1 /* $OpenBSD: user.c,v 1.20 2017/06/07 23:36:43 millert Exp $ */ 2 3 /* Copyright 1988,1990,1993,1994 by Paul Vixie 4 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC") 5 * Copyright (c) 1997,2000 by Internet Software Consortium, Inc. 6 * 7 * Permission to use, copy, modify, and distribute this software for any 8 * purpose with or without fee is hereby granted, provided that the above 9 * copyright notice and this permission notice appear in all copies. 10 * 11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES 12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR 14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT 17 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 18 */ 19 20 #include <sys/types.h> 21 22 #include <bitstring.h> /* for structs.h */ 23 #include <ctype.h> 24 #include <errno.h> 25 #include <pwd.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <syslog.h> 30 #include <time.h> /* for structs.h */ 31 32 #include "macros.h" 33 #include "structs.h" 34 #include "funcs.h" 35 #include "globals.h" 36 37 void 38 free_user(user *u) 39 { 40 entry *e; 41 42 while ((e = SLIST_FIRST(&u->crontab))) { 43 SLIST_REMOVE_HEAD(&u->crontab, entries); 44 free_entry(e); 45 } 46 free(u->name); 47 free(u); 48 } 49 50 static int ParseErrorCount; 51 static const char *CrontabFilename; 52 53 static void 54 parse_error(const char *msg) 55 { 56 ParseErrorCount++; 57 syslog(LOG_ERR, "(CRON) %s:%d (%s)", CrontabFilename, LineNumber, msg); 58 } 59 60 user * 61 load_user(int crontab_fd, struct passwd *pw, const char *name) 62 { 63 char envstr[MAX_ENVSTR]; 64 FILE *file; 65 user *u; 66 entry *e; 67 int status, save_errno; 68 char **envp = NULL, **tenvp; 69 70 if (!(file = fdopen(crontab_fd, "r"))) { 71 syslog(LOG_ERR, "(%s) FDOPEN (%m)", name); 72 return (NULL); 73 } 74 CrontabFilename = name; 75 LineNumber = 0; 76 77 /* file is open. build user entry, then read the crontab file. 78 */ 79 if ((u = malloc(sizeof(user))) == NULL) 80 goto done; 81 if ((u->name = strdup(name)) == NULL) { 82 save_errno = errno; 83 free(u); 84 u = NULL; 85 errno = save_errno; 86 goto done; 87 } 88 SLIST_INIT(&u->crontab); 89 90 /* init environment. this will be copied/augmented for each entry. 91 */ 92 if ((envp = env_init()) == NULL) { 93 save_errno = errno; 94 free_user(u); 95 u = NULL; 96 errno = save_errno; 97 goto done; 98 } 99 100 /* load the crontab 101 */ 102 ParseErrorCount = 0; 103 while ((status = load_env(envstr, file)) >= 0) { 104 switch (status) { 105 case FALSE: 106 /* Not an env variable, parse as crontab entry. */ 107 e = load_entry(file, parse_error, pw, envp); 108 if (e == NULL) { 109 /* Parse error, ignore for non-root entries */ 110 if (pw != NULL) { 111 save_errno = errno; 112 free_user(u); 113 u = NULL; 114 errno = save_errno; 115 goto done; 116 } 117 } else { 118 SLIST_INSERT_HEAD(&u->crontab, e, entries); 119 } 120 break; 121 case TRUE: 122 if ((tenvp = env_set(envp, envstr)) == NULL) { 123 save_errno = errno; 124 free_user(u); 125 u = NULL; 126 errno = save_errno; 127 goto done; 128 } 129 envp = tenvp; 130 break; 131 } 132 } 133 134 done: 135 if (envp != NULL) 136 env_free(envp); 137 fclose(file); 138 return (u); 139 } 140