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-rw-r--r--lib/password.c238
1 files changed, 116 insertions, 122 deletions
diff --git a/lib/password.c b/lib/password.c
index 8221a022..d1489eb3 100644
--- a/lib/password.c
+++ b/lib/password.c
@@ -1,5 +1,4 @@
-/* vi: set sw=4 ts=4 :
- * pwdutils.c - password read/update helper functions.
+/* pwdutils.c - password read/update helper functions.
*
* Copyright 2012 Ashwini Kumar <ak.ashwini@gmail.com>
*/
@@ -7,136 +6,131 @@
#include "toys.h"
#include <time.h>
-
int read_password(char * buff, int buflen, char* mesg)
-{
- int i = 0;
- struct termios termio, oldtermio;
- tcgetattr(0, &oldtermio);
- tcflush(0, TCIFLUSH);
- termio = oldtermio;
-
- termio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
- termio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP);
- tcsetattr(0, TCSANOW, &termio);
-
- fputs(mesg, stdout);
- fflush(stdout);
-
- while (1) {
- int ret = read(0, &buff[i], 1);
- if ( ret < 0 ) {
- buff[0] = 0;
- tcsetattr(0, TCSANOW, &oldtermio);
- return 1;
- }
- else if ( ret == 0 || buff[i] == '\n' ||
- buff[i] == '\r' || buflen == i+1) {
- buff[i] = '\0';
- break;
- }
- i++;
- }
-
- tcsetattr(0, TCSANOW, &oldtermio);
- puts("");
- fflush(stdout);
- return 0;
+{
+ int i = 0;
+ struct termios termio, oldtermio;
+ tcgetattr(0, &oldtermio);
+ tcflush(0, TCIFLUSH);
+ termio = oldtermio;
+
+ termio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
+ termio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP);
+ tcsetattr(0, TCSANOW, &termio);
+
+ fputs(mesg, stdout);
+ fflush(stdout);
+
+ while (1) {
+ int ret = read(0, &buff[i], 1);
+ if ( ret < 0 ) {
+ buff[0] = 0;
+ tcsetattr(0, TCSANOW, &oldtermio);
+ return 1;
+ } else if (ret == 0 || buff[i] == '\n' || buff[i] == '\r' || buflen == i+1)
+ {
+ buff[i] = '\0';
+ break;
+ }
+ i++;
+ }
+
+ tcsetattr(0, TCSANOW, &oldtermio);
+ puts("");
+ fflush(stdout);
+ return 0;
}
static char *get_nextcolon(const char *line, char delim)
{
- char *current_ptr = NULL;
- if((current_ptr = strchr(line, ':')) == NULL)
- error_exit("Invalid Entry\n");
- return current_ptr;
+ char *current_ptr = NULL;
+ if((current_ptr = strchr(line, ':')) == NULL) error_exit("Invalid Entry\n");
+ return current_ptr;
}
int update_password(char *filename, char* username, char* encrypted)
{
- char *filenamesfx = NULL, *namesfx = NULL;
- char *shadow = NULL, *sfx = NULL;
- FILE *exfp, *newfp;
- int ret = -1; //fail
- struct flock lock;
- char *line = NULL;
-
- shadow = strstr(filename, "shadow");
- filenamesfx = xmsprintf("%s+", filename);
- sfx = strchr(filenamesfx, '+');
-
- exfp = fopen(filename, "r+");
- if(!exfp) {
- perror_msg("Couldn't open file %s",filename);
- goto free_storage;
+ char *filenamesfx = NULL, *namesfx = NULL;
+ char *shadow = NULL, *sfx = NULL;
+ FILE *exfp, *newfp;
+ int ret = -1; //fail
+ struct flock lock;
+ char *line = NULL;
+
+ shadow = strstr(filename, "shadow");
+ filenamesfx = xmsprintf("%s+", filename);
+ sfx = strchr(filenamesfx, '+');
+
+ exfp = fopen(filename, "r+");
+ if(!exfp) {
+ perror_msg("Couldn't open file %s",filename);
+ goto free_storage;
+ }
+
+ *sfx = '-';
+ ret = unlink(filenamesfx);
+ ret = link(filename, filenamesfx);
