annotate toys/lsb/passwd.c @ 1037:af1780148f7c draft

Implement ls --color=auto, suggested by Rich Felker.
author Rob Landley <rob@landley.net>
date Sun, 01 Sep 2013 08:00:41 -0500
parents c1a115650476
children 77235d224b1d
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1 /* passwd.c - Program to update user password.
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2 *
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3 * Copyright 2012 Ashwini Kumar <ak.ashwini@gmail.com>
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4 * Modified 2012 Jason Kyungwan Han <asura321@gmail.com>
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5 *
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6 * http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/passwd.html
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7
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8 USE_PASSWD(NEWTOY(passwd, ">1a:dlu", TOYFLAG_STAYROOT|TOYFLAG_USR|TOYFLAG_BIN))
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9
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10 config PASSWD
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11 bool "passwd"
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12 default y
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13 help
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14 usage: passwd [-a ALGO] [-d] [-l] [-u] <account name>
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16 update user’s authentication tokens. Default : current user
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18 -a ALGO Encryption method (des, md5, sha256, sha512) default: des
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19 -d Set password to ''
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20 -l Lock (disable) account
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21 -u Unlock (enable) account
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22 */
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23
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24 #define FOR_passwd
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25 #include "toys.h"
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26 #include <time.h>
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28 GLOBALS(
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29 char *algo;
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30 )
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32 #define MAX_SALT_LEN 20 //3 for id, 16 for key, 1 for '\0'
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33 #define URANDOM_PATH "/dev/urandom"
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35 #ifndef _GNU_SOURCE
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36 char *strcasestr(const char *haystack, const char *needle);
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37 #endif
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38
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39 unsigned int random_number_generator(int fd)
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40 {
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41 unsigned int randnum;
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43 xreadall(fd, &randnum, sizeof(randnum));
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44 return randnum;
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45 }
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47 char inttoc(int i)
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48 {
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49 // salt value uses 64 chracters in "./0-9a-zA-Z"
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50 const char character_set[]="./0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
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51
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52 i &= 0x3f; // masking for using 10 bits only
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53 return character_set[i];
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54 }
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55
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56 int get_salt(char *salt)
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57 {
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58 int i, salt_length = 0;
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59 int randfd;
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60
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61 if (!strncmp(TT.algo,"des",3)) {
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62 // 2 bytes salt value is used in des
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63 salt_length = 2;
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64 } else {
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65 *salt++ = '$';
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66 if (!strncmp(TT.algo,"md5",3)) {
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67 *salt++ = '1';
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68 // 8 bytes salt value is used in md5
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69 salt_length = 8;
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70 } else if (!strncmp(TT.algo,"sha256",6)) {
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71 *salt++ = '5';
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72 // 16 bytes salt value is used in sha256
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73 salt_length = 16;
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74 } else if (!strncmp(TT.algo,"sha512",6)) {
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75 *salt++ = '6';
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76 // 16 bytes salt value is used in sha512
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77 salt_length = 16;
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78 } else return 1;
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79
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80 *salt++ = '$';
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81 }
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82
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83 randfd = xopen(URANDOM_PATH, O_RDONLY);
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84 for (i=0; i<salt_length; i++)
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85 salt[i] = inttoc(random_number_generator(randfd));
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86 salt[salt_length+1] = '\0';
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87 xclose(randfd);
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88
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89 return 0;
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90 }
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91
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92 static int str_check(char *s, char *p)
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93 {
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94 if ((strcasestr(s, p) != NULL) || (strcasestr(p, s) != NULL)) return 1;
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95 return 0;
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96 }
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97
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98 static void strength_check(char *newp, char *oldp, char *user)
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99 {
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100 char *msg = NULL;
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101 if (strlen(newp) < 6) { //Min passwd len
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102 msg = "too short";
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103 xprintf("BAD PASSWORD: %s\n",msg);
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104 }
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105 if (!newp[0]) return; //passwd is empty
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106
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107 if (str_check(newp, user)) {
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108 msg = "user based password";
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109 xprintf("BAD PASSWORD: %s\n",msg);
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110 }
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111
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112 if (oldp[0] && str_check(newp, oldp)) {
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113 msg = "based on old passwd";
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114 xprintf("BAD PASSWORD: %s\n",msg);
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115 }
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116 }
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117
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118 static int verify_passwd(char * pwd)
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119 {
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120 char * pass;
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121
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122 if (!pwd) return 1;
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123 if (pwd[0] == '!' || pwd[0] == '*') return 1;
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124
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125 pass = crypt(toybuf, pwd);
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126 if (pass != NULL && strcmp(pass, pwd)==0) return 0;
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127
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128 return 1;
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129 }
