1 /* $OpenBSD: user.c,v 1.22 2020/04/16 17:51:56 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
free_user(user * u)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 job_remove(e, u);
45 free_entry(e);
46 }
47 free(u->name);
48 free(u);
49 }
50
51 static int ParseErrorCount;
52 static const char *CrontabFilename;
53
54 static void
parse_error(const char * msg)55 parse_error(const char *msg)
56 {
57 ParseErrorCount++;
58 syslog(LOG_ERR, "(CRON) %s:%d (%s)", CrontabFilename, LineNumber, msg);
59 }
60
61 user *
load_user(FILE * file,struct passwd * pw,const char * name)62 load_user(FILE *file, struct passwd *pw, const char *name)
63 {
64 char envstr[MAX_ENVSTR];
65 user *u;
66 entry *e;
67 int status, save_errno;
68 char **envp = NULL, **tenvp;
69
70 CrontabFilename = name;
71 LineNumber = 0;
72
73 /* file is open. build user entry, then read the crontab file.
74 */
75 if ((u = malloc(sizeof(user))) == NULL)
76 goto done;
77 if ((u->name = strdup(name)) == NULL) {
78 save_errno = errno;
79 free(u);
80 u = NULL;
81 errno = save_errno;
82 goto done;
83 }
84 SLIST_INIT(&u->crontab);
85
86 /* init environment. this will be copied/augmented for each entry.
87 */
88 if ((envp = env_init()) == NULL) {
89 save_errno = errno;
90 free_user(u);
91 u = NULL;
92 errno = save_errno;
93 goto done;
94 }
95
96 /* load the crontab
97 */
98 ParseErrorCount = 0;
99 while ((status = load_env(envstr, file)) >= 0) {
100 switch (status) {
101 case FALSE:
102 /* Not an env variable, parse as crontab entry. */
103 e = load_entry(file, parse_error, pw, envp);
104 if (e == NULL) {
105 /* Parse error, ignore for non-root entries */
106 if (pw != NULL) {
107 save_errno = errno;
108 free_user(u);
109 u = NULL;
110 errno = save_errno;
111 goto done;
112 }
113 } else {
114 SLIST_INSERT_HEAD(&u->crontab, e, entries);
115 }
116 break;
117 case TRUE:
118 if ((tenvp = env_set(envp, envstr)) == NULL) {
119 save_errno = errno;
120 free_user(u);
121 u = NULL;
122 errno = save_errno;
123 goto done;
124 }
125 envp = tenvp;
126 break;
127 }
128 }
129
130 done:
131 if (envp != NULL)
132 env_free(envp);
133 return (u);
134 }
135