[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) tons of folks. Tracking down who wrote what
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| 6 | * isn't something I'm going to worry about... If you wrote something
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| 7 | * here, please feel free to acknowledge your work.
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| 8 | *
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| 9 | * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
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| 10 | * Permission has been granted to redistribute this code under the GPL.
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| 11 | *
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| 12 | * Licensed under GPLv2 or later, see file License in this tarball for details.
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| 13 | */
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| 14 |
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| 15 | #include "busybox.h"
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| 16 | #include <unistd.h>
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| 17 | #include <string.h>
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| 18 | #include <assert.h>
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| 19 |
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| 20 | #if ENABLE_SHOW_USAGE && !ENABLE_FEATURE_COMPRESS_USAGE
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| 21 | static const char usage_messages[] =
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| 22 | #define MAKE_USAGE
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| 23 | #include "usage.h"
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| 24 | #include "applets.h"
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| 25 | ;
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| 26 | #undef MAKE_USAGE
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| 27 | #else
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| 28 | #define usage_messages 0
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| 29 | #endif /* ENABLE_SHOW_USAGE */
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| 30 |
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| 31 | #undef APPLET
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| 32 | #undef APPLET_NOUSAGE
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| 33 | #undef PROTOTYPES
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| 34 | #include "applets.h"
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| 35 |
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| 36 | static struct BB_applet *applet_using;
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| 37 |
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| 38 | /* The -1 arises because of the {0,NULL,0,-1} entry above. */
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| 39 | const size_t NUM_APPLETS = (sizeof (applets) / sizeof (struct BB_applet) - 1);
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| 40 |
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| 41 |
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| 42 | #ifdef CONFIG_FEATURE_SUID_CONFIG
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| 43 |
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| 44 | #include <ctype.h>
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| 45 | #include "pwd_.h"
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| 46 | #include "grp_.h"
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| 47 |
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| 48 | #define CONFIG_FILE "/etc/busybox.conf"
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| 49 |
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| 50 | /* applets [] is const, so we have to define this "override" structure */
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| 51 | static struct BB_suid_config
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| 52 | {
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| 53 | struct BB_applet *m_applet;
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| 54 |
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| 55 | uid_t m_uid;
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| 56 | gid_t m_gid;
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| 57 | mode_t m_mode;
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| 58 |
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| 59 | struct BB_suid_config *m_next;
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| 60 | } *suid_config;
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| 61 |
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| 62 | static int suid_cfg_readable;
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| 63 |
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| 64 | /* check if u is member of group g */
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| 65 | static int ingroup (uid_t u, gid_t g)
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| 66 | {
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| 67 | struct group *grp = getgrgid (g);
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| 68 |
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| 69 | if (grp) {
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| 70 | char **mem;
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| 71 |
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| 72 | for (mem = grp->gr_mem; *mem; mem++) {
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| 73 | struct passwd *pwd = getpwnam (*mem);
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| 74 |
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| 75 | if (pwd && (pwd->pw_uid == u))
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| 76 | return 1;
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| 77 | }
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| 78 | }
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| 79 | return 0;
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| 80 | }
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| 81 |
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| 82 | /* This should probably be a libbb routine. In that case,
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| 83 | * I'd probably rename it to something like bb_trimmed_slice.
