Mercurial > hg > toybox
annotate toys/other/login.c @ 674:7e846e281e38
New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
author | Rob Landley <rob@landley.net> |
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date | Mon, 08 Oct 2012 00:02:30 -0500 |
parents | 6df4ccc0acbe |
children | 786841fdb1e0 |
rev | line source |
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1 /* vi: set sw=4 ts=4: |
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2 * |
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3 * login.c - Start a session on the system. |
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4 * |
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5 * Copyright 2012 Elie De Brauwer <eliedebrauwer@gmail.com> |
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6 * |
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7 * No support for PAM/securetty/selinux/login script/issue/utmp |
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8 * Relies on libcrypt for hash calculation. |
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9 |
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10 USE_LOGIN(NEWTOY(login, ">1fph:", TOYFLAG_BIN)) |
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11 |
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12 config LOGIN |
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13 bool "login" |
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14 default y |
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15 help |
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16 usage: login [-p] [-h host] [[-f] username] |
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17 |
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18 Establish a new session with the system. |
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19 -p Preserve environment |
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20 -h The name of the remote host for this login |
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21 -f Do not perform authentication |
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22 */ |
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23 |
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24 #define FOR_login |
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25 #include "toys.h" |
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26 |
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27 #define LOGIN_TIMEOUT 60 |
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28 #define LOGIN_FAIL_TIMEOUT 3 |
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29 #define USER_NAME_MAX_SIZE 32 |
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30 #define HOSTNAME_SIZE 32 |
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31 |
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32 GLOBALS( |
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33 char *hostname; |
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34 ) |
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35 |
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36 static void login_timeout_handler(int sig __attribute__((unused))) |
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37 { |
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38 printf("\nLogin timed out after %d seconds.\n", LOGIN_TIMEOUT); |
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39 exit(0); |
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40 } |
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41 |
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42 static char *forbid[] = { |
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43 "BASH_ENV", |
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44 "ENV", |
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45 "HOME", |
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46 "IFS", |
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47 "LD_LIBRARY_PATH", |
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48 "LD_PRELOAD", |
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49 "LD_TRACE_LOADED_OBJECTS", |
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50 "LD_BIND_NOW", |
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51 "LD_AOUT_LIBRARY_PATH", |
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52 "LD_AOUT_PRELOAD", |
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53 "LD_NOWARN", |
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54 "LD_KEEPDIR", |
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55 "SHELL", |
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56 NULL |
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57 }; |
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58 |
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59 int verify_password(char * pwd) |
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60 { |
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61 char *pass; |
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62 |
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63 if (read_password(toybuf, sizeof(toybuf), "Password: ")) return 1; |
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64 if (!pwd) return 1; |
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65 if (pwd[0] == '!' || pwd[0] == '*') return 1; |
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66 |
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67 pass = crypt(toybuf, pwd); |
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68 if (pass && !strcmp(pass, pwd)) return 0; |
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69 |
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70 return 1; |
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71 } |
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72 |
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73 void read_user(char * buff, int size) |
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74 { |
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75 char hostname[HOSTNAME_SIZE+1]; |
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76 int i = 0; |
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77 hostname[HOSTNAME_SIZE] = 0; |
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78 if(!gethostname(hostname, HOSTNAME_SIZE)) fputs(hostname, stdout); |
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79 |
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80 fputs(" login: ", stdout); |
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81 fflush(stdout); |
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82 |
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83 do { |
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84 buff[0] = getchar(); |
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85 if (buff[0] == EOF) |
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86 exit(EXIT_FAILURE); |
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87 } while (isblank(buff[0])); |
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88 |
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89 if (buff[0] != '\n') |
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90 if(!fgets(&buff[1], HOSTNAME_SIZE-1, stdin)) |
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91 _exit(1); |
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92 |
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93 while(i<HOSTNAME_SIZE-1 && isgraph(buff[i])) i++; |
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94 buff[i] = 0; |
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95 } |
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96 |
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97 void handle_nologin(void) |
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98 { |
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99 int fd = open("/etc/nologin", O_RDONLY); |
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100 int size; |
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101 if (fd == -1) return; |
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102 |
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103 size = readall(fd, toybuf,sizeof(toybuf)-1); |
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104 toybuf[size] = 0; |
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105 if (!size) puts("System closed for routine maintenance\n"); |
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106 else puts(toybuf); |
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107 |
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108 close(fd); |
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109 fflush(stdout); |
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110 exit(EXIT_FAILURE); |
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111 } |
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112 |
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113 void handle_motd(void) |
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114 { |
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115 int fd = open("/etc/motd", O_RDONLY); |
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116 int size; |
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117 if (fd == -1) return; |
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118 |
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119 size = readall(fd, toybuf,sizeof(toybuf)-1); |
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120 toybuf[size] = 0; |
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121 puts(toybuf); |
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122 |
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123 close(fd); |
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124 fflush(stdout); |
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125 } |
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126 |
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127 int change_identity(const struct passwd *pwd) |
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128 { |
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129 if (initgroups(pwd->pw_name,pwd->pw_gid)) return 1; |
