Mercurial > hg > toybox
annotate toys/lsb/passwd.c @ 1037:af1780148f7c draft
Implement ls --color=auto, suggested by Rich Felker.
author | Rob Landley <rob@landley.net> |
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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. |
626 | 2 * |
3 * Copyright 2012 Ashwini Kumar <ak.ashwini@gmail.com> | |
4 * Modified 2012 Jason Kyungwan Han <asura321@gmail.com> | |
5 * | |
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6 * http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/passwd.html |
626 | 7 |
8 USE_PASSWD(NEWTOY(passwd, ">1a:dlu", TOYFLAG_STAYROOT|TOYFLAG_USR|TOYFLAG_BIN)) | |
9 | |
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> |
626 | 15 |
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16 update user’s authentication tokens. Default : current user |
626 | 17 |
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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 |
626 | 22 */ |
23 | |
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24 #define FOR_passwd |
626 | 25 #include "toys.h" |
26 #include <time.h> | |
27 | |
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28 GLOBALS( |
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29 char *algo; |
626 | 30 ) |
31 | |
32 #define MAX_SALT_LEN 20 //3 for id, 16 for key, 1 for '\0' | |
33 #define URANDOM_PATH "/dev/urandom" | |
34 | |
35 #ifndef _GNU_SOURCE | |
36 char *strcasestr(const char *haystack, const char *needle); | |
37 #endif | |
38 | |
39 unsigned int random_number_generator(int fd) | |
40 { | |
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41 unsigned int randnum; |
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42 |
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43 xreadall(fd, &randnum, sizeof(randnum)); |
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44 return randnum; |
626 | 45 } |
46 | |
47 char inttoc(int i) | |
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]; |
626 | 54 } |
55 | |
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++ = '$'; |
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66 if (!strncmp(TT.algo,"md5",3)) { |
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67 *salt++ = '1'; |
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68 // 8 bytes salt value is used in md5 |
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69 salt_length = 8; |
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70 } else if (!strncmp(TT.algo,"sha256",6)) { |
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71 *salt++ = '5'; |
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72 // 16 bytes salt value is used in sha256 |
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73 salt_length = 16; |
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74 } else if (!strncmp(TT.algo,"sha512",6)) { |
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75 *salt++ = '6'; |
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76 // 16 bytes salt value is used in sha512 |
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77 salt_length = 16; |
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78 } else return 1; |
626 | 79 |
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80 *salt++ = '$'; |
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81 } |
626 | 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); |
626 | 88 |
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89 return 0; |
626 | 90 } |
91 | |
92 static int str_check(char *s, char *p) | |
93 { | |
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94 if ((strcasestr(s, p) != NULL) || (strcasestr(p, s) != NULL)) return 1; |
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95 return 0; |
626 | 96 } |
97 | |
98 static void strength_check(char *newp, char *oldp, char *user) | |
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 |
626 | 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 } |
626 | 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 } |
626 | 116 } |
117 | |
118 static int verify_passwd(char * pwd) | |
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119 { |
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120 char * pass; |
626 | 121 |
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122 if (!pwd) return 1; |
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123 if (pwd[0] == '!' || pwd[0] == '*') return 1; |
626 | 124 |
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125 pass = crypt(toybuf, pwd); |
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126 if (pass != NULL && strcmp(pass, pwd)==0) return 0; |
626 | 127 |
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128 return 1; |
626 | 129 } |
130 | |
131 static char *new_password(char *oldp, char *user) | |
132 { | |
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133 char *newp = NULL; |
626 | 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 |
626 | 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 } |
626 | 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; |
626 | 151 } |
152 | |
153 | |
154 void passwd_main(void) | |
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; |
626 | 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"); |
626 | 168 |
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169 pw = getpwuid(myuid); |
626 | 170 |
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171 if (!pw) error_exit("Unknown uid '%u'",myuid); |
626 | 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); |
626 | 175 |
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176 pw = getpwnam(name); |
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177 if (!pw) error_exit("Unknown user '%s'",name); |
626 | 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); |
626 | 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 } |
626 | 188 |
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 */ |
626 | 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"); |
626 | 203 } |
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204 |
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205 orig = xstrdup(orig); |
626 | 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. |
626 | 213 } |
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); |
626 | 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 } |
626 | 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"); |
626 | 249 } |