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
37void
38free_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
51static int ParseErrorCount;
52static const char *CrontabFilename;
53
54static void
55parse_error(const char *msg)
56{
57	ParseErrorCount++;
58	syslog(LOG_ERR, "(CRON) %s:%d (%s)", CrontabFilename, LineNumber, msg);
59}
60
61user *
62load_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