| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * issue.c: issue printing code
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| 4 | *
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| 5 | * Copyright (C) 2003 Bastian Blank <waldi@tuxbox.org>
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| 6 | *
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| 7 | * Optimize and correcting OCRNL by Vladimir Oleynik <dzo@simtreas.ru>
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| 8 | *
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| 9 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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| 10 | */
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| 11 |
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| 12 | #include "libbb.h"
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| 13 | /* After libbb.h, since it needs sys/types.h on some systems */
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| 14 | #include <sys/utsname.h>
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| 15 |
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| 16 | #define LOGIN " login: "
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| 17 |
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| 18 | static const char fmtstr_d[] ALIGN1 = "%A, %d %B %Y";
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| 19 | static const char fmtstr_t[] ALIGN1 = "%H:%M:%S";
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| 20 |
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| 21 | void FAST_FUNC print_login_issue(const char *issue_file, const char *tty)
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| 22 | {
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| 23 | FILE *fp;
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| 24 | int c;
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| 25 | char buf[256+1];
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| 26 | const char *outbuf;
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| 27 | time_t t;
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| 28 | struct utsname uts;
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| 29 |
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| 30 | time(&t);
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| 31 | uname(&uts);
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| 32 |
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| 33 | puts("\r"); /* start a new line */
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| 34 |
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| 35 | fp = fopen_for_read(issue_file);
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| 36 | if (!fp)
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| 37 | return;
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| 38 | while ((c = fgetc(fp)) != EOF) {
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| 39 | outbuf = buf;
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| 40 | buf[0] = c;
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| 41 | buf[1] = '\0';
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| 42 | if (c == '\n') {
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| 43 | buf[1] = '\r';
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| 44 | buf[2] = '\0';
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| 45 | }
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| 46 | if (c == '\\' || c == '%') {
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| 47 | c = fgetc(fp);
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| 48 | switch (c) {
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| 49 | case 's':
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| 50 | outbuf = uts.sysname;
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| 51 | break;
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| 52 | case 'n':
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| 53 | case 'h':
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| 54 | outbuf = uts.nodename;
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| 55 | break;
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| 56 | case 'r':
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| 57 | outbuf = uts.release;
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| 58 | break;
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| 59 | case 'v':
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| 60 | outbuf = uts.version;
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| 61 | break;
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| 62 | case 'm':
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| 63 | outbuf = uts.machine;
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| 64 | break;
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| 65 | /* The field domainname of struct utsname is Linux specific. */
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| 66 | #if defined(__linux__)
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| 67 | case 'D':
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| 68 | case 'o':
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| 69 | outbuf = uts.domainname;
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| 70 | break;
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| 71 | #endif
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| 72 | case 'd':
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| 73 | strftime(buf, sizeof(buf), fmtstr_d, localtime(&t));
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| 74 | break;
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| 75 | case 't':
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| 76 | strftime(buf, sizeof(buf), fmtstr_t, localtime(&t));
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| 77 | break;
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| 78 | case 'l':
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| 79 | outbuf = tty;
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| 80 | break;
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| 81 | default:
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| 82 | buf[0] = c;
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| 83 | }
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| 84 | }
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| 85 | fputs(outbuf, stdout);
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| 86 | }
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| 87 | fclose(fp);
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| 88 | fflush_all();
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| 89 | }
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| 90 |
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| 91 | void FAST_FUNC print_login_prompt(void)
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| 92 | {
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| 93 | char *hostname = safe_gethostname();
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| 94 |
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| 95 | fputs(hostname, stdout);
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| 96 | fputs(LOGIN, stdout);
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| 97 | fflush_all();
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| 98 | free(hostname);
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| 99 | }
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| 100 |
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| 101 | /* Clear dangerous stuff, set PATH */
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| 102 | static const char forbid[] ALIGN1 =
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| 103 | "ENV" "\0"
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| 104 | "BASH_ENV" "\0"
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| 105 | "HOME" "\0"
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| 106 | "IFS" "\0"
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| 107 | "SHELL" "\0"
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| 108 | "LD_LIBRARY_PATH" "\0"
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| 109 | "LD_PRELOAD" "\0"
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| 110 | "LD_TRACE_LOADED_OBJECTS" "\0"
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| 111 | "LD_BIND_NOW" "\0"
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| 112 | "LD_AOUT_LIBRARY_PATH" "\0"
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| 113 | "LD_AOUT_PRELOAD" "\0"
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| 114 | "LD_NOWARN" "\0"
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| 115 | "LD_KEEPDIR" "\0";
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| 116 |
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| 117 | int FAST_FUNC sanitize_env_if_suid(void)
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| 118 | {
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| 119 | const char *p;
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| 120 |
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| 121 | if (getuid() == geteuid())
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| 122 | return 0;
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| 123 |
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| 124 | p = forbid;
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| 125 | do {
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| 126 | unsetenv(p);
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| 127 | p += strlen(p) + 1;
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| 128 | } while (*p);
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| 129 | putenv((char*)bb_PATH_root_path);
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| 130 |
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| 131 | return 1; /* we indeed were run by different user! */
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| 132 | }
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