Mercurial > hg > toybox
annotate toys/login.c @ 642:812afb883392
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author | Rob Landley <rob@landley.net> |
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date | Tue, 24 Jul 2012 02:52:36 -0500 |
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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 * Not in SUSv4. |
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8 * No support for PAM/securetty/selinux/login script/issue/utmp |
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9 * Relies on libcrypt for hash calculation. |
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10 |
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11 USE_LOGIN(NEWTOY(login, ">1fph:", TOYFLAG_BIN)) |
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12 |
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13 config LOGIN |
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14 bool "login" |
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15 default y |
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16 help |
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17 usage: login [-p] [-h host] [[-f] username] |
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18 |
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19 Establish a new session with the system. |
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20 -p Preserve environment |
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21 -h The name of the remote host for this login |
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22 -f Do not perform authentication |
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23 */ |
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24 |
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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 DEFINE_GLOBALS( |
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33 char *hostname; |
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34 ) |
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35 #define TT this.login |
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36 |
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37 static void login_timeout_handler(int sig __attribute__((unused))) |
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38 { |
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39 printf("\nLogin timed out after %d seconds.\n", LOGIN_TIMEOUT); |
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40 exit(0); |
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41 } |
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42 |
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43 static char *forbid[] = { |
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44 "BASH_ENV", |
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45 "ENV", |
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46 "HOME", |
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47 "IFS", |
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48 "LD_LIBRARY_PATH", |
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49 "LD_PRELOAD", |
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50 "LD_TRACE_LOADED_OBJECTS", |
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51 "LD_BIND_NOW", |
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52 "LD_AOUT_LIBRARY_PATH", |
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53 "LD_AOUT_PRELOAD", |
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54 "LD_NOWARN", |
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55 "LD_KEEPDIR", |
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56 "SHELL", |
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57 NULL |
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58 }; |
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59 |
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60 int verify_password(char * pwd) |
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61 { |
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62 char *pass; |
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63 |
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64 if (read_password(toybuf, sizeof(toybuf), "Password: ")) return 1; |
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65 if (!pwd) return 1; |
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66 if (pwd[0] == '!' || pwd[0] == '*') return 1; |
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67 |
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68 pass = crypt(toybuf, pwd); |
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69 if (pass && !strcmp(pass, pwd)) return 0; |
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70 |
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71 return 1; |
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72 } |
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73 |
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74 void read_user(char * buff, int size) |
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75 { |
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76 char hostname[HOSTNAME_SIZE+1]; |
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77 int i = 0; |
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78 hostname[HOSTNAME_SIZE] = 0; |
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79 if(!gethostname(hostname, HOSTNAME_SIZE)) fputs(hostname, stdout); |
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80 |
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81 fputs(" login: ", stdout); |
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82 fflush(stdout); |
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83 |
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84 do { |
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85 buff[0] = getchar(); |
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86 if (buff[0] == EOF) |
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87 exit(EXIT_FAILURE); |
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88 } while (isblank(buff[0])); |
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89 |
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90 if (buff[0] != '\n') |
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91 if(!fgets(&buff[1], HOSTNAME_SIZE-1, stdin)) |
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92 _exit(1); |
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93 |
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94 while(i<HOSTNAME_SIZE-1 && isgraph(buff[i])) i++; |
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95 buff[i] = 0; |
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96 } |
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97 |
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98 void handle_nologin(void) |
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99 { |
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100 int fd = open("/etc/nologin", O_RDONLY); |
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101 int size; |
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102 if (fd == -1) return; |
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103 |
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104 size = readall(fd, toybuf,sizeof(toybuf)-1); |
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105 toybuf[size] = 0; |
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106 if (!size) puts("System closed for routine maintenance\n"); |
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107 else puts(toybuf); |
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108 |
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109 close(fd); |
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110 fflush(stdout); |
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111 exit(EXIT_FAILURE); |
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112 } |
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113 |
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114 void handle_motd(void) |
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115 { |
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116 int fd = open("/etc/motd", O_RDONLY); |
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117 int size; |
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118 if (fd == -1) return; |
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119 |
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120 size = readall(fd, toybuf,sizeof(toybuf)-1); |
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121 toybuf[size] = 0; |
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122 puts(toybuf); |
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123 |
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124 close(fd); |
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125 fflush(stdout); |
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126 } |
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127 |
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128 int change_identity(const struct passwd *pwd) |
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129 { |
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130 if (initgroups(pwd->pw_name,pwd->pw_gid)) return 1; |
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131 if (setgid(pwd->pw_uid)) return 1; |
