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annotate toys/login.c @ 572:8a88a9e3c30b

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Adding initial version of login.c
author Elie De Brauwer <eliedebrauwer@gmail.com>
date Tue, 24 Apr 2012 23:09:27 +0200
parents
children 98bde84a888c
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rev   line source
572
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
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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 const 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 // Unset dangerous environment variables.
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61 void sanitize_env()
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62 {
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63 const char **p = forbid;
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64 do {
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65 unsetenv(*p);
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66 p++;
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67 } while (*p);
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68 }
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69
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70 int read_password(char * buff, int buflen)
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71 {
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72 int i = 0;
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73 struct termios termio, oldtermio;
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74 tcgetattr(0, &oldtermio);
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75 tcflush(0, TCIFLUSH);
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76 termio = oldtermio;
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77
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78 termio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
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79 termio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP);
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80 tcsetattr(0, TCSANOW, &termio);
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81
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82 fputs("Password: ", stdout);
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83 fflush(stdout);
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84
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85 while (1) {
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86 int ret = read(0, &buff[i], 1);
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87 if ( ret < 0 )
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88 {
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89 buff[0] = 0;
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90 tcsetattr(0, TCSANOW, &oldtermio);
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91 return 1;
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92 }
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93 else if ( ret == 0 || buff[i] == '\n' ||
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94 buff[i] == '\r' || buflen == i+1)
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95 {
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96 buff[i] = '\0';
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97 break;
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98 }
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99 i++;
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100 }
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101
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102 tcsetattr(0, TCSANOW, &oldtermio);
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103 puts("\n");
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104 fflush(stdout);
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105 return 0;
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106 }
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107
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108 int verify_password(char * pwd)
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109 {
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110 char * pass;
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111
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112 if (read_password(toybuf, sizeof(toybuf)))
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113 return 1;
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114 if (!pwd)
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115 return 1;
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116 if (pwd[0] == '!' || pwd[0] == '*')
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117 return 1;
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118
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119 pass = crypt(toybuf, pwd);
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120 if (pass != NULL && strcmp(pass, pwd)==0)
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121 return 0;
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122
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123 return 1;
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124 }
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125
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126 void read_user(char * buff, int size)
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127 {
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128 char hostname[HOSTNAME_SIZE+1];
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129 int i = 0;
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130 hostname[HOSTNAME_SIZE] = 0;
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131 if(!gethostname(hostname, HOSTNAME_SIZE))
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132 fputs(hostname, stdout);
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133
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134 fputs(" login: ", stdout);
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135 fflush(stdout);
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136
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137 do {
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138 buff[0] = getchar();
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139 if (buff[0] == EOF)
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140 exit(EXIT_FAILURE);
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141 } while (isblank(buff[0]));
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142
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143 if (buff[0] != '\n')
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
144 if(!fgets(&buff[1], HOSTNAME_SIZE-1, stdin))
8a88a9e3c30b Adding initial version of login.c
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parents:
diff changeset
145 _exit(1);
8a88a9e3c30b Adding initial version of login.c
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parents:
diff changeset
146
8a88a9e3c30b Adding initial version of login.c
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parents:
diff changeset
147 while(i<HOSTNAME_SIZE-1 && isgraph(buff[i]))
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parents:
diff changeset
148 {
8a88a9e3c30b Adding initial version of login.c
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parents:
diff changeset
149 i++;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
150 }
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
151 buff[i] = 0;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
152 }
8a88a9e3c30b Adding initial version of login.c
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parents:
diff changeset
153
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Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
154 void handle_nologin(void)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
155 {
8a88a9e3c30b Adding initial version of login.c
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parents:
diff changeset
156 int fd = open("/etc/nologin", O_RDONLY);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
157 int size;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
158 if (fd == -1)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
159 return;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
160
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
161 size = readall(fd, toybuf,sizeof(toybuf)-1);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
162 toybuf[size] = 0;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
163 if (!size)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
164 puts("System closed for routine maintenance\n");
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
165 else
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
166 puts(toybuf);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
167
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parents:
diff changeset
168 close(fd);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
169 fflush(stdout);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
170 exit(EXIT_FAILURE);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
171 }
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
172
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Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
173 void handle_motd(void)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
174 {
8a88a9e3c30b Adding initial version of login.c
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parents:
diff changeset
175 int fd = open("/etc/motd", O_RDONLY);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
176 int size;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
177 if (fd == -1)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
178 return;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
179
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parents:
diff changeset
180 size = readall(fd, toybuf,sizeof(toybuf)-1);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
181 toybuf[size] = 0;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
182 puts(toybuf);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
183
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parents:
diff changeset
184 close(fd);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
185 fflush(stdout);
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Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
186 }
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Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
187
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Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
188 int change_identity(const struct passwd *pwd)
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Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
