Mercurial > hg > toybox
annotate lib/password.c @ 1303:2b89b13df19e draft
Update docs for example and pending directories.
author | Rob Landley <rob@landley.net> |
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date | Thu, 22 May 2014 08:16:55 -0500 |
parents | 63db77909fc8 |
children | 1493a21160a4 |
rev | line source |
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1 /* password.c - password read/update helper functions. |
626 | 2 * |
3 * Copyright 2012 Ashwini Kumar <ak.ashwini@gmail.com> | |
4 */ | |
5 | |
6 #include "toys.h" | |
7 #include <time.h> | |
8 | |
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9 int get_salt(char *salt, char *algo) |
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10 { |
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11 int i, len = 0, offset = 0; |
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12 char buf[12]; |
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13 |
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14 if (!strcmp(algo,"des")) len = 2; |
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15 else { |
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16 *salt++ = '$'; |
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17 if (!strcmp(algo,"md5")) { |
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18 *salt++ = '1'; |
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19 len = 8; |
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20 } else if (!strcmp(algo,"sha256")) { |
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21 *salt++ = '5'; |
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22 len = 16; |
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23 } else if (!strcmp(algo,"sha512")) { |
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24 *salt++ = '6'; |
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25 len = 16; |
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26 } else return -1; |
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27 |
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28 *salt++ = '$'; |
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29 offset = 3; |
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30 } |
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31 |
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32 // Read appropriate number of random bytes for salt |
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33 i = xopen("/dev/urandom", O_RDONLY); |
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34 xreadall(i, buf, ((len*6)+7)/8); |
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35 close(i); |
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36 |
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37 // Grab 6 bit chunks and convert to characters in ./0-9a-zA-Z |
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38 for (i=0; i<len; i++) { |
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39 int bitpos = i*6, bits = bitpos/8; |
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40 |
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41 bits = ((buf[i]+(buf[i+1]<<8)) >> (bitpos&7)) & 0x3f; |
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42 bits += 46; |
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43 if (bits > 57) bits += 7; |
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44 if (bits > 90) bits += 6; |
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45 |
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46 salt[i] = bits; |
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47 } |
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48 salt[i] = 0; |
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49 |
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50 return offset; |
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51 } |
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52 |
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53 static void handle(int signo) |
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54 { |
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55 //Dummy.. so that read breaks on the signal, |
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56 //instead of the applocation exit |
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57 } |
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58 |
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59 int read_password(char * buff, int buflen, char* mesg) |
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60 { |
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61 int i = 0; |
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62 struct termios termio, oldtermio; |
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63 struct sigaction sa, oldsa; |
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64 |
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65 tcgetattr(0, &oldtermio); |
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66 tcflush(0, TCIFLUSH); |
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67 termio = oldtermio; |
626 | 68 |
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69 memset(&sa, 0, sizeof(sa)); |
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70 sa.sa_handler = handle; |
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71 sigaction(SIGINT, &sa, &oldsa); |
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72 |
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73 termio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY); |
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74 termio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP); |
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75 tcsetattr(0, TCSANOW, &termio); |
626 | 76 |
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77 fputs(mesg, stdout); |
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78 fflush(stdout); |
626 | 79 |
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80 while (1) { |
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81 int ret = read(0, &buff[i], 1); |
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82 if ( ret < 0 ) { |
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83 buff[0] = 0; |
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84 sigaction(SIGINT, &oldsa, NULL); |
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85 tcsetattr(0, TCSANOW, &oldtermio); |
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86 xputc('\n'); |
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87 fflush(stdout); |
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88 return 1; |
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89 } else if (ret == 0 || buff[i] == '\n' || buff[i] == '\r' || buflen == i+1) |
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90 { |
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91 buff[i] = '\0'; |
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92 break; |
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93 } |
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94 i++; |
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95 } |
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96 sigaction(SIGINT, &oldsa, NULL); |
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97 tcsetattr(0, TCSANOW, &oldtermio); |
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98 puts(""); |
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99 fflush(stdout); |
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100 return 0; |
626 | 101 } |
102 | |
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103 static char *get_nextcolon(char *line, int cnt) |
626 | 104 { |
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105 while (cnt--) { |
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106 if (!(line = strchr(line, ':'))) error_exit("Invalid Entry\n"); |
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107 line++; //jump past the colon |
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108 } |
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109 return line; |
626 | 110 } |
111 | |
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112 /*update_password is used by multiple utilities to update /etc/passwd, |
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113 * /etc/shadow, /etc/group and /etc/gshadow files, |
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114 * which are used as user, group databeses |
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115 * entry can be |
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116 * 1. encrypted password, when updating user password. |
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117 * 2. complete entry for user details, when creating new user |
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118 * 3. group members comma',' separated list, when adding user to group |
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119 * 4. complete entry for group details, when creating new group |
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120 * 5. entry = NULL, delete the named entry user/group |
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121 */ |
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122 int update_password(char *filename, char* username, char* entry) |
626 | 123 { |
