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/*
* Unix SMB/CIFS implementation.
*
* getpass.c - platform independent getpass function.
*
* Copyright (c) 2010-2012 Andreas Schneider <asn@samba.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/filesys.h"
#include "system/terminal.h"
#if !defined(SMB_MALLOC)
#undef malloc
#define SMB_MALLOC(s) malloc((s))
#endif
/**
* @internal
*
* @brief Get the password from the console.
*
* @param[in] prompt The prompt to display.
*
* @param[in] buf The buffer to fill.
*
* @param[in] len The length of the buffer.
*
* @param[in] verify Should the password be verified?
*
* @return 1 on success, 0 on error.
*/
static int samba_gets(const char *prompt, char *buf, size_t len, bool verify)
{
char *tmp;
char *ptr = NULL;
int ok = 0;
tmp = SMB_MALLOC(len);
if (tmp == NULL) {
return 0;
}
memset(tmp,'\0',len);
/* read the password */
while (!ok) {
if (buf[0] != '\0') {
fprintf(stdout, "%s[%s] ", prompt, buf);
} else {
fprintf(stdout, "%s", prompt);
}
fflush(stdout);
if (fgets(tmp, len, stdin) == NULL) {
free(tmp);
return 0;
}
if ((ptr = strchr(tmp, '\n'))) {
*ptr = '\0';
}
fprintf(stdout, "\n");
if (*tmp) {
strncpy(buf, tmp, len);
}
if (verify) {
char *key_string;
key_string = SMB_MALLOC(len);
if (key_string == NULL) {
break;
}
memset(key_string, '\0', len);
fprintf(stdout, "\nVerifying, please re-enter. %s", prompt);
fflush(stdout);
if (! fgets(key_string, len, stdin)) {
memset(key_string, '\0', len);
SAFE_FREE(key_string);
clearerr(stdin);
continue;
}
if ((ptr = strchr(key_string, '\n'))) {
*ptr = '\0';
}
fprintf(stdout, "\n");
if (strcmp(buf, key_string)) {
printf("\n\07\07Mismatch - try again\n");
memset(key_string, '\0', len);
SAFE_FREE(key_string);
fflush(stdout);
continue;
}
memset(key_string, '\0', len);
SAFE_FREE(key_string);
}
ok = 1;
}
memset(tmp, '\0', len);
free(tmp);
return ok;
}
/**
* @brief Get a password from the console.
*
* You should make sure that the buffer is an empty string!
*
* You can also use this function to ask for a username. Then you can fill the
* buffer with the username and it is shows to the users. If the users just
* presses enter the buffer will be untouched.
*
* @code
* char username[128];
*
* snprintf(username, sizeof(username), "john");
*
* samba_getpass("Username:", username, sizeof(username), 1, 0);
* @endcode
*
* The prompt will look like this:
*
* Username: [john]
*
* If you press enter then john is used as the username, or you can type it in
* to change it.
*
* @param[in] prompt The prompt to show to ask for the password.
*
* @param[out] buf The buffer the password should be stored. It NEEDS to be
* empty or filled out.
*
* @param[in] len The length of the buffer.
*
* @param[in] echo Should we echo what you type.
*
* @param[in] verify Should we ask for the password twice.
*
* @return 0 on success, -1 on error.
*/
int samba_getpass(const char *prompt,
char *buf,
size_t len,
bool echo,
bool verify)
{
struct termios attr;
struct termios old_attr;
int ok = 0;
int fd = -1;
/* fgets needs at least len - 1 */
if (prompt == NULL || buf == NULL || len < 2) {
return -1;
}
ZERO_STRUCT(attr);
ZERO_STRUCT(old_attr);
/* get local terminal attributes */
if (tcgetattr(STDIN_FILENO, &attr) < 0) {
perror("tcgetattr");
return -1;
}
/* save terminal attributes */
memcpy(&old_attr, &attr, sizeof(attr));
if((fd = fcntl(0, F_GETFL, 0)) < 0) {
perror("fcntl");
return -1;
}
/* disable echo */
if (!echo) {
attr.c_lflag &= ~(ECHO);
}
/* write attributes to terminal */
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &attr) < 0) {
perror("tcsetattr");
return -1;
}
/* disable nonblocking I/O */
if (fd & O_NDELAY) {
fcntl(0, F_SETFL, fd & ~O_NDELAY);
}
ok = samba_gets(prompt, buf, len, verify);
/* reset terminal */
tcsetattr(STDIN_FILENO, TCSANOW, &old_attr);
/* close fd */
if (fd & O_NDELAY) {
fcntl(0, F_SETFL, fd);
}
if (!ok) {
memset (buf, '\0', len);
return -1;
}
/* force termination */
buf[len - 1] = '\0';
return 0;
}
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