1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
|
/*
* Copyright (c) 2017 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STDBOOL_H
# include <stdbool.h>
#else
# include "compat/stdbool.h"
#endif /* HAVE_STDBOOL_H */
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRINGS_H */
#include <ctype.h>
#include <time.h>
#include "sudo_compat.h"
#include "sudoers_debug.h"
#include "parse.h"
/*
* Parse a timestamp in Generalized Time format as per RFC4517.
* E.g. yyyymmddHHMMSS.FZ or yyyymmddHHMMSS.F[+-]TZOFF
* where minutes, seconds and fraction are optional.
* Returns the time in Unix time format or -1 on error.
*/
time_t
parse_gentime(const char *timestr)
{
char tcopy[sizeof("yyyymmddHHMMSS.F")];
const char *cp;
time_t result;
struct tm tm;
size_t len;
int items, tzoff = 0;
bool islocal = false;
debug_decl(parse_gentime, SUDOERS_DEBUG_PARSER)
/* Make a copy of the time without time zone for easy parsing. */
len = strspn(timestr, "0123456789.,");
if (len >= sizeof(tcopy)) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"unable to parse general time string %s", timestr);
debug_return_time_t(-1);
}
memcpy(tcopy, timestr, len);
tcopy[len] = '\0';
/* Parse general time, ignoring the timezone for now. */
memset(&tm, 0, sizeof(tm));
items = sscanf(tcopy, "%4d%2d%2d%2d%2d%2d", &tm.tm_year, &tm.tm_mon,
&tm.tm_mday, &tm.tm_hour, &tm.tm_min, &tm.tm_sec);
if (items == EOF || items < 4) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"only parsed %d items in general time string %s", items, timestr);
debug_return_time_t(-1);
}
cp = timestr + ((items + 1) * 2);
/* Parse optional fractional hours/minute/second if present. */
if ((cp[0] == '.' || cp[0] == ',') && isdigit((unsigned char)cp[1])) {
int frac = cp[1] - '0';
switch (items) {
case 4:
/* convert fractional hour -> minutes */
tm.tm_min += 60 / 10 * frac;
break;
case 5:
/* convert fractional minute -> seconds */
tm.tm_sec += 60 / 10 * frac;
break;
case 6:
/* ignore fractional second */
break;
}
cp += 2; /* skip over radix and fraction */
}
switch (*cp) {
case '-':
case '+': {
int hour = 0, min = 0;
/* No DST */
tm.tm_isdst = 0;
/* parse time zone offset */
items = sscanf(cp + 1, "%2d%2d", &hour, &min);
if (items == EOF || items < 1) {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"unable to parse time zone offset in %s, items %d",
timestr, items);
debug_return_time_t(-1);
}
if (*cp == '-')
tzoff = -((hour * 60) + min) * 60;
else
tzoff = ((hour * 60) + min) * 60;
cp += 1 + (items * 2);
break;
}
case 'Z':
/* GMT/UTC, no DST */
tm.tm_isdst = 0;
cp++;
break;
case '\0':
/* no zone specified, use local time */
tm.tm_isdst = -1;
islocal = true;
break;
default:
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"unable to parse general time string %s", timestr);
debug_return_time_t(-1);
}
if (*cp != '\0') {
sudo_debug_printf(SUDO_DEBUG_ERROR|SUDO_DEBUG_LINENO,
"trailing garbage in general time string %s", timestr);
debug_return_time_t(-1);
}
/* Adjust from Generalized Time to struct tm */
tm.tm_year -= 1900;
tm.tm_mon--;
result = mktime(&tm);
if (result != -1) {
if (!islocal) {
/* Not local time, convert to GMT */
result += get_gmtoff(&result);
/* Adjust time based on supplied GMT offset. */
result -= tzoff;
}
}
debug_return_time_t(result);
}
|
