1 /*- 2 * Copyright (C) 1996 3 * David L. Nugent. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: src/usr.sbin/pw/edgroup.c,v 1.8 1999/08/28 01:19:16 peter Exp $ 27 * $DragonFly: src/usr.sbin/pw/edgroup.c,v 1.2 2003/06/17 04:30:01 dillon Exp $ 28 */ 29 30 #include <stdio.h> 31 #include <stdlib.h> 32 #include <string.h> 33 #include <unistd.h> 34 #include <stdarg.h> 35 #include <sys/types.h> 36 #include <sys/stat.h> 37 #include <pwd.h> 38 #include <grp.h> 39 #include <fcntl.h> 40 #include <sys/param.h> 41 #include <ctype.h> 42 43 #include "pwupd.h" 44 45 static int 46 isingroup(char const * name, char **mem) 47 { 48 int i; 49 50 for (i = 0; mem[i] != NULL; i++) 51 if (strcmp(name, mem[i]) == 0) 52 return i; 53 return -1; 54 } 55 56 int 57 editgroups(char *name, char **groups) 58 { 59 int rc = 0; 60 int infd; 61 char groupfile[MAXPATHLEN]; 62 char grouptmp[MAXPATHLEN]; 63 64 strncpy(groupfile, getgrpath(_GROUP), MAXPATHLEN - 5); 65 groupfile[MAXPATHLEN - 5] = '\0'; 66 strcpy(grouptmp, groupfile); 67 strcat(grouptmp, ".new"); 68 69 if ((infd = open(groupfile, O_RDWR | O_CREAT, 0644)) != -1) { 70 FILE *infp; 71 72 if ((infp = fdopen(infd, "r+")) == NULL) 73 close(infd); 74 else { 75 int outfd; 76 77 if ((outfd = open(grouptmp, O_RDWR | O_CREAT | O_TRUNC | O_EXLOCK, 0644)) != -1) { 78 FILE *outfp; 79 80 if ((outfp = fdopen(outfd, "w+")) == NULL) 81 close(outfd); 82 else { 83 int linelen = PWBUFSZ; 84 int outlen = PWBUFSZ; 85 int memlen = 200; /* Arbitrary */ 86 char *line = malloc(linelen); 87 char *outl = malloc(outlen); 88 char **mems = malloc(memlen * sizeof(char *)); 89 int namlen = strlen(name); 90 91 if (line == NULL || outl == NULL || mems == NULL) { 92 mem_abort: 93 rc = 0; 94 } else { 95 while (fgets(line, linelen, infp) != NULL) { 96 char *p; 97 int l; 98 99 while ((p = strchr(line, '\n')) == NULL) 100 { 101 if (extendline(&line, &linelen, linelen + PWBUFSZ) == -1) { 102 goto mem_abort; 103 } 104 l = strlen(line); 105 if (fgets(line + l, linelen - l, infp) == NULL) 106 break; /* No newline terminator on last line */ 107 } 108 l = strlen(line) + namlen + 1; 109 if (extendline(&outl, &outlen, l) == -1) { 110 goto mem_abort; 111 } 112 if (*line == '#') 113 strcpy(outl, line); 114 else if (*line == '\n') 115 *outl = '\0'; 116 else { 117 int i, 118 mno = 0; 119 char *cp = line; 120 char const *sep = ":\n"; 121 struct group grp; 122 123 memset(&grp, 0, sizeof grp); 124 for (i = 0; (p = strsep(&cp, sep)) != NULL; i++) { 125 switch (i) { 126 case 0: /* Group name */ 127 grp.gr_name = p; 128 break; 129 case 1: /* Group password */ 130 grp.gr_passwd = p; 131 break; 132 case 2: /* Group id */ 133 grp.gr_gid = atoi(p); 134 break; 135 case 3: /* Member list */ 136 cp = p; 137 sep = ",\n"; 138 break; 139 default: /* Individual members */ 140 if (*p) { 141 if (extendarray(&mems, &memlen, mno + 2) == -1) { 142 goto mem_abort; 143 } 144 mems[mno++] = p; 145 } 146 break; 147 } 148 } 149 if (i < 2) /* Bail out - insufficient fields */ 150 continue; 151 152 grp.gr_mem = mems; 153 for (i = mno; i < memlen; i++) 154 mems[i] = NULL; 155 156 /* 157 * Delete from group, or add to group? 158 */ 159 if (groups == NULL || isingroup(grp.gr_name, groups) == -1) { /* Delete */ 160 int idx; 161 162 while ((idx = isingroup(name, mems)) != -1) { 163 for (i = idx; i < (memlen - 1); i++) 164 mems[i] = mems[i + 1]; 165 mems[i] = NULL; 166 --mno; 167 } 168 /* 169 * Special case - deleting user and group may be user's own 170 */ 171 if (groups == NULL && mems[0] == NULL && strcmp(name, grp.gr_name) == 0) { 172 /* 173 * First, make _sure_ we don't have other members 174 */ 175 struct passwd *pwd; 176 177 SETPWENT(); 178 while ((pwd = GETPWENT()) != NULL && (gid_t)pwd->pw_gid != (gid_t)grp.gr_gid); 179 ENDPWENT(); 180 if (pwd == NULL) /* No members at all */ 181 continue; /* Drop the group */ 182 } 183 } else if (isingroup(name, mems) == -1) { 184 if (extendarray(&mems, &memlen, mno + 2) == -1) { 185 goto mem_abort; 186 } 187 grp.gr_mem = mems; /* May have realloced() */ 188 mems[mno++] = name; 189 mems[mno ] = NULL; 190 } 191 fmtgrentry(&outl, &outlen, &grp, PWF_GROUP); 192 } 193 fputs(outl, outfp); 194 } 195 if (fflush(outfp) != EOF) { 196 rc = 1; 197 198 /* 199 * Copy data back into the original file and truncate 200 */ 201 rewind(infp); 202 rewind(outfp); 203 while (fgets(outl, outlen, outfp) != NULL) 204 fputs(outl, infp); 205 206 /* 207 * This is a gross hack, but we may have corrupted the 208 * original file. Unfortunately, it will lose preservation 209 * of the inode. 210 */ 211 if (fflush(infp) == EOF || ferror(infp)) 212 rc = rename(grouptmp, groupfile) == 0; 213 else 214 ftruncate(infd, ftell(infp)); 215 } 216 } 217 free(mems); 218 free(outl); 219 free(line); 220 fclose(outfp); 221 } 222 remove(grouptmp); 223 } 224 fclose(infp); 225 } 226 } 227 return rc; 228 } 229