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626
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1 /* vi: set sw=4 ts=4 :
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2 * pwdutils.c - password read/update helper functions.
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3 *
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4 * Copyright 2012 Ashwini Kumar <ak.ashwini@gmail.com>
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5 */
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6
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7 #include "toys.h"
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8 #include <time.h>
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9
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10
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11 int read_passwd(char * buff, int buflen, char* mesg)
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12 {
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13 int i = 0;
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14 struct termios termio, oldtermio;
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15 tcgetattr(0, &oldtermio);
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16 tcflush(0, TCIFLUSH);
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17 termio = oldtermio;
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18
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19 termio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
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20 termio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP);
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21 tcsetattr(0, TCSANOW, &termio);
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22
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23 fputs(mesg, stdout);
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24 fflush(stdout);
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25
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26 while (1) {
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27 int ret = read(0, &buff[i], 1);
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28 if ( ret < 0 ) {
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29 buff[0] = 0;
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30 tcsetattr(0, TCSANOW, &oldtermio);
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31 return 1;
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32 }
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33 else if ( ret == 0 || buff[i] == '\n' ||
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34 buff[i] == '\r' || buflen == i+1) {
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35 buff[i] = '\0';
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36 break;
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37 }
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38 i++;
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39 }
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40
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41 tcsetattr(0, TCSANOW, &oldtermio);
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42 puts("");
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43 fflush(stdout);
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44 return 0;
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45 }
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46
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47 static char *get_nextcolon(const char *line, char delim)
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48 {
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49 char *current_ptr = NULL;
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50 if((current_ptr = strchr(line, ':')) == NULL)
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51 error_exit("Invalid Entry\n");
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52 return current_ptr;
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53 }
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54
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55 int update_passwd(char *filename, char* username, char* encrypted)
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56 {
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57 char *filenamesfx = NULL, *namesfx = NULL;
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58 char *shadow = NULL, *sfx = NULL;
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59 FILE *exfp, *newfp;
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60 int ret = -1; //fail
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61 struct flock lock;
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62 char *line = NULL;
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63
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64 shadow = strstr(filename, "shadow");
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65 filenamesfx = xmsprintf("%s+", filename);
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66 sfx = strchr(filenamesfx, '+');
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67
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68 exfp = fopen(filename, "r+");
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69 if(!exfp) {
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70 perror_msg("Couldn't open file %s",filename);
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71 goto free_storage;
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72 }
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73
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74 *sfx = '-';
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75 ret = unlink(filenamesfx);
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76 ret = link(filename, filenamesfx);
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77 if(ret < 0) error_msg("can't create backup file");
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78
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79 *sfx = '+';
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80 lock.l_type = F_WRLCK;
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81 lock.l_whence = SEEK_SET;
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82 lock.l_start = 0;
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83 lock.l_len = 0;
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84
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85 ret = fcntl(fileno(exfp), F_SETLK, &lock);
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86 if(ret < 0) perror_msg("Couldn't lock file %s",filename);
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87
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88 lock.l_type = F_UNLCK; //unlocking at a later stage
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89
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90 newfp = fopen(filenamesfx, "w+");
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91 if(!newfp) {
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92 error_msg("couldn't open file for writing");
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93 ret = -1;
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94 fclose(exfp);
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95 goto free_storage;
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96 }
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97
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98 ret = 0;
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99 namesfx = xmsprintf("%s:",username);
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100 while((line = get_line(fileno(exfp))) != NULL)
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101 {
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102 if(strncmp(line, namesfx, strlen(namesfx)) != 0)
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103 fprintf(newfp, "%s\n", line);
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104 else {
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105 char *current_ptr = NULL;
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106 fprintf(newfp, "%s%s:",namesfx,encrypted);
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107 current_ptr = get_nextcolon(line, ':'); //past username
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108 current_ptr++; //past colon ':' after username
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109 current_ptr = get_nextcolon(current_ptr, ':'); //past passwd
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110 current_ptr++; //past colon ':' after passwd
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111 if(shadow) {
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112 fprintf(newfp, "%u:",(unsigned)(time(NULL))/(24*60*60));
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113 current_ptr = get_nextcolon(current_ptr, ':');
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114 current_ptr++; //past time stamp colon.
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115 fprintf(newfp, "%s\n",current_ptr);
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116 }
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117 else {
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118 fprintf(newfp, "%s\n",current_ptr);
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119 }
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120 }
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121
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122 free(line);
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123 }
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124 free(namesfx);
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125 fcntl(fileno(exfp), F_SETLK, &lock);
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126 fclose(exfp);
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127
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128 errno = 0;
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129 fflush(newfp);
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130 fsync(fileno(newfp));
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131 fclose(newfp);
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132 rename(filenamesfx, filename);
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133 if(errno) {
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134 perror_msg("File Writing/Saving failed: ");
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135 unlink(filenamesfx);
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136 ret = -1;
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137 }
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138
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139 free_storage:
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140 free(filenamesfx);
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141 return ret;
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142 }
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