+ if(ret < 0) error_msg("can't create backup file");
+
+ *sfx = '+';
+ lock.l_type = F_WRLCK;
+ lock.l_whence = SEEK_SET;
+ lock.l_start = 0;
+ lock.l_len = 0;
+
+ ret = fcntl(fileno(exfp), F_SETLK, &lock);
+ if(ret < 0) perror_msg("Couldn't lock file %s",filename);
+
+ lock.l_type = F_UNLCK; //unlocking at a later stage
+
+ newfp = fopen(filenamesfx, "w+");
+ if(!newfp) {
+ error_msg("couldn't open file for writing");
+ ret = -1;
+ fclose(exfp);
+ goto free_storage;
+ }
+
+ ret = 0;
+ namesfx = xmsprintf("%s:",username);
+ while((line = get_line(fileno(exfp))) != NULL)
+ {
+ if(strncmp(line, namesfx, strlen(namesfx)) != 0)
+ fprintf(newfp, "%s\n", line);
+ else {
+ char *current_ptr = NULL;
+ fprintf(newfp, "%s%s:",namesfx,encrypted);
+ current_ptr = get_nextcolon(line, ':'); //past username
+ current_ptr++; //past colon ':' after username
+ current_ptr = get_nextcolon(current_ptr, ':'); //past passwd
+ current_ptr++; //past colon ':' after passwd
+ if(shadow) {
+ fprintf(newfp, "%u:",(unsigned)(time(NULL))/(24*60*60));
+ current_ptr = get_nextcolon(current_ptr, ':');
+ current_ptr++; //past time stamp colon.
+ fprintf(newfp, "%s\n",current_ptr);
+ }
+ else fprintf(newfp, "%s\n",current_ptr);
}
- *sfx = '-';
- ret = unlink(filenamesfx);
- ret = link(filename, filenamesfx);
- if(ret < 0) error_msg("can't create backup file");
-
- *sfx = '+';
- lock.l_type = F_WRLCK;
- lock.l_whence = SEEK_SET;
- lock.l_start = 0;
- lock.l_len = 0;
-
- ret = fcntl(fileno(exfp), F_SETLK, &lock);
- if(ret < 0) perror_msg("Couldn't lock file %s",filename);
-
- lock.l_type = F_UNLCK; //unlocking at a later stage
-
- newfp = fopen(filenamesfx, "w+");
- if(!newfp) {
- error_msg("couldn't open file for writing");
- ret = -1;
- fclose(exfp);
- goto free_storage;
- }
-
- ret = 0;
- namesfx = xmsprintf("%s:",username);
- while((line = get_line(fileno(exfp))) != NULL)
- {
- if(strncmp(line, namesfx, strlen(namesfx)) != 0)
- fprintf(newfp, "%s\n", line);
- else {
- char *current_ptr = NULL;
- fprintf(newfp, "%s%s:",namesfx,encrypted);
- current_ptr = get_nextcolon(line, ':'); //past username
- current_ptr++; //past colon ':' after username
- current_ptr = get_nextcolon(current_ptr, ':'); //past passwd
- current_ptr++; //past colon ':' after passwd
- if(shadow) {
- fprintf(newfp, "%u:",(unsigned)(time(NULL))/(24*60*60));
- current_ptr = get_nextcolon(current_ptr, ':');
- current_ptr++; //past time stamp colon.
- fprintf(newfp, "%s\n",current_ptr);
- }
- else {
- fprintf(newfp, "%s\n",current_ptr);
- }
- }
-
- free(line);
- }
- free(namesfx);
- fcntl(fileno(exfp), F_SETLK, &lock);
- fclose(exfp);
-
- errno = 0;
- fflush(newfp);
- fsync(fileno(newfp));
- fclose(newfp);
- rename(filenamesfx, filename);
- if(errno) {
- perror_msg("File Writing/Saving failed: ");
- unlink(filenamesfx);
- ret = -1;
- }
+ free(line);
+ }
+ free(namesfx);
+ fcntl(fileno(exfp), F_SETLK, &lock);
+ fclose(exfp);
+
+ errno = 0;
+ fflush(newfp);
+ fsync(fileno(newfp));
+ fclose(newfp);
+ rename(filenamesfx, filename);
+ if(errno) {
+ perror_msg("File Writing/Saving failed: ");
+ unlink(filenamesfx);
+ ret = -1;
+ }
free_storage:
- free(filenamesfx);
- return ret;
-}
+ free(filenamesfx);
+ return ret;
+}