189 {
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
190 if (initgroups(pwd->pw_name,pwd->pw_gid))
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
191 return 1;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
192 if (setgid(pwd->pw_uid))
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
193 return 1;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
194 if (setuid(pwd->pw_uid))
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
195 return 1;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
196
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parents:
diff changeset
197 return 0;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
198 }
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
199
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
200 void spawn_shell(const char *shell)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
201 {
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
202 const char * exec_name = strrchr(shell,'/');
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
203 if (exec_name)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
204 exec_name++;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
205 else
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
206 exec_name = shell;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
207
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
208 snprintf(toybuf,sizeof(toybuf)-1, "-%s", shell);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
209 execl(shell, toybuf, NULL);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
210 error_exit("Failed to spawn shell");
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
211 }
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
212
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
213 void setup_environment(const struct passwd *pwd, int clear_env)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
214 {
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
215 if (chdir(pwd->pw_dir))
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
216 printf("can't chdir to home directory: %s\n", pwd->pw_dir);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
217
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
218 if (clear_env)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
219 {
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
220 const char * term = getenv("TERM");
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
221 clearenv();
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
222 if (term) setenv("TERM", term, 1);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
223 }
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
224
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
225 setenv("USER", pwd->pw_name, 1);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
226 setenv("LOGNAME", pwd->pw_name, 1);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
227 setenv("HOME", pwd->pw_dir, 1);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
228 setenv("SHELL", pwd->pw_shell, 1);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
229 }
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
230
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
231 void login_main(void)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
232 {
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
233 int f_flag = (toys.optflags & 4) >> 2;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
234 int p_flag = (toys.optflags & 2) >> 1;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
235 int h_flag = toys.optflags & 1;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
236 char username[USER_NAME_MAX_SIZE+1];
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
237 struct passwd * pwd = NULL;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
238 struct spwd * spwd = NULL;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
239 char *pass = NULL;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
240 int auth_fail_cnt = 0;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
241
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
242 if (f_flag && toys.optc != 1)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
243 error_exit("-f requires username");
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
244
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
245 if (geteuid() != 0 )
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
246 error_exit("Cannot possibly work without effective root");
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
247
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
248 if (!isatty(0) || !isatty(1) || !isatty(2))
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
249 error_exit("Not connected to a tty");
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
250
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
251 openlog("login", LOG_PID | LOG_CONS, LOG_AUTH);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
252 signal(SIGALRM, login_timeout_handler);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
253 alarm(LOGIN_TIMEOUT);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
254 sanitize_env();
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
255
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
256 while (1) {
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
257 tcflush(0, TCIFLUSH);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
258
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
259 username[USER_NAME_MAX_SIZE] = 0;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
260 if (toys.optargs[0])
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
261 strncpy(username, toys.optargs[0], USER_NAME_MAX_SIZE);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
262 else {
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
263 read_user(username, USER_NAME_MAX_SIZE+1);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
264 if (username[0] == 0)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
265 continue;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
266 }
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
267
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
268 pwd = getpwnam(username);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
269 if (!pwd)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
270 goto query_pass; // Non-existing user
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
271
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
272 if (pwd->pw_passwd[0] == '!' || pwd->pw_passwd[0] == '*')
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
273 goto query_pass; // Locked account
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
274
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
275 if (f_flag)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
276 break; // Pre-authenticated
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
277
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
278 if (pwd->pw_passwd[0] == '\0')
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
279 break; // Password-less account
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
280
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
281 pass = pwd->pw_passwd;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
282 if (pwd->pw_passwd[0] == 'x') {
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
283 spwd = getspnam (username);
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
284 if (spwd)
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
285 pass = spwd->sp_pwdp;
8a88a9e3c30b Adding initial version of login.c
Elie De Brauwer <eliedebrauwer@gmail.com>
parents:
diff changeset
286 }
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287
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288 query_pass:
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289 if (!verify_password(pass))
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290 break;
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291
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292 f_flag = 0;
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293 syslog(LOG_WARNING, "invalid password for '%s' on %s %s %s", username,
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294 ttyname(0),
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295 (h_flag)?"from":"",
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296 (h_flag)?TT.hostname:"");
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297
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298 sleep(LOGIN_FAIL_TIMEOUT);
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299 puts("Login incorrect");
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300
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301 if (++auth_fail_cnt == 3)
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302 {
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303 error_exit("Maximum number of tries exceeded (%d)\n", auth_fail_cnt);
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304 }
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305
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306 username[0] = 0;
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307 pwd = NULL;
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308 spwd = NULL;
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309 }
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310
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311 alarm(0);
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312
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313 if (pwd->pw_uid)
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314 handle_nologin();
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315
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316 if (change_identity(pwd))
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317 error_exit("Failed to change identity");
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318
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319 setup_environment(pwd, !p_flag);
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320
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321 handle_motd();
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322
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323 syslog(LOG_INFO, "%s logged in on %s %s %s", pwd->pw_name,
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324 ttyname(0),
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325 (h_flag)?"from":"",
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326 (h_flag)?TT.hostname:"");
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327
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328 spawn_shell(pwd->pw_shell);
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329 }