mirror of
https://github.com/sheumann/hush.git
synced 2024-11-19 08:31:11 +00:00
133 lines
2.4 KiB
C
133 lines
2.4 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* issue.c: issue printing code
|
|
*
|
|
* Copyright (C) 2003 Bastian Blank <waldi@tuxbox.org>
|
|
*
|
|
* Optimize and correcting OCRNL by Vladimir Oleynik <dzo@simtreas.ru>
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
|
|
*/
|
|
|
|
#include "libbb.h"
|
|
/* After libbb.h, since it needs sys/types.h on some systems */
|
|
#include <sys/utsname.h>
|
|
|
|
#define LOGIN " login: "
|
|
|
|
static const char fmtstr_d[] ALIGN1 = "%A, %d %B %Y";
|
|
static const char fmtstr_t[] ALIGN1 = "%H:%M:%S";
|
|
|
|
void FAST_FUNC print_login_issue(const char *issue_file, const char *tty)
|
|
{
|
|
FILE *fp;
|
|
int c;
|
|
char buf[256+1];
|
|
const char *outbuf;
|
|
time_t t;
|
|
struct utsname uts;
|
|
|
|
time(&t);
|
|
uname(&uts);
|
|
|
|
puts("\r"); /* start a new line */
|
|
|
|
fp = fopen_for_read(issue_file);
|
|
if (!fp)
|
|
return;
|
|
while ((c = fgetc(fp)) != EOF) {
|
|
outbuf = buf;
|
|
buf[0] = c;
|
|
buf[1] = '\0';
|
|
if (c == '\n') {
|
|
buf[1] = '\r';
|
|
buf[2] = '\0';
|
|
}
|
|
if (c == '\\' || c == '%') {
|
|
c = fgetc(fp);
|
|
switch (c) {
|
|
case 's':
|
|
outbuf = uts.sysname;
|
|
break;
|
|
case 'n':
|
|
case 'h':
|
|
outbuf = uts.nodename;
|
|
break;
|
|
case 'r':
|
|
outbuf = uts.release;
|
|
break;
|
|
case 'v':
|
|
outbuf = uts.version;
|
|
break;
|
|
case 'm':
|
|
outbuf = uts.machine;
|
|
break;
|
|
/* The field domainname of struct utsname is Linux specific. */
|
|
#if defined(__linux__)
|
|
case 'D':
|
|
case 'o':
|
|
outbuf = uts.domainname;
|
|
break;
|
|
#endif
|
|
case 'd':
|
|
strftime(buf, sizeof(buf), fmtstr_d, localtime(&t));
|
|
break;
|
|
case 't':
|
|
strftime(buf, sizeof(buf), fmtstr_t, localtime(&t));
|
|
break;
|
|
case 'l':
|
|
outbuf = tty;
|
|
break;
|
|
default:
|
|
buf[0] = c;
|
|
}
|
|
}
|
|
fputs(outbuf, stdout);
|
|
}
|
|
fclose(fp);
|
|
fflush_all();
|
|
}
|
|
|
|
void FAST_FUNC print_login_prompt(void)
|
|
{
|
|
char *hostname = safe_gethostname();
|
|
|
|
fputs(hostname, stdout);
|
|
fputs(LOGIN, stdout);
|
|
fflush_all();
|
|
free(hostname);
|
|
}
|
|
|
|
/* Clear dangerous stuff, set PATH */
|
|
static const char forbid[] ALIGN1 =
|
|
"ENV" "\0"
|
|
"BASH_ENV" "\0"
|
|
"HOME" "\0"
|
|
"IFS" "\0"
|
|
"SHELL" "\0"
|
|
"LD_LIBRARY_PATH" "\0"
|
|
"LD_PRELOAD" "\0"
|
|
"LD_TRACE_LOADED_OBJECTS" "\0"
|
|
"LD_BIND_NOW" "\0"
|
|
"LD_AOUT_LIBRARY_PATH" "\0"
|
|
"LD_AOUT_PRELOAD" "\0"
|
|
"LD_NOWARN" "\0"
|
|
"LD_KEEPDIR" "\0";
|
|
|
|
int FAST_FUNC sanitize_env_if_suid(void)
|
|
{
|
|
const char *p;
|
|
|
|
if (getuid() == geteuid())
|
|
return 0;
|
|
|
|
p = forbid;
|
|
do {
|
|
unsetenv(p);
|
|
p += strlen(p) + 1;
|
|
} while (*p);
|
|
putenv((char*)bb_PATH_root_path);
|
|
|
|
return 1; /* we indeed were run by different user! */
|
|
}
|