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| 84 | */
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| 85 | static char *get_trimmed_slice(char *s, char *e)
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| 86 | {
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| 87 | /* First, consider the value at e to be nul and back up until we
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| 88 | * reach a non-space char. Set the char after that (possibly at
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| 89 | * the original e) to nul. */
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| 90 | while (e-- > s) {
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| 91 | if (!isspace(*e)) {
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| 92 | break;
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| 93 | }
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| 94 | }
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| 95 | e[1] = 0;
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| 96 |
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| 97 | /* Next, advance past all leading space and return a ptr to the
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| 98 | * first non-space char; possibly the terminating nul. */
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| 99 | return skip_whitespace(s);
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| 100 | }
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| 101 |
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| 102 |
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| 103 | #define parse_error(x) { err=x; goto pe_label; }
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| 104 |
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| 105 | /* Don't depend on the tools to combine strings. */
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| 106 | static const char config_file[] = CONFIG_FILE;
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| 107 |
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| 108 | /* There are 4 chars + 1 nul for each of user/group/other. */
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| 109 | static const char mode_chars[] = "Ssx-\0Ssx-\0Ttx-";
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| 110 |
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| 111 | /* We don't supply a value for the nul, so an index adjustment is
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| 112 | * necessary below. Also, we use unsigned short here to save some
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| 113 | * space even though these are really mode_t values. */
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| 114 | static const unsigned short mode_mask[] = {
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| 115 | /* SST sst xxx --- */
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| 116 | S_ISUID, S_ISUID|S_IXUSR, S_IXUSR, 0, /* user */
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| 117 | S_ISGID, S_ISGID|S_IXGRP, S_IXGRP, 0, /* group */
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| 118 | 0, S_IXOTH, S_IXOTH, 0 /* other */
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| 119 | };
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| 120 |
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| 121 | static void parse_config_file(void)
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| 122 | {
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| 123 | struct BB_suid_config *sct_head;
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| 124 | struct BB_suid_config *sct;
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| 125 | struct BB_applet *applet;
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| 126 | FILE *f;
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| 127 | char *err;
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| 128 | char *s;
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| 129 | char *e;
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| 130 | int i, lc, section;
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| 131 | char buffer[256];
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| 132 | struct stat st;
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| 133 |
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| 134 | assert(!suid_config); /* Should be set to NULL by bss init. */
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| 135 |
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| 136 | if ((stat(config_file, &st) != 0) /* No config file? */
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| 137 | || !S_ISREG(st.st_mode) /* Not a regular file? */
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| 138 | || (st.st_uid != 0) /* Not owned by root? */
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| 139 | || (st.st_mode & (S_IWGRP | S_IWOTH)) /* Writable by non-root? */
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| 140 | || !(f = fopen(config_file, "r")) /* Can not open? */
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| 141 | ) {
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| 142 | return;
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| 143 | }
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| 144 |
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| 145 | suid_cfg_readable = 1;
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| 146 | sct_head = NULL;
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| 147 | section = lc = 0;
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| 148 |
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| 149 | do {
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| 150 | s = buffer;
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| 151 |
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| 152 | if (!fgets(s, sizeof(buffer), f)) { /* Are we done? */
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| 153 | if (ferror(f)) { /* Make sure it wasn't a read error. */
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| 154 | parse_error("reading");
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| 155 | }
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| 156 | fclose(f);
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| 157 | suid_config = sct_head; /* Success, so set the pointer. */
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| 158 | return;
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| 159 | }
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| 160 |
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| 161 | lc++; /* Got a (partial) line. */
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| 162 |
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| 163 | /* If a line is too long for our buffer, we consider it an error.
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| 164 | * The following test does mistreat one corner case though.
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| 165 | * If the final line of the file does not end with a newline and
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| 166 | * yet exactly fills the buffer, it will be treated as too long
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| 167 | * even though there isn't really a problem. But it isn't really
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| 168 | * worth adding code to deal with such an unlikely situation, and
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| 169 | * we do err on the side of caution. Besides, the line would be
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| 170 | * too long if it did end with a newline. */
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| 171 | if (!strchr(s, '\n') && !feof(f)) {
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| 172 | parse_error("line too long");
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| 173 | }
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| 174 |
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| 175 | /* Trim leading and trailing whitespace, ignoring comments, and
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| 176 | * check if the resulting string is empty. */
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| 177 | if (!*(s = get_trimmed_slice(s, strchrnul(s, '#')))) {
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| 178 | continue;
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| 179 | }
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| 180 |
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| 181 | /* Check for a section header. */
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| 182 |
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| 183 | if (*s == '[') {
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| 184 | /* Unlike the old code, we ignore leading and trailing
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| 185 | * whitespace for the section name. We also require that
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| 186 | * there are no stray characters after the closing bracket. */
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| 187 | if (!(e = strchr(s, ']')) /* Missing right bracket? */
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| 188 | || e[1] /* Trailing characters? */
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| 189 | || !*(s = get_trimmed_slice(s+1, e)) /* Missing name? */
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| 190 | ) {
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| 191 | parse_error("section header");
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| 192 | }
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| 193 | /* Right now we only have one section so just check it.