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130 if (setgid(pwd->pw_uid)) return 1; |
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131 if (setuid(pwd->pw_uid)) return 1; |
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132 |
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133 return 0; |
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134 } |
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135 |
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136 void spawn_shell(const char *shell) |
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137 { |
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138 const char * exec_name = strrchr(shell,'/'); |
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139 if (exec_name) exec_name++; |
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140 else exec_name = shell; |
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141 |
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142 snprintf(toybuf,sizeof(toybuf)-1, "-%s", shell); |
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143 execl(shell, toybuf, NULL); |
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144 error_exit("Failed to spawn shell"); |
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145 } |
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146 |
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147 void setup_environment(const struct passwd *pwd, int clear_env) |
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148 { |
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149 if (chdir(pwd->pw_dir)) printf("bad home dir: %s\n", pwd->pw_dir); |
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150 |
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151 if (clear_env) { |
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152 const char * term = getenv("TERM"); |
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153 clearenv(); |
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154 if (term) setenv("TERM", term, 1); |
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155 } |
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156 |
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157 setenv("USER", pwd->pw_name, 1); |
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158 setenv("LOGNAME", pwd->pw_name, 1); |
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159 setenv("HOME", pwd->pw_dir, 1); |
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160 setenv("SHELL", pwd->pw_shell, 1); |
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161 } |
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162 |
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163 void login_main(void) |
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164 { |
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165 int f_flag = toys.optflags & FLAG_f; |
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166 int h_flag = toys.optflags & FLAG_h; |
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167 char username[USER_NAME_MAX_SIZE+1], *pass = NULL, **ss; |
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168 struct passwd * pwd = NULL; |
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169 struct spwd * spwd = NULL; |
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170 int auth_fail_cnt = 0; |
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171 |
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172 if (f_flag && toys.optc != 1) |
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173 error_exit("-f requires username"); |
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174 |
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175 if (geteuid()) error_exit("not root"); |
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176 |
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177 if (!isatty(0) || !isatty(1) || !isatty(2)) error_exit("no tty"); |
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178 |
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179 openlog("login", LOG_PID | LOG_CONS, LOG_AUTH); |
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180 signal(SIGALRM, login_timeout_handler); |
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181 alarm(LOGIN_TIMEOUT); |
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182 |
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183 for (ss = forbid; *ss; ss++) unsetenv(*ss); |
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184 |
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185 while (1) { |
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186 tcflush(0, TCIFLUSH); |
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187 |
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188 username[USER_NAME_MAX_SIZE] = 0; |
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189 if (toys.optargs[0]) |
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190 strncpy(username, toys.optargs[0], USER_NAME_MAX_SIZE); |
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191 else { |
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192 read_user(username, USER_NAME_MAX_SIZE+1); |
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193 if (username[0] == 0) continue; |
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194 } |
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195 |
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196 pwd = getpwnam(username); |
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197 if (!pwd) goto query_pass; // Non-existing user |
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198 |
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199 if (pwd->pw_passwd[0] == '!' || pwd->pw_passwd[0] == '*') |
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200 goto query_pass; // Locked account |
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201 |
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202 if (f_flag) break; // Pre-authenticated |
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203 |
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204 if (!pwd->pw_passwd[0]) break; // Password-less account |
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205 |
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206 pass = pwd->pw_passwd; |
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207 if (pwd->pw_passwd[0] == 'x') { |
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208 spwd = getspnam (username); |
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209 if (spwd) pass = spwd->sp_pwdp; |
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210 } |
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211 |
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212 query_pass: |
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213 if (!verify_password(pass)) break; |
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214 |
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215 f_flag = 0; |
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216 syslog(LOG_WARNING, "invalid password for '%s' on %s %s %s", username, |
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217 ttyname(0), h_flag?"from":"", h_flag?TT.hostname:""); |
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218 |
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219 sleep(LOGIN_FAIL_TIMEOUT); |
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220 puts("Login incorrect"); |
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221 |
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222 if (++auth_fail_cnt == 3) |
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223 error_exit("Maximum number of tries exceeded (%d)\n", auth_fail_cnt); |
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224 |
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225 username[0] = 0; |
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226 pwd = NULL; |
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227 spwd = NULL; |
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228 } |
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229 |
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230 alarm(0); |
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231 |
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232 if (pwd->pw_uid) handle_nologin(); |
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233 |
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234 if (change_identity(pwd)) error_exit("Failed to change identity"); |
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235 |
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236 setup_environment(pwd, !(toys.optflags & FLAG_p)); |
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237 |
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238 handle_motd(); |
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239 |
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240 syslog(LOG_INFO, "%s logged in on %s %s %s", pwd->pw_name, |
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New build infrastructure to generate FLAG_ macros and TT alias, #define FOR_commandname before #including toys.h to trigger it. Rename DEFINE_GLOBALS() to just GLOBALS() (because I could never remember if it was DECLARE_GLOBALS). Convert existing commands to use new infrastructure, and replace optflag constants with FLAG_ macros where appropriate.
Rob Landley <rob@landley.net>
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656
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241 ttyname(0), h_flag?"from":"", h_flag?TT.hostname:""); |
572
8a88a9e3c30b
Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
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242 |
8a88a9e3c30b
Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff
changeset
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243 spawn_shell(pwd->pw_shell); |
8a88a9e3c30b
Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
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changeset
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244 } |