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124 char *filenamesfx = NULL, *namesfx = NULL, *shadow = NULL, |
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125 *sfx = NULL, *line = NULL; |
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126 FILE *exfp, *newfp; |
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127 int ret = -1, found = 0; |
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128 struct flock lock; |
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129 |
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130 shadow = strstr(filename, "shadow"); |
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131 filenamesfx = xmprintf("%s+", filename); |
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132 sfx = strchr(filenamesfx, '+'); |
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133 |
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134 exfp = fopen(filename, "r+"); |
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135 if (!exfp) { |
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136 perror_msg("Couldn't open file %s",filename); |
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137 goto free_storage; |
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138 } |
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139 |
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140 *sfx = '-'; |
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141 ret = unlink(filenamesfx); |
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142 ret = link(filename, filenamesfx); |
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143 if (ret < 0) error_msg("can't create backup file"); |
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144 |
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145 *sfx = '+'; |
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146 lock.l_type = F_WRLCK; |
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147 lock.l_whence = SEEK_SET; |
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148 lock.l_start = 0; |
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149 lock.l_len = 0; |
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150 |
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151 ret = fcntl(fileno(exfp), F_SETLK, &lock); |
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152 if (ret < 0) perror_msg("Couldn't lock file %s",filename); |
626 | 153 |
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154 lock.l_type = F_UNLCK; //unlocking at a later stage |
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155 |
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156 newfp = fopen(filenamesfx, "w+"); |
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157 if (!newfp) { |
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158 error_msg("couldn't open file for writing"); |
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159 ret = -1; |
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160 fclose(exfp); |
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161 goto free_storage; |
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162 } |
626 | 163 |
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164 ret = 0; |
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165 namesfx = xmprintf("%s:",username); |
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166 while ((line = get_line(fileno(exfp))) != NULL) |
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167 { |
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168 if (strncmp(line, namesfx, strlen(namesfx))) |
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169 fprintf(newfp, "%s\n", line); |
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170 else if (entry) { |
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171 char *current_ptr = NULL; |
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172 |
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173 found = 1; |
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174 if (!strcmp(toys.which->name, "passwd")) { |
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175 fprintf(newfp, "%s%s:",namesfx, entry); |
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176 current_ptr = get_nextcolon(line, 2); //past passwd |
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177 if (shadow) { |
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178 fprintf(newfp, "%u:",(unsigned)(time(NULL))/(24*60*60)); |
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179 current_ptr = get_nextcolon(current_ptr, 1); |
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180 fprintf(newfp, "%s\n",current_ptr); |
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181 } else fprintf(newfp, "%s\n",current_ptr); |
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182 } else if (!strcmp(toys.which->name, "groupadd") || |
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183 !strcmp(toys.which->name, "addgroup") || |
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184 !strcmp(toys.which->name, "delgroup") || |
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185 !strcmp(toys.which->name, "groupdel")){ |
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186 current_ptr = get_nextcolon(line, 3); //past gid/admin list |
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187 *current_ptr = '\0'; |
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188 fprintf(newfp, "%s", line); |
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189 fprintf(newfp, "%s\n", entry); |
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190 } |
626 | 191 } |
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192 free(line); |
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193 } |
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194 free(namesfx); |
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195 if (!found && entry) fprintf(newfp, "%s\n", entry); |
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196 fcntl(fileno(exfp), F_SETLK, &lock); |
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197 fclose(exfp); |
626 | 198 |
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199 errno = 0; |
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200 fflush(newfp); |
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201 fsync(fileno(newfp)); |
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202 fclose(newfp); |
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203 rename(filenamesfx, filename); |
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204 if (errno) { |
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205 perror_msg("File Writing/Saving failed: "); |
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206 unlink(filenamesfx); |
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207 ret = -1; |
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208 } |
626 | 209 |
210 free_storage: | |
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211 free(filenamesfx); |
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212 return ret; |
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213 } |
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214 |
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215 void is_valid_username(const char *name) |
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216 { |
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217 regex_t rp; |
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218 regmatch_t rm[1]; |
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219 int eval; |
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220 char *regex = "^[_.A-Za-z0-9][-_.A-Za-z0-9]*"; //User name REGEX |
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221 |
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222 xregcomp(&rp, regex, REG_NEWLINE); |
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223 |
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224 /* compare string against pattern -- remember that patterns |
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225 are anchored to the beginning of the line */ |
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226 eval = regexec(&rp, name, 1, rm, 0); |
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227 regfree(&rp); |
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228 if (!eval && !rm[0].rm_so) { |
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229 int len = strlen(name); |
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230 if ((rm[0].rm_eo == len) || |
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231 (rm[0].rm_eo == len - 1 && name[len - 1] == '$')) { |
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232 if (len >= LOGIN_NAME_MAX) error_exit("name is too long"); |
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233 else return; |
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234 } |
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235 } |
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236 error_exit("'%s', not valid %sname",name, |
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237 (((toys.which->name[3] == 'g') || |
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238 (toys.which->name[0] == 'g'))? "group" : "user")); |
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239 } |