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| 194 | * If more sections are added in the future, please don't
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| 195 | * resort to cascading ifs with multiple strcasecmp calls.
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| 196 | * That kind of bloated code is all too common. A loop
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| 197 | * and a string table would be a better choice unless the
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| 198 | * number of sections is very small. */
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| 199 | if (strcasecmp(s, "SUID") == 0) {
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| 200 | section = 1;
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| 201 | continue;
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| 202 | }
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| 203 | section = -1; /* Unknown section so set to skip. */
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| 204 | continue;
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| 205 | }
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| 206 |
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| 207 | /* Process sections. */
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| 208 |
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| 209 | if (section == 1) { /* SUID */
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| 210 | /* Since we trimmed leading and trailing space above, we're
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| 211 | * now looking for strings of the form
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| 212 | * <key>[::space::]*=[::space::]*<value>
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| 213 | * where both key and value could contain inner whitespace. */
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| 214 |
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| 215 | /* First get the key (an applet name in our case). */
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| 216 | if (!!(e = strchr(s, '='))) {
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| 217 | s = get_trimmed_slice(s, e);
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| 218 | }
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| 219 | if (!e || !*s) { /* Missing '=' or empty key. */
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| 220 | parse_error("keyword");
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| 221 | }
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| 222 |
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| 223 | /* Ok, we have an applet name. Process the rhs if this
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| 224 | * applet is currently built in and ignore it otherwise.
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| 225 | * Note: This can hide config file bugs which only pop
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| 226 | * up when the busybox configuration is changed. */
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| 227 | if ((applet = find_applet_by_name(s))) {
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| 228 | /* Note: We currently don't check for duplicates!
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| 229 | * The last config line for each applet will be the
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| 230 | * one used since we insert at the head of the list.
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| 231 | * I suppose this could be considered a feature. */
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| 232 | sct = xmalloc(sizeof(struct BB_suid_config));
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| 233 | sct->m_applet = applet;
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| 234 | sct->m_mode = 0;
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| 235 | sct->m_next = sct_head;
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| 236 | sct_head = sct;
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| 237 |
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| 238 | /* Get the specified mode. */
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| 239 |
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| 240 | e = skip_whitespace(e+1);
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| 241 |
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| 242 | for (i=0 ; i < 3 ; i++) {
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| 243 | const char *q;
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| 244 | if (!*(q = strchrnul(mode_chars + 5*i, *e++))) {
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| 245 | parse_error("mode");
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| 246 | }
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| 247 | /* Adjust by -i to account for nul. */
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| 248 | sct->m_mode |= mode_mask[(q - mode_chars) - i];
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| 249 | }
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| 250 |
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| 251 | /* Now get the the user/group info. */
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| 252 |
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| 253 | s = skip_whitespace(e);
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| 254 |
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| 255 | /* Note: We require whitespace between the mode and the
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| 256 | * user/group info. */
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| 257 | if ((s == e) || !(e = strchr(s, '.'))) {
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| 258 | parse_error("<uid>.<gid>");
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| 259 | }
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| 260 | *e++ = 0;
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| 261 |
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| 262 | /* We can't use get_ug_id here since it would exit()
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| 263 | * if a uid or gid was not found. Oh well... */
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| 264 | {
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| 265 | char *e2;
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| 266 |
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| 267 | sct->m_uid = strtoul(s, &e2, 10);
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| 268 | if (*e2 || (s == e2)) {
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| 269 | struct passwd *pwd;
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| 270 | if (!(pwd = getpwnam(s))) {
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| 271 | parse_error("user");
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| 272 | }
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| 273 | sct->m_uid = pwd->pw_uid;
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| 274 | }
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| 275 |
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| 276 | sct->m_gid = strtoul(e, &e2, 10);
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| 277 | if (*e2 || (e == e2)) {
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| 278 | struct group *grp;
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| 279 | if (!(grp = getgrnam(e))) {
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| 280 | parse_error("group");
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| 281 | }
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| 282 | sct->m_gid = grp->gr_gid;
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| 283 | }
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| 284 | }
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| 285 | }
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| 286 | continue;
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| 287 | }
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| 288 |
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| 289 | /* Unknown sections are ignored. */
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| 290 |
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| 291 | /* Encountering configuration lines prior to seeing a
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| 292 | * section header is treated as an error. This is how
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| 293 | * the old code worked, but it may not be desirable.
