"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 | * |
Denys Vlasenko | 0ef64bd | 2010-08-16 20:14:46 +0200 | [diff] [blame] | 9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 10 | */ |
| 11 | |
Denis Vlasenko | 9a7d38f | 2007-05-31 22:42:12 +0000 | [diff] [blame] | 12 | #include "libbb.h" |
Denys Vlasenko | 043b1e5 | 2009-09-06 12:47:55 +0200 | [diff] [blame] | 13 | /* After libbb.h, since it needs sys/types.h on some systems */ |
| 14 | #include <sys/utsname.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"; |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 19 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 20 | void FAST_FUNC print_login_issue(const char *issue_file, const char *tty) |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 21 | { |
Denis Vlasenko | ad6d6ff | 2008-07-12 23:47:24 +0000 | [diff] [blame] | 22 | FILE *fp; |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 23 | int c; |
"Vladimir N. Oleynik" | 7673cca | 2006-02-20 16:57:36 +0000 | [diff] [blame] | 24 | char buf[256+1]; |
Glenn L McGrath | 393183d | 2003-05-26 14:07:50 +0000 | [diff] [blame] | 25 | const char *outbuf; |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 26 | time_t t; |
| 27 | struct utsname uts; |
| 28 | |
| 29 | time(&t); |
| 30 | uname(&uts); |
| 31 | |
Denys Vlasenko | e4dcba1 | 2010-10-28 18:57:19 +0200 | [diff] [blame] | 32 | puts("\r"); /* start a new line */ |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 33 | |
Denis Vlasenko | 5415c85 | 2008-07-21 23:05:26 +0000 | [diff] [blame] | 34 | fp = fopen_for_read(issue_file); |
Denis Vlasenko | ad6d6ff | 2008-07-12 23:47:24 +0000 | [diff] [blame] | 35 | if (!fp) |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 36 | return; |
Denis Vlasenko | ad6d6ff | 2008-07-12 23:47:24 +0000 | [diff] [blame] | 37 | while ((c = fgetc(fp)) != EOF) { |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 38 | outbuf = buf; |
| 39 | buf[0] = c; |
| 40 | buf[1] = '\0'; |
Denis Vlasenko | 51742f4 | 2007-04-12 00:32:05 +0000 | [diff] [blame] | 41 | if (c == '\n') { |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 42 | buf[1] = '\r'; |
| 43 | buf[2] = '\0'; |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 44 | } |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 45 | if (c == '\\' || c == '%') { |
Denis Vlasenko | ad6d6ff | 2008-07-12 23:47:24 +0000 | [diff] [blame] | 46 | c = fgetc(fp); |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 47 | switch (c) { |
| 48 | case 's': |
| 49 | outbuf = uts.sysname; |
| 50 | break; |
| 51 | case 'n': |
Denis Vlasenko | 6f1713f | 2008-02-25 23:23:58 +0000 | [diff] [blame] | 52 | case 'h': |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 53 | outbuf = uts.nodename; |
| 54 | break; |
| 55 | case 'r': |
| 56 | outbuf = uts.release; |
| 57 | break; |
| 58 | case 'v': |
| 59 | outbuf = uts.version; |
| 60 | break; |
| 61 | case 'm': |
| 62 | outbuf = uts.machine; |
| 63 | break; |
Denys Vlasenko | da49f58 | 2009-07-08 02:58:38 +0200 | [diff] [blame] | 64 | /* The field domainname of struct utsname is Linux specific. */ |
| 65 | #if defined(__linux__) |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 66 | case 'D': |
| 67 | case 'o': |
