } 66 67 /* 68 * The netgroup routines aren't quite like the majority of the switch clients. 69 * innetgr() more-or-less fits the getXXXbyYYY mould, but for the others: 70 * - setnetgrent("netgroup") is really a getXXXbyYYY routine, i.e. it 71 * searches the sources until it finds an entry with the given name. 72 * Rather than returning the (potentially large) entry, it simply 73 * initializes a cursor, and then... 74 * - getnetgrent(...) is repeatedly invoked by the user to extract the 75 * contents of the entry found by setnetgrent(). 76 * - endnetgrent() is almost like a real endXXXent routine. 77 * The behaviour in NSS was: 78 * If we were certain that all the backends could provide netgroup information 79 * in a common form, we could make the setnetgrent() backend return the entire 80 * entry to the frontend, then implement getnetgrent() and endnetgrent() 81 * strictly in the frontend (aka here). But we're not certain, so we won't. 82 * In NSS2: 83 * Since nscd returns the results, and it is nscd that accumulates 84 * the results, then we can return the entire result on the setnetgrent. 85 * 86 * NOTE: 87 * In the SunOS 4.x (YP) version of this code, innetgr() did not 88 * affect the state of {set,get,end}netgrent(). Somewhere out 89 * there probably lurks a program that depends on this behaviour, 90 * so this version (both frontend and backends) had better 91 * behave the same way. 92 */ 93 94 /* ===> ?? fix "__" name */ 95 int 96 __multi_innetgr(ngroup, pgroup, 97 nhost, phost, 98 nuser, puser, 99 ndomain, pdomain) 100 nss_innetgr_argc ngroup, nhost, nuser, ndomain; 101 nss_innetgr_argv pgroup, phost, puser, pdomain; 102 { 103 struct nss_innetgr_args ia; 104 105 if (ngroup == 0) { 106 return (0); /* One thing fewer to worry backends */ 107 } 108 109 ia.groups.argc = ngroup; 110 ia.groups.argv = pgroup; 111 ia.arg[NSS_NETGR_MACHINE].argc = nhost; 112 ia.arg[NSS_NETGR_MACHINE].argv = phost; 113 ia.arg[NSS_NETGR_USER].argc = nuser; 114 ia.arg[NSS_NETGR_USER].argv = puser; 115 ia.arg[NSS_NETGR_DOMAIN].argc = ndomain; 116 ia.arg[NSS_NETGR_DOMAIN].argv = pdomain; 117 ia.status = NSS_NETGR_NO; 118 119 (void) nss_search(&db_root, _nss_initf_netgroup, 120 NSS_DBOP_NETGROUP_IN, &ia); 121 return (ia.status == NSS_NETGR_FOUND); 122 } 123 124 int 125 innetgr(group, host, user, domain) 126 const char *group, *host, *user, *domain; 127 { 128 #define IA(charp) \ 129 (nss_innetgr_argc)((charp) != 0), (nss_innetgr_argv)(&(charp)) 130 131 return (__multi_innetgr(IA(group), IA(host), IA(user), IA(domain))); 132 } 133 134 /* 135 * Context for setnetgrent()/getnetgrent(). If the user is being sensible 136 * the requests will be serialized anyway, but let's play safe and 137 * serialize them ourselves (anything to prevent a coredump)... 138 * We can't use lmutex_lock() here because we don't know what the backends 139 * that we call may call in turn. They might call malloc()/free(). 140 * So we use the brute-force callout_lock_enter() instead. 141 */ 142 static nss_backend_t *getnetgrent_backend; 143 144 int 145 setnetgrent(const char *netgroup) 146 { 147 nss_backend_t *be; 148 149 if (netgroup == NULL) { 150 /* Prevent coredump, otherwise don't do anything profound */ 151 netgroup = ""; 152 } 153 154 callout_lock_enter(); 155 be = getnetgrent_backend; 156 if (be != NULL && NSS_INVOKE_DBOP(be, NSS_DBOP_SETENT, 157 (void *)netgroup) != NSS_SUCCESS) { 158 (void) NSS_INVOKE_DBOP(be, NSS_DBOP_DESTRUCTOR, 0); 159 be = NULL; 160 } 161 if (be == NULL) { 162 struct nss_setnetgrent_args args; 163 164 args.netgroup = netgroup; 165 args.iterator = 0; 166 (void) nss_search(&db_root, _nss_initf_netgroup, 167 NSS_DBOP_NETGROUP_SET, &args); 168 be = args.iterator; 169 } 170 getnetgrent_backend = be; 171 callout_lock_exit(); 172 return (0); 173 } 174 175 int 176 getnetgrent_r(machinep, namep, domainp, buffer, buflen) 177 char **machinep; 178 char **namep; 179 char **domainp; 180 char *buffer; 181 int buflen; 182 { 183 struct nss_getnetgrent_args args; 184 185 args.buffer = buffer; 186 args.buflen = buflen; 187 args.status = NSS_NETGR_NO; 188 189 callout_lock_enter(); 190 if (getnetgrent_backend != 0) { 191 (void) NSS_INVOKE_DBOP(getnetgrent_backend, 192 NSS_DBOP_GETENT, &args); 193 } 194 callout_lock_exit(); 195 196 if (args.status == NSS_NETGR_FOUND) { 197 *machinep = args.retp[NSS_NETGR_MACHINE]; 198 *namep = args.retp[NSS_NETGR_USER]; 199 *domainp = args.retp[NSS_NETGR_DOMAIN]; 200 return (1); 201 } else { 202 return (0); 203 } 204 } 205 206 static nss_XbyY_buf_t *buf; 207 208 int 209 getnetgrent(machinep, namep, domainp) 210 char **machinep; 211 char **namep; 212 char **domainp; 213 { 214 (void) NSS_XbyY_ALLOC(&buf, 0, NSS_BUFLEN_NETGROUP); 215 return (getnetgrent_r(machinep, namep, domainp, 216 buf->buffer, buf->buflen)); 217 } 218 219 int 220 endnetgrent() 221 { 222 callout_lock_enter(); 223 if (getnetgrent_backend != 0) { 224 (void) NSS_INVOKE_DBOP(getnetgrent_backend, 225 NSS_DBOP_DESTRUCTOR, 0); 226 getnetgrent_backend = 0; 227 } 228 callout_lock_exit(); 229 nss_delete(&db_root); /* === ? */ 230 NSS_XbyY_FREE(&buf); 231 return (0); 232 } 233