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132 if (setuid(pwd->pw_uid)) return 1; |
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133 |
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134 return 0; |
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135 } |
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136 |
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137 void spawn_shell(const char *shell) |
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138 { |
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139 const char * exec_name = strrchr(shell,'/'); |
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140 if (exec_name) exec_name++; |
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141 else exec_name = shell; |
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142 |
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143 snprintf(toybuf,sizeof(toybuf)-1, "-%s", shell); |
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144 execl(shell, toybuf, NULL); |
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145 error_exit("Failed to spawn shell"); |
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146 } |
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147 |
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148 void setup_environment(const struct passwd *pwd, int clear_env) |
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149 { |
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150 if (chdir(pwd->pw_dir)) printf("bad home dir: %s\n", pwd->pw_dir); |
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151 |
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152 if (clear_env) { |
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153 const char * term = getenv("TERM"); |
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154 clearenv(); |
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155 if (term) setenv("TERM", term, 1); |
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156 } |
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157 |
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158 setenv("USER", pwd->pw_name, 1); |
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159 setenv("LOGNAME", pwd->pw_name, 1); |
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160 setenv("HOME", pwd->pw_dir, 1); |
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161 setenv("SHELL", pwd->pw_shell, 1); |
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162 } |
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163 |
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164 void login_main(void) |
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165 { |
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166 int f_flag = (toys.optflags & 4) >> 2; |
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167 int p_flag = (toys.optflags & 2) >> 1; |
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168 int h_flag = toys.optflags & 1; |
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169 char username[USER_NAME_MAX_SIZE+1], *pass = NULL, **ss; |
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170 struct passwd * pwd = NULL; |
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171 struct spwd * spwd = NULL; |
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172 int auth_fail_cnt = 0; |
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173 |
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174 if (f_flag && toys.optc != 1) |
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175 error_exit("-f requires username"); |
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176 |
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177 if (geteuid()) error_exit("not root"); |
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178 |
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179 if (!isatty(0) || !isatty(1) || !isatty(2)) error_exit("no tty"); |
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180 |
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181 openlog("login", LOG_PID | LOG_CONS, LOG_AUTH); |
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182 signal(SIGALRM, login_timeout_handler); |
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183 alarm(LOGIN_TIMEOUT); |
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184 |
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185 for (ss = forbid; *ss; ss++) unsetenv(*ss); |
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186 |
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187 while (1) { |
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188 tcflush(0, TCIFLUSH); |
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189 |
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190 username[USER_NAME_MAX_SIZE] = 0; |
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191 if (toys.optargs[0]) |
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192 strncpy(username, toys.optargs[0], USER_NAME_MAX_SIZE); |
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193 else { |
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194 read_user(username, USER_NAME_MAX_SIZE+1); |
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195 if (username[0] == 0) continue; |
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196 } |
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197 |
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198 pwd = getpwnam(username); |
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199 if (!pwd) goto query_pass; // Non-existing user |
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200 |
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201 if (pwd->pw_passwd[0] == '!' || pwd->pw_passwd[0] == '*') |
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202 goto query_pass; // Locked account |
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203 |
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204 if (f_flag) break; // Pre-authenticated |
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205 |
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206 if (!pwd->pw_passwd[0]) break; // Password-less account |
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207 |
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208 pass = pwd->pw_passwd; |
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209 if (pwd->pw_passwd[0] == 'x') { |
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210 spwd = getspnam (username); |
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211 if (spwd) pass = spwd->sp_pwdp; |
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212 } |
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213 |
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214 query_pass: |
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215 if (!verify_password(pass)) break; |
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216 |
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217 f_flag = 0; |
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218 syslog(LOG_WARNING, "invalid password for '%s' on %s %s %s", username, |
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219 ttyname(0), (h_flag)?"from":"", (h_flag)?TT.hostname:""); |
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220 |
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221 sleep(LOGIN_FAIL_TIMEOUT); |
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222 puts("Login incorrect"); |
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223 |
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224 if (++auth_fail_cnt == 3) |
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225 error_exit("Maximum number of tries exceeded (%d)\n", auth_fail_cnt); |
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226 |
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227 username[0] = 0; |
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228 pwd = NULL; |
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229 spwd = NULL; |
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230 } |
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231 |
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232 alarm(0); |
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233 |
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234 if (pwd->pw_uid) handle_nologin(); |
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235 |
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236 if (change_identity(pwd)) error_exit("Failed to change identity"); |
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237 |
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238 setup_environment(pwd, !p_flag); |
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239 |
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240 handle_motd(); |
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241 |
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242 syslog(LOG_INFO, "%s logged in on %s %s %s", pwd->pw_name, |
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243 ttyname(0), (h_flag)?"from":"", (h_flag)?TT.hostname:""); |
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244 |
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245 spawn_shell(pwd->pw_shell); |
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246 } |