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/* Copyright 2000-2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/* apr_password_get.c: abstraction to provide for obtaining a password from the
* command line in whatever way the OS supports. In the best case, it's a
* wrapper for the system library's getpass() routine; otherwise, we
* use one we define ourselves.
*/
#include "apr_private.h"
#include "apr_strings.h"
#include "apr_lib.h"
#include "apr_errno.h"
#if APR_HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if APR_HAVE_ERRNO_H
#include <errno.h>
#endif
#if APR_HAVE_UNISTD_H
#include <unistd.h>
#endif
#if APR_HAVE_CONIO_H
#pragma warning(disable: 4032)
#include <conio.h>
#pragma warning(default: 4032)
#endif
#if APR_HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if APR_HAVE_STRING_H
#include <string.h>
#endif
#if APR_HAVE_STRINGS_H
#include <strings.h>
#endif
#if defined(HAVE_TERMIOS_H) && !defined(HAVE_GETPASS)
#include <termios.h>
#endif
#if !APR_CHARSET_EBCDIC
#define LF 10
#define CR 13
#else /* APR_CHARSET_EBCDIC */
#define LF '\n'
#define CR '\r'
#endif /* APR_CHARSET_EBCDIC */
#define MAX_STRING_LEN 256
#define ERR_OVERFLOW 5
#ifndef HAVE_GETPASS
/* MPE, Win32, NetWare and BeOS all lack a native getpass() */
#if !defined(HAVE_TERMIOS_H) && !defined(WIN32) && !defined(NETWARE)
/*
* MPE lacks getpass() and a way to suppress stdin echo. So for now, just
* issue the prompt and read the results with echo. (Ugh).
*/
static char *getpass(const char *prompt)
{
static char password[MAX_STRING_LEN];
fputs(prompt, stderr);
fgets((char *) &password, sizeof(password), stdin);
return (char *) &password;
}
#elif defined (HAVE_TERMIOS_H)
#include <stdio.h>
static char *getpass(const char *prompt)
{
struct termios attr;
static char password[MAX_STRING_LEN];
int n=0;
fputs(prompt, stderr);
fflush(stderr);
if (tcgetattr(STDIN_FILENO, &attr) != 0)
return NULL;
attr.c_lflag &= ~(ECHO);
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &attr) != 0)
return NULL;
while ((password[n] = getchar()) != '\n') {
if (n < sizeof(password) - 1 && password[n] >= ' ' && password[n] <= '~') {
n++;
} else {
fprintf(stderr,"\n");
fputs(prompt, stderr);
fflush(stderr);
n = 0;
}
}
password[n] = '\0';
printf("\n");
if (n > (MAX_STRING_LEN - 1)) {
password[MAX_STRING_LEN - 1] = '\0';
}
attr.c_lflag |= ECHO;
tcsetattr(STDIN_FILENO, TCSANOW, &attr);
return (char*) &password;
}
#else
/*
* Windows lacks getpass(). So we'll re-implement it here.
*/
static char *getpass(const char *prompt)
{
/* WCE lacks console. So the getpass is unsuported
* The only way is to use the GUI so the getpass should be implemented
* on per-application basis.
*/
#ifdef _WIN32_WCE
return NULL;
#else
static char password[128];
int n = 0;
int ch;
fputs(prompt, stderr);
while ((ch = _getch()) != '\r') {
if (ch == EOF) /* EOF */ {
fputs("[EOF]\n", stderr);
return NULL;
}
else if (ch == 0 || ch == 0xE0) {
/* FN Keys (0 or E0) are a sentinal for a FN code */
ch = (ch << 4) | _getch();
/* Catch {DELETE}, {<--}, Num{DEL} and Num{<--} */
if ((ch == 0xE53 || ch == 0xE4B || ch == 0x053 || ch == 0x04b) && n) {
password[--n] = '\0';
fputs("\b \b", stderr);
}
else {
fputc('\a', stderr);
}
}
else if ((ch == '\b' || ch == 127) && n) /* BS/DEL */ {
password[--n] = '\0';
fputs("\b \b", stderr);
}
else if (ch == 3) /* CTRL+C */ {
/* _getch() bypasses Ctrl+C but not Ctrl+Break detection! */
fputs("^C\n", stderr);
exit(-1);
}
else if (ch == 26) /* CTRL+Z */ {
fputs("^Z\n", stderr);
return NULL;
}
else if (ch == 27) /* ESC */ {
fputc('\n', stderr);
fputs(prompt, stderr);
n = 0;
}
else if ((n < sizeof(password) - 1) && !apr_iscntrl(ch)) {
password[n++] = ch;
fputc('*', stderr);
}
else {
fputc('\a', stderr);
}
}
fputc('\n', stderr);
password[n] = '\0';
return password;
#endif
}
#endif /* no getchar or _getch */
#endif /* no getpass */
/*
* Use the OS getpass() routine (or our own) to obtain a password from
* the input stream.
*
* Exit values:
* 0: Success
* 5: Partial success; entered text truncated to the size of the
* destination buffer
*
* Restrictions: Truncation also occurs according to the host system's
* getpass() semantics, or at position 255 if our own version is used,
* but the caller is *not* made aware of it unless their own buffer is
* smaller than our own.
*/
APR_DECLARE(apr_status_t) apr_password_get(const char *prompt, char *pwbuf, apr_size_t *bufsiz)
{
#ifdef HAVE_GETPASSPHRASE
char *pw_got = getpassphrase(prompt);
#else
char *pw_got = getpass(prompt);
#endif
apr_status_t rv = APR_SUCCESS;
if (!pw_got)
return APR_EINVAL;
if (strlen(pw_got) >= *bufsiz) {
rv = APR_ENAMETOOLONG;
}
apr_cpystrn(pwbuf, pw_got, *bufsiz);
memset(pw_got, 0, strlen(pw_got));
return rv;
}
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