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| 294 | * We may want to simply ignore such lines in case they
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| 295 | * are used in some future version of busybox. */
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| 296 | if (!section) {
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| 297 | parse_error("keyword outside section");
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| 298 | }
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| 299 |
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| 300 | } while (1);
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| 301 |
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| 302 | pe_label:
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| 303 | fprintf(stderr, "Parse error in %s, line %d: %s\n",
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| 304 | config_file, lc, err);
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| 305 |
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| 306 | fclose(f);
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| 307 | /* Release any allocated memory before returning. */
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| 308 | while (sct_head) {
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| 309 | sct = sct_head->m_next;
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| 310 | free(sct_head);
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| 311 | sct_head = sct;
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| 312 | }
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| 313 | return;
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| 314 | }
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| 315 |
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| 316 | #else
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| 317 | #define parse_config_file()
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| 318 | #endif /* CONFIG_FEATURE_SUID_CONFIG */
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| 319 |
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| 320 | #ifdef CONFIG_FEATURE_SUID
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| 321 | static void check_suid (struct BB_applet *applet)
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| 322 | {
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| 323 | uid_t ruid = getuid (); /* real [ug]id */
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| 324 | uid_t rgid = getgid ();
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| 325 |
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| 326 | #ifdef CONFIG_FEATURE_SUID_CONFIG
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| 327 | if (suid_cfg_readable) {
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| 328 | struct BB_suid_config *sct;
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| 329 |
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| 330 | for (sct = suid_config; sct; sct = sct->m_next) {
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| 331 | if (sct->m_applet == applet)
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| 332 | break;
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| 333 | }
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| 334 | if (sct) {
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| 335 | mode_t m = sct->m_mode;
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| 336 |
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| 337 | if (sct->m_uid == ruid) /* same uid */
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| 338 | m >>= 6;
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| 339 | else if ((sct->m_gid == rgid) || ingroup (ruid, sct->m_gid)) /* same group / in group */
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| 340 | m >>= 3;
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| 341 |
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| 342 | if (!(m & S_IXOTH)) /* is x bit not set ? */
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| 343 | bb_error_msg_and_die ("You have no permission to run this applet!");
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| 344 |
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| 345 | if ((sct->m_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) { /* *both* have to be set for sgid */
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| 346 | if (setegid (sct->m_gid))
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| 347 | bb_error_msg_and_die
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| 348 | ("BusyBox binary has insufficient rights to set proper GID for applet!");
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| 349 | } else
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| 350 | setgid (rgid); /* no sgid -> drop */
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| 351 |
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| 352 | if (sct->m_mode & S_ISUID) {
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| 353 | if (seteuid (sct->m_uid))
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| 354 | bb_error_msg_and_die
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| 355 | ("BusyBox binary has insufficient rights to set proper UID for applet!");
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| 356 | } else
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| 357 | setuid (ruid); /* no suid -> drop */
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| 358 | } else {
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| 359 | /* default: drop all privileges */
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| 360 | setgid (rgid);
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| 361 | setuid (ruid);
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| 362 | }
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| 363 | return;
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| 364 | } else {
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| 365 | #ifndef CONFIG_FEATURE_SUID_CONFIG_QUIET
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| 366 | static int onetime = 0;
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| 367 |
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| 368 | if (!onetime) {
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| 369 | onetime = 1;
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| 370 | fprintf (stderr, "Using fallback suid method\n");
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| 371 | }
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| 372 | #endif
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| 373 | }
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| 374 | #endif
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| 375 |
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| 376 | if (applet->need_suid == _BB_SUID_ALWAYS) {
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| 377 | if (geteuid () != 0)
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| 378 | bb_error_msg_and_die ("This applet requires root privileges!");
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| 379 | } else if (applet->need_suid == _BB_SUID_NEVER) {
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| 380 | setgid (rgid); /* drop all privileges */
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| 381 | setuid (ruid);