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130
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131 static char *new_password(char *oldp, char *user)
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132 {
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133 char *newp = NULL;
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134
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135 if (read_password(toybuf, sizeof(toybuf), "New password:"))
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136 return NULL; //may be due to Ctrl-C
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137
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138 newp = xstrdup(toybuf);
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139 strength_check(newp, oldp, user);
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140 if (read_password(toybuf, sizeof(toybuf), "Retype password:")) {
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141 free(newp);
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142 return NULL; //may be due to Ctrl-C
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143 }
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144
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145 if (strcmp(newp, toybuf) == 0) return newp;
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146 else error_msg("Passwords do not match.\n");
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147 /*Failure Case */
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148 free(newp);
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149
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150 return NULL;
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151 }
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152
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153
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154 void passwd_main(void)
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155 {
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156 uid_t myuid;
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157 struct passwd *pw;
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158 struct spwd *sp;
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159 char *name = NULL;
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160 char *pass = NULL, *encrypted = NULL, *newp = NULL;
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161 char *orig = (char *)"";
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162 char salt[MAX_SALT_LEN];
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163 int ret = -1;
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164
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165 myuid = getuid();
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166 if ((myuid != 0) && (toys.optflags & (FLAG_l | FLAG_u | FLAG_d)))
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167 error_exit("You need to be root to do these actions\n");
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168
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169 pw = getpwuid(myuid);
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170
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171 if (!pw) error_exit("Unknown uid '%u'",myuid);
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172
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173 if (toys.optargs[0]) name = toys.optargs[0];
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174 else name = xstrdup(pw->pw_name);
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175
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176 pw = getpwnam(name);
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177 if (!pw) error_exit("Unknown user '%s'",name);
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178
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179 if (myuid != 0 && (myuid != pw->pw_uid))
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180 error_exit("You need to be root to change '%s' password\n", name);
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181
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182 pass = pw->pw_passwd;
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183 if (pw->pw_passwd[0] == 'x') {
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184 /*get shadow passwd */
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185 sp = getspnam(name);
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186 if (sp) pass = sp->sp_pwdp;
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187 }
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188
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189
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190 if (!(toys.optflags & (FLAG_l | FLAG_u | FLAG_d))) {
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191 printf("Changing password for %s\n",name);
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192 if (pass[0] == '!')
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193 error_exit("Can't change, password is locked for %s",name);
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194 if (myuid != 0) {
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195 /*Validate user */
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196
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197 if (read_password(toybuf, sizeof(toybuf), "Origial password:")) {
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198 if (!toys.optargs[0]) free(name);
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199 return;
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200 }
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201 orig = toybuf;
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202 if (verify_passwd(pass)) error_exit("Authentication failed\n");
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203 }
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204
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205 orig = xstrdup(orig);
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206
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207 /*Get new password */
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208 newp = new_password(orig, name);
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209 if (!newp) {
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210 free(orig);
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211 if (!toys.optargs[0]) free(name);
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212 return; //new password is not set well.
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213 }
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214
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215 /*Encrypt the passwd */
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216 if (!(toys.optflags & FLAG_a)) TT.algo = "des";
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217
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218 if (get_salt(salt)) error_exit("Error: Unkown encryption algorithm\n");
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219
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220 encrypted = crypt(newp, salt);
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221 free(newp);
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222 free(orig);
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223 } else if (toys.optflags & FLAG_l) {
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224 if (pass[0] == '!')
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225 error_exit("password is already locked for %s",name);
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226 printf("Locking password for %s\n",name);
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227 encrypted = xmsprintf("!%s",pass);
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228 } else if (toys.optflags & FLAG_u) {
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229 if (pass[0] != '!')
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230 error_exit("password is already unlocked for %s",name);
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231
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232 printf("Unlocking password for %s\n",name);
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233 encrypted = xstrdup(&pass[1]);
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234 } else if (toys.optflags & FLAG_d) {
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235 printf("Deleting password for %s\n",name);
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236 encrypted = (char*)xzalloc(sizeof(char)*2); //1 = "", 2 = '\0'
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237 }
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238
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239 /*Update the passwd */
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240 if (pw->pw_passwd[0] == 'x')
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241 ret = update_password("/etc/shadow", name, encrypted);
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242 else ret = update_password("/etc/passwd", name, encrypted);
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243
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244 if ((toys.optflags & (FLAG_l | FLAG_u | FLAG_d))) free(encrypted);
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245
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246 if (!toys.optargs[0]) free(name);
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247 if (!ret) error_msg("Success");
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248 else error_msg("Failure");
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249 }