"Robert P. J. Day" | 63fc1a9 | 2006-07-02 19:47:05 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 2 | /* |
| 3 | * issue.c: issue printing code |
| 4 | * |
| 5 | * Copyright (C) 2003 Bastian Blank <waldi@tuxbox.org> |
| 6 | * |
Glenn L McGrath | 393183d | 2003-05-26 14:07:50 +0000 | [diff] [blame] | 7 | * Optimize and correcting OCRNL by Vladimir Oleynik <dzo@simtreas.ru> |
"Robert P. J. Day" | 5d8843e | 2006-07-10 11:41:19 +0000 | [diff] [blame] | 8 | * |
| 9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 10 | */ |
| 11 | |
Glenn L McGrath | 393183d | 2003-05-26 14:07:50 +0000 | [diff] [blame] | 12 | #include <sys/param.h> /* MAXHOSTNAMELEN */ |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 13 | #include <sys/utsname.h> |
Denis Vlasenko | 9a7d38f | 2007-05-31 22:42:12 +0000 | [diff] [blame] | 14 | #include "libbb.h" |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 15 | |
| 16 | #define LOGIN " login: " |
| 17 | |
Denis Vlasenko | 6ca409e | 2007-08-12 20:58:27 +0000 | [diff] [blame] | 18 | static const char fmtstr_d[] ALIGN1 = "%A, %d %B %Y"; |
| 19 | static const char fmtstr_t[] ALIGN1 = "%H:%M:%S"; |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 20 | |
| 21 | void print_login_issue(const char *issue_file, const char *tty) |
| 22 | { |
| 23 | FILE *fd; |
| 24 | int c; |
"Vladimir N. Oleynik" | 7673cca | 2006-02-20 16:57:36 +0000 | [diff] [blame] | 25 | char buf[256+1]; |
Glenn L McGrath | 393183d | 2003-05-26 14:07:50 +0000 | [diff] [blame] | 26 | const char *outbuf; |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 27 | time_t t; |
| 28 | struct utsname uts; |
| 29 | |
| 30 | time(&t); |
| 31 | uname(&uts); |
| 32 | |
Eric Andersen | a3bb3e6 | 2003-06-26 09:05:32 +0000 | [diff] [blame] | 33 | puts("\r"); /* start a new line */ |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 34 | |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 35 | fd = fopen(issue_file, "r"); |
| 36 | if (!fd) |
| 37 | return; |
| 38 | while ((c = fgetc(fd)) != EOF) { |
| 39 | outbuf = buf; |
| 40 | buf[0] = c; |
| 41 | buf[1] = '\0'; |
Denis Vlasenko | 51742f4 | 2007-04-12 00:32:05 +0000 | [diff] [blame] | 42 | if (c == '\n') { |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 43 | buf[1] = '\r'; |
| 44 | buf[2] = '\0'; |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 45 | } |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 46 | if (c == '\\' || c == '%') { |
| 47 | c = fgetc(fd); |
| 48 | switch (c) { |
| 49 | case 's': |
| 50 | outbuf = uts.sysname; |
| 51 | break; |
| 52 | case 'n': |
Denis Vlasenko | 6f1713f | 2008-02-25 23:23:58 +0000 | [diff] [blame] | 53 | case 'h': |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 54 | outbuf = uts.nodename; |
| 55 | break; |
| 56 | case 'r': |
| 57 | outbuf = uts.release; |
| 58 | break; |
| 59 | case 'v': |
| 60 | outbuf = uts.version; |
| 61 | break; |
| 62 | case 'm': |
| 63 | outbuf = uts.machine; |
| 64 | break; |
| 65 | case 'D': |
| 66 | case 'o': |
| 67 | c = getdomainname(buf, sizeof(buf) - 1); |
| 68 | buf[c >= 0 ? c : 0] = '\0'; |
| 69 | break; |
| 70 | case 'd': |
| 71 | strftime(buf, sizeof(buf), fmtstr_d, localtime(&t)); |
| 72 | break; |
| 73 | case 't': |
| 74 | strftime(buf, sizeof(buf), fmtstr_t, localtime(&t)); |
| 75 | break; |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 76 | case 'l': |
| 77 | outbuf = tty; |
| 78 | break; |
| 79 | default: |
| 80 | buf[0] = c; |
| 81 | } |
| 82 | } |
| 83 | fputs(outbuf, stdout); |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 84 | } |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 85 | fclose(fd); |
| 86 | fflush(stdout); |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 87 | } |
| 88 | |
| 89 | void print_login_prompt(void) |
| 90 | { |
Denis Vlasenko | 6f1713f | 2008-02-25 23:23:58 +0000 | [diff] [blame] | 91 | char *hostname = safe_gethostname(); |
| 92 | |
| 93 | fputs(hostname, stdout); |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 94 | fputs(LOGIN, stdout); |
| 95 | fflush(stdout); |
Denis Vlasenko | 6f1713f | 2008-02-25 23:23:58 +0000 | [diff] [blame] | 96 | free(hostname); |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 97 | } |
Denis Vlasenko | 5281630 | 2007-11-06 05:26:51 +0000 | [diff] [blame] | 98 | |
| 99 | /* Clear dangerous stuff, set PATH */ |
| 100 | static const char forbid[] ALIGN1 = |
| 101 | "ENV" "\0" |
| 102 | "BASH_ENV" "\0" |
| 103 | "HOME" "\0" |
| 104 | "IFS" "\0" |
| 105 | "SHELL" "\0" |
| 106 | "LD_LIBRARY_PATH" "\0" |
| 107 | "LD_PRELOAD" "\0" |
| 108 | "LD_TRACE_LOADED_OBJECTS" "\0" |
| 109 | "LD_BIND_NOW" "\0" |
| 110 | "LD_AOUT_LIBRARY_PATH" "\0" |
| 111 | "LD_AOUT_PRELOAD" "\0" |
| 112 | "LD_NOWARN" "\0" |
| 113 | "LD_KEEPDIR" "\0"; |
| 114 | |
Denis Vlasenko | c9ca0a3 | 2008-02-18 11:08:33 +0000 | [diff] [blame] | 115 | int sanitize_env_if_suid(void) |
Denis Vlasenko | 5281630 | 2007-11-06 05:26:51 +0000 | [diff] [blame] | 116 | { |
Denis Vlasenko | c9ca0a3 | 2008-02-18 11:08:33 +0000 | [diff] [blame] | 117 | const char *p; |
| 118 | |
| 119 | if (getuid() == geteuid()) |
| 120 | return 0; |
| 121 | |
| 122 | p = forbid; |
Denis Vlasenko | 5281630 | 2007-11-06 05:26:51 +0000 | [diff] [blame] | 123 | do { |
| 124 | unsetenv(p); |
| 125 | p += strlen(p) + 1; |
| 126 | } while (*p); |
| 127 | putenv((char*)bb_PATH_root_path); |
Denis Vlasenko | c9ca0a3 | 2008-02-18 11:08:33 +0000 | [diff] [blame] | 128 | |
| 129 | return 1; /* we indeed were run by different user! */ |
Denis Vlasenko | 5281630 | 2007-11-06 05:26:51 +0000 | [diff] [blame] | 130 | } |