[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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[1770] | 3 | * addgroup - add groups to /etc/group and /etc/gshadow
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[821] | 4 | *
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| 5 | * Copyright (C) 1999 by Lineo, inc. and John Beppu
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| 6 | * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
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[1770] | 7 | * Copyright (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
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[821] | 8 | *
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| 9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 10 | *
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| 11 | */
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| 12 |
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[1770] | 13 | #include "libbb.h"
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[821] | 14 |
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[1770] | 15 | static void xgroup_study(struct group *g)
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[821] | 16 | {
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[1770] | 17 | /* Make sure gr_name is unused */
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| 18 | if (getgrnam(g->gr_name)) {
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| 19 | goto error;
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| 20 | }
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[821] | 21 |
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[1770] | 22 | /* Check if the desired gid is free
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| 23 | * or find the first free one */
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| 24 | while (1) {
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| 25 | if (!getgrgid(g->gr_gid)) {
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| 26 | return; /* found free group: return */
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[821] | 27 | }
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[1770] | 28 | if (option_mask32) {
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| 29 | /* -g N, cannot pick gid other than N: error */
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| 30 | g->gr_name = itoa(g->gr_gid);
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| 31 | goto error;
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[821] | 32 | }
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[1770] | 33 | g->gr_gid++;
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| 34 | if (g->gr_gid <= 0) {
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| 35 | /* overflowed: error */
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| 36 | bb_error_msg_and_die("no gids left");
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[821] | 37 | }
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| 38 | }
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| 39 |
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[1770] | 40 | error:
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| 41 | /* exit */
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| 42 | bb_error_msg_and_die("group %s already exists", g->gr_name);
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[821] | 43 | }
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| 44 |
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| 45 | /* append a new user to the passwd file */
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[1770] | 46 | static void new_group(char *group, gid_t gid)
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[821] | 47 | {
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| 48 | FILE *file;
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| 49 | struct group gr;
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| 50 |
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| 51 | /* make sure gid and group haven't already been allocated */
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| 52 | gr.gr_gid = gid;
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| 53 | gr.gr_name = group;
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[1770] | 54 | xgroup_study(&gr);
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[821] | 55 |
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| 56 | /* add entry to group */
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[1770] | 57 | file = xfopen(bb_path_group_file, "a");
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[821] | 58 | /* group:passwd:gid:userlist */
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[1770] | 59 | fprintf(file, "%s:x:%d:\n", group, gr.gr_gid);
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| 60 | if (ENABLE_FEATURE_CLEAN_UP)
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| 61 | fclose(file);
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[821] | 62 | #if ENABLE_FEATURE_SHADOWPASSWDS
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[1770] | 63 | file = fopen_or_warn(bb_path_gshadow_file, "a");
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| 64 | if (file) {
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| 65 | fprintf(file, "%s:!::\n", group);
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| 66 | if (ENABLE_FEATURE_CLEAN_UP)
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| 67 | fclose(file);
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| 68 | }
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[821] | 69 | #endif
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[1770] | 70 | }
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[821] | 71 |
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[1770] | 72 | #if ENABLE_FEATURE_ADDUSER_TO_GROUP
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| 73 | static void add_user_to_group(char **args,
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| 74 | const char *path,
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| 75 | FILE *(*fopen_func)(const char *fileName, const char *mode))
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| 76 | {
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| 77 | char *line;
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| 78 | int len = strlen(args[1]);
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| 79 | llist_t *plist = NULL;
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| 80 | FILE *group_file;
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| 81 |
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| 82 | group_file = fopen_func(path, "r");
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| 83 |
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| 84 | if (!group_file) return;
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| 85 |
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| 86 | while ((line = xmalloc_getline(group_file))) {
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| 87 | /* Find the group */
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| 88 | if (!strncmp(line, args[1], len)
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| 89 | && line[len] == ':'
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| 90 | ) {
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| 91 | /* Add the new user */
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| 92 | line = xasprintf("%s%s%s", line,
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| 93 | last_char_is(line, ':') ? "" : ",",
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| 94 | args[0]);
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| 95 | }
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| 96 | llist_add_to_end(&plist, line);
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| 97 | }
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| 98 |
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| 99 | if (ENABLE_FEATURE_CLEAN_UP) {
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| 100 | fclose(group_file);
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| 101 | group_file = fopen_func(path, "w");
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| 102 | while ((line = llist_pop(&plist))) {
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| 103 | if (group_file)
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| 104 | fprintf(group_file, "%s\n", line);
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| 105 | free(line);
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| 106 | }
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| 107 | if (group_file)
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| 108 | fclose(group_file);
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| 109 | } else {
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| 110 | group_file = fopen_func(path, "w");
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| 111 | if (group_file)
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| 112 | while ((line = llist_pop(&plist)))
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| 113 | fprintf(group_file, "%s\n", line);
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| 114 | }
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[821] | 115 | }
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[1770] | 116 | #endif
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[821] | 117 |
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| 118 | /*
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| 119 | * addgroup will take a login_name as its first parameter.