Denis Vlasenko | ad6d6ff | 2008-07-12 23:47:24 +0000 | [diff] [blame] | 68 | outbuf = uts.domainname; |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 69 | break; |
Denys Vlasenko | 5a49d28 | 2009-05-19 13:18:45 +0200 | [diff] [blame] | 70 | #endif |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 71 | case 'd': |
| 72 | strftime(buf, sizeof(buf), fmtstr_d, localtime(&t)); |
| 73 | break; |
| 74 | case 't': |
maxwen | 27116ba | 2015-08-14 21:41:28 +0200 | [diff] [blame] | 75 | strftime_HHMMSS(buf, sizeof(buf), &t); |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 76 | break; |
Denis Vlasenko | 6ae8079 | 2006-10-31 17:34:44 +0000 | [diff] [blame] | 77 | case 'l': |
| 78 | outbuf = tty; |
| 79 | break; |
| 80 | default: |
| 81 | buf[0] = c; |
| 82 | } |
| 83 | } |
| 84 | fputs(outbuf, stdout); |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 85 | } |
Denis Vlasenko | ad6d6ff | 2008-07-12 23:47:24 +0000 | [diff] [blame] | 86 | fclose(fp); |
Denys Vlasenko | 8131eea | 2009-11-02 14:19:51 +0100 | [diff] [blame] | 87 | fflush_all(); |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 88 | } |
| 89 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 90 | void FAST_FUNC print_login_prompt(void) |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 91 | { |
Denis Vlasenko | 6f1713f | 2008-02-25 23:23:58 +0000 | [diff] [blame] | 92 | char *hostname = safe_gethostname(); |
Denis Vlasenko | c693840 | 2008-03-24 02:18:03 +0000 | [diff] [blame] | 93 | |
Denis Vlasenko | 6f1713f | 2008-02-25 23:23:58 +0000 | [diff] [blame] | 94 | fputs(hostname, stdout); |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 95 | fputs(LOGIN, stdout); |
Denys Vlasenko | 8131eea | 2009-11-02 14:19:51 +0100 | [diff] [blame] | 96 | fflush_all(); |
Denis Vlasenko | 6f1713f | 2008-02-25 23:23:58 +0000 | [diff] [blame] | 97 | free(hostname); |
Glenn L McGrath | 6af21c2 | 2003-01-21 20:59:34 +0000 | [diff] [blame] | 98 | } |
Denis Vlasenko | 5281630 | 2007-11-06 05:26:51 +0000 | [diff] [blame] | 99 | |
| 100 | /* Clear dangerous stuff, set PATH */ |
| 101 | static const char forbid[] ALIGN1 = |
| 102 | "ENV" "\0" |
| 103 | "BASH_ENV" "\0" |
| 104 | "HOME" "\0" |
| 105 | "IFS" "\0" |
| 106 | "SHELL" "\0" |
| 107 | "LD_LIBRARY_PATH" "\0" |
| 108 | "LD_PRELOAD" "\0" |
| 109 | "LD_TRACE_LOADED_OBJECTS" "\0" |
| 110 | "LD_BIND_NOW" "\0" |
| 111 | "LD_AOUT_LIBRARY_PATH" "\0" |
| 112 | "LD_AOUT_PRELOAD" "\0" |
| 113 | "LD_NOWARN" "\0" |
| 114 | "LD_KEEPDIR" "\0"; |
| 115 | |
Denis Vlasenko | defc1ea | 2008-06-27 02:52:20 +0000 | [diff] [blame] | 116 | int FAST_FUNC sanitize_env_if_suid(void) |
Denis Vlasenko | 5281630 | 2007-11-06 05:26:51 +0000 | [diff] [blame] | 117 | { |
Denis Vlasenko | c9ca0a3 | 2008-02-18 11:08:33 +0000 | [diff] [blame] | 118 | const char *p; |
| 119 | |
| 120 | if (getuid() == geteuid()) |
| 121 | return 0; |
| 122 | |
| 123 | p = forbid; |
Denis Vlasenko | 5281630 | 2007-11-06 05:26:51 +0000 | [diff] [blame] | 124 | do { |
| 125 | unsetenv(p); |
| 126 | p += strlen(p) + 1; |
| 127 | } while (*p); |
| 128 | putenv((char*)bb_PATH_root_path); |
Denis Vlasenko | c9ca0a3 | 2008-02-18 11:08:33 +0000 | [diff] [blame] | 129 | |
| 130 | return 1; /* we indeed were run by different user! */ |
Denis Vlasenko | 5281630 | 2007-11-06 05:26:51 +0000 | [diff] [blame] | 131 | } |