1 | /*
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2 | Copyright (c) 2001-2006, Gerrit Pape
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3 | All rights reserved.
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4 |
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5 | Redistribution and use in source and binary forms, with or without
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6 | modification, are permitted provided that the following conditions are met:
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7 |
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8 | 1. Redistributions of source code must retain the above copyright notice,
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9 | this list of conditions and the following disclaimer.
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10 | 2. Redistributions in binary form must reproduce the above copyright
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11 | notice, this list of conditions and the following disclaimer in the
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12 | documentation and/or other materials provided with the distribution.
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13 | 3. The name of the author may not be used to endorse or promote products
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14 | derived from this software without specific prior written permission.
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15 |
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16 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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17 | WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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18 | MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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19 | EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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20 | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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21 | PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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22 | OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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23 | WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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24 | OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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25 | ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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26 | */
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27 |
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28 | #include "libbb.h"
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29 |
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30 | /* Always sets uid and gid */
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31 | int get_uidgid(struct bb_uidgid_t *u, const char *ug, int numeric_ok)
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32 | {
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33 | struct passwd *pwd;
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34 | struct group *gr;
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35 | char *user, *group;
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36 | unsigned n;
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37 |
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38 | user = (char*)ug;
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39 | group = strchr(ug, ':');
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40 | if (group) {
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41 | int sz = (++group) - ug;
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42 | user = alloca(sz);
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43 | /* copies sz-1 bytes, stores terminating '\0' */
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44 | safe_strncpy(user, ug, sz);
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45 | }
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46 | if (numeric_ok) {
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47 | n = bb_strtou(user, NULL, 10);
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48 | if (!errno) {
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49 | u->uid = n;
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50 | pwd = getpwuid(n);
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51 | /* If we have e.g. "500" string without user */
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52 | /* with uid 500 in /etc/passwd, we set gid == uid */
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53 | u->gid = pwd ? pwd->pw_gid : n;
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54 | goto skip;
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55 | }
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56 | }
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57 | /* Either it is not numeric, or caller disallows numeric username */
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58 | pwd = getpwnam(user);
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59 | if (!pwd)
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60 | return 0;
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61 | u->uid = pwd->pw_uid;
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62 | u->gid = pwd->pw_gid;
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63 |
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64 | skip:
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65 | if (group) {
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66 | if (numeric_ok) {
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67 | n = bb_strtou(group, NULL, 10);
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68 | if (!errno) {
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69 | u->gid = n;
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70 | return 1;
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71 | }
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72 | }
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73 | gr = getgrnam(group);
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74 | if (!gr) return 0;
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75 | u->gid = gr->gr_gid;
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76 | }
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77 | return 1;
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78 | }
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79 |
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80 | /* chown-like:
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81 | * "user" sets uid only,
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82 | * ":group" sets gid only
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83 | * "user:" sets uid and gid (to user's primary group id)
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84 | * "user:group" sets uid and gid
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85 | * ('unset' uid or gid is actually set to -1)
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86 | */
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87 | void parse_chown_usergroup_or_die(struct bb_uidgid_t *u, char *user_group)
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88 | {
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89 | char *group;
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90 |
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91 | u->uid = -1;
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92 | u->gid = -1;
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93 |
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94 | /* Check if there is a group name */
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95 | group = strchr(user_group, '.'); /* deprecated? */
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96 | if (!group)
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97 | group = strchr(user_group, ':');
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98 | else
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99 | *group = ':'; /* replace '.' with ':' */
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100 |
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101 | /* Parse "user[:[group]]" */
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102 | if (!group) { /* "user" */
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103 | u->uid = get_ug_id(user_group, xuname2uid);
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104 | } else if (group == user_group) { /* ":group" */
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105 | u->gid = get_ug_id(group + 1, xgroup2gid);
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106 | } else {
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107 | if (!group[1]) /* "user:" */
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108 | *group = '\0';
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109 | if (!get_uidgid(u, user_group, 1))
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110 | bb_error_msg_and_die("unknown user/group %s", user_group);
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111 | }
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112 | }
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113 |
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114 | #if 0
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115 | #include <stdio.h>
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116 | int main()
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117 | {
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118 | unsigned u;
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119 | struct bb_uidgid_t ug;
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120 | u = get_uidgid(&ug, "apache", 0);
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121 | printf("%u = %u:%u\n", u, ug.uid, ug.gid);
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122 | ug.uid = ug.gid = 1111;
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123 | u = get_uidgid(&ug, "apache", 0);
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124 | printf("%u = %u:%u\n", u, ug.uid, ug.gid);
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125 | ug.uid = ug.gid = 1111;
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126 | u = get_uidgid(&ug, "apache:users", 0);
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127 | printf("%u = %u:%u\n", u, ug.uid, ug.gid);
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128 | ug.uid = ug.gid = 1111;
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129 | u = get_uidgid(&ug, "apache:users", 0);
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130 | printf("%u = %u:%u\n", u, ug.uid, ug.gid);
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131 | return 0;
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132 | }
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133 | #endif
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