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| 120 | *
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[1770] | 121 | * gid can be customized via command-line parameters.
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| 122 | * If called with two non-option arguments, addgroup
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| 123 | * will add an existing user to an existing group.
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| 124 | */
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| 125 | int addgroup_main(int argc, char **argv);
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[821] | 126 | int addgroup_main(int argc, char **argv)
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| 127 | {
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| 128 | char *group;
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| 129 | gid_t gid = 0;
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| 130 |
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[1770] | 131 | /* need to be root */
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| 132 | if (geteuid()) {
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| 133 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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[821] | 134 | }
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[1770] | 135 |
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| 136 | /* Syntax:
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| 137 | * addgroup group
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| 138 | * addgroup -g num group
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| 139 | * addgroup user group
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| 140 | * Check for min, max and missing args */
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| 141 | opt_complementary = "-1:?2";
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| 142 | if (getopt32(argv, "g:", &group)) {
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| 143 | gid = xatoul_range(group, 0, ((unsigned long)(gid_t)ULONG_MAX) >> 1);
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| 144 | }
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[821] | 145 | /* move past the commandline options */
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| 146 | argv += optind;
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[1770] | 147 | argc -= optind;
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[821] | 148 |
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[1770] | 149 | #if ENABLE_FEATURE_ADDUSER_TO_GROUP
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| 150 | if (argc == 2) {
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| 151 | struct group *gr;
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[821] | 152 |
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[1770] | 153 | if (option_mask32) {
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| 154 | /* -g was there, but "addgroup -g num user group"
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| 155 | * is a no-no */
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| 156 | bb_show_usage();
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| 157 | }
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| 158 |
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| 159 | /* check if group and user exist */
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| 160 | xuname2uid(argv[0]); /* unknown user: exit */
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| 161 | xgroup2gid(argv[1]); /* unknown group: exit */
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| 162 | /* check if user is already in this group */
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| 163 | gr = getgrnam(argv[1]);
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| 164 | for (; *(gr->gr_mem) != NULL; (gr->gr_mem)++) {
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| 165 | if (!strcmp(argv[0], *(gr->gr_mem))) {
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| 166 | /* user is already in group: do nothing */
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| 167 | return EXIT_SUCCESS;
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| 168 | }
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| 169 | }
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| 170 | add_user_to_group(argv, bb_path_group_file, xfopen);
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| 171 | #if ENABLE_FEATURE_SHADOWPASSWDS
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| 172 | add_user_to_group(argv, bb_path_gshadow_file, fopen_or_warn);
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| 173 | #endif /* ENABLE_FEATURE_SHADOWPASSWDS */
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| 174 | } else
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| 175 | #endif /* ENABLE_FEATURE_ADDUSER_TO_GROUP */
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| 176 | new_group(argv[0], gid);
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| 177 |
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| 178 | /* Reached only on success */
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| 179 | return EXIT_SUCCESS;
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[821] | 180 | }
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