1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * deluser/delgroup implementation for busybox
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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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7 | * Copyright (C) 2007 by Tito Ragusa <farmatito@tiscali.it>
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8 | *
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9 | * Licensed under GPL version 2, 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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13 | #include "libbb.h"
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14 |
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15 | /* Status */
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16 | #define STATUS_OK 0
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17 | #define NAME_NOT_FOUND 1
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18 | #define MEMBER_NOT_FOUND 2
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19 |
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20 | static void del_line_matching(char **args,
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21 | const char *filename,
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22 | FILE *(*fopen_func)(const char *fileName, const char *mode))
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23 | {
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24 | FILE *passwd;
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25 | smallint error = NAME_NOT_FOUND;
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26 | char *name = (ENABLE_FEATURE_DEL_USER_FROM_GROUP && args[2]) ? args[2] : args[1];
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27 | char *line, *del;
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28 | char *new = xzalloc(1);
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29 |
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30 | passwd = fopen_func(filename, "r");
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31 | if (passwd) {
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32 | while ((line = xmalloc_fgets(passwd))) {
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33 | int len = strlen(name);
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34 |
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35 | if (strncmp(line, name, len) == 0
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36 | && line[len] == ':'
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37 | ) {
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38 | error = STATUS_OK;
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39 | if (ENABLE_FEATURE_DEL_USER_FROM_GROUP) {
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40 | struct group *gr;
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41 | char *p;
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42 | if (args[2]
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43 | /* There were two args on commandline */
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44 | && (gr = getgrnam(name))
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45 | /* The group was not deleted in the meanwhile */
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46 | && (p = strrchr(line, ':'))
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47 | /* We can find a pointer to the last ':' */
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48 | ) {
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49 | error = MEMBER_NOT_FOUND;
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50 | /* Move past ':' (worst case to '\0') and cut the line */
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51 | p[1] = '\0';
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52 | /* Reuse p */
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53 | for (p = xzalloc(1); *gr->gr_mem != NULL; gr->gr_mem++) {
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54 | /* Add all the other group members */
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55 | if (strcmp(args[1], *gr->gr_mem) != 0) {
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56 | del = p;
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57 | p = xasprintf("%s%s%s", p, p[0] ? "," : "", *gr->gr_mem);
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58 | free(del);
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59 | } else
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60 | error = STATUS_OK;
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61 | }
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62 | /* Recompose the line */
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63 | line = xasprintf("%s%s\n", line, p);
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64 | if (ENABLE_FEATURE_CLEAN_UP) free(p);
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65 | } else
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66 | goto skip;
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67 | }
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68 | }
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69 | del = new;
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70 | new = xasprintf("%s%s", new, line);
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71 | free(del);
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72 | skip:
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73 | free(line);
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74 | }
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75 |
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76 | if (ENABLE_FEATURE_CLEAN_UP) fclose(passwd);
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77 |
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78 | if (error) {
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79 | if (ENABLE_FEATURE_DEL_USER_FROM_GROUP && error == MEMBER_NOT_FOUND) {
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80 | /* Set the correct values for error message */
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81 | filename = name;
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82 | name = args[1];
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83 | }
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84 | bb_error_msg("can't find %s in %s", name, filename);
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85 | } else {
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86 | passwd = fopen_func(filename, "w");
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87 | if (passwd) {
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88 | fputs(new, passwd);
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89 | if (ENABLE_FEATURE_CLEAN_UP) fclose(passwd);
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90 | }
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91 | }
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92 | }
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93 | free(new);
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94 | }
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95 |
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96 | int deluser_main(int argc, char **argv);
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97 | int deluser_main(int argc, char **argv)
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98 | {
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99 | if (argc == 2
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100 | || (ENABLE_FEATURE_DEL_USER_FROM_GROUP
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101 | && (applet_name[3] == 'g' && argc == 3))
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102 | ) {
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103 | if (geteuid())
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104 | bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
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105 |
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106 | if ((ENABLE_FEATURE_DEL_USER_FROM_GROUP && argc != 3)
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107 | || ENABLE_DELUSER
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108 | || (ENABLE_DELGROUP && ENABLE_DESKTOP)
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109 | ) {
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110 | if (ENABLE_DELUSER
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111 | && (!ENABLE_DELGROUP || applet_name[3] == 'u')
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112 | ) {
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113 | del_line_matching(argv, bb_path_passwd_file, xfopen);
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114 | if (ENABLE_FEATURE_SHADOWPASSWDS)
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115 | del_line_matching(argv, bb_path_shadow_file, fopen_or_warn);
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116 | } else if (ENABLE_DESKTOP && ENABLE_DELGROUP && getpwnam(argv[1]))
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117 | bb_error_msg_and_die("can't remove primary group of user %s", argv[1]);
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118 | }
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119 | del_line_matching(argv, bb_path_group_file, xfopen);
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120 | if (ENABLE_FEATURE_SHADOWPASSWDS)
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121 | del_line_matching(argv, bb_path_gshadow_file, fopen_or_warn);
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122 | return EXIT_SUCCESS;
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123 | } else
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124 | bb_show_usage();
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125 | }
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