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| 382 | }
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| 383 | }
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| 384 | #else
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| 385 | #define check_suid(x)
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| 386 | #endif /* CONFIG_FEATURE_SUID */
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| 387 |
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| 388 |
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| 389 |
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| 390 | #if ENABLE_FEATURE_COMPRESS_USAGE
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| 391 |
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| 392 | #include "usage_compressed.h"
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| 393 | #include "unarchive.h"
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| 394 |
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| 395 | static const char *unpack_usage_messages(void)
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| 396 | {
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| 397 | int input[2], output[2], pid;
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| 398 | char *buf;
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| 399 |
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| 400 | if(pipe(input) < 0 || pipe(output) < 0)
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| 401 | exit(1);
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| 402 |
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| 403 | pid = fork();
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| 404 | switch (pid) {
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| 405 | case -1: /* error */
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| 406 | exit(1);
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| 407 | case 0: /* child */
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| 408 | close(input[1]);
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| 409 | close(output[0]);
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| 410 | uncompressStream(input[0], output[1]);
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| 411 | exit(0);
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| 412 | }
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| 413 | /* parent */
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| 414 |
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| 415 | close(input[0]);
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| 416 | close(output[1]);
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| 417 | pid = fork();
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| 418 | switch (pid) {
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| 419 | case -1: /* error */
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| 420 | exit(1);
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| 421 | case 0: /* child */
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| 422 | bb_full_write(input[1], packed_usage, sizeof(packed_usage));
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| 423 | exit(0);
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| 424 | }
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| 425 | /* parent */
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| 426 | close(input[1]);
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| 427 |
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| 428 | buf = xmalloc(SIZEOF_usage_messages);
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| 429 | bb_full_read(output[0], buf, SIZEOF_usage_messages);
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| 430 | return buf;
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| 431 | }
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| 432 |
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| 433 | #else
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| 434 | #define unpack_usage_messages() usage_messages
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| 435 | #endif /* ENABLE_FEATURE_COMPRESS_USAGE */
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| 436 |
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| 437 | void bb_show_usage (void)
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| 438 | {
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| 439 | if (ENABLE_SHOW_USAGE) {
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| 440 | const char *format_string;
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| 441 | const char *usage_string = unpack_usage_messages();
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| 442 | int i;
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| 443 |
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| 444 | for (i = applet_using - applets; i > 0;)
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| 445 | if (!*usage_string++) --i;
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| 446 |
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| 447 | format_string = "%s\n\nUsage: %s %s\n\n";
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| 448 | if (*usage_string == '\b')
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| 449 | format_string = "%s\n\nNo help available.\n\n";
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| 450 | fprintf (stderr, format_string, bb_msg_full_version,
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| 451 | applet_using->name, usage_string);
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| 452 | }
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| 453 |
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| 454 | exit (bb_default_error_retval);
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| 455 | }
|
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| 456 |
|
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| 457 | static int applet_name_compare (const void *x, const void *y)
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| 458 | {
|
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| 459 | const char *name = x;
|
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| 460 | const struct BB_applet *applet = y;
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| 461 |
|
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| 462 | return strcmp (name, applet->name);
|
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| 463 | }
|
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| 464 |
|
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| 465 | extern const size_t NUM_APPLETS;
|
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| 466 |
|
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| 467 | struct BB_applet *find_applet_by_name (const char *name)
|
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| 468 | {
|
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| 469 | return bsearch (name, applets, NUM_APPLETS, sizeof (struct BB_applet),
|
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| 470 | applet_name_compare);
|
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| 471 | }
|
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| 472 |
|
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| 473 | void run_applet_by_name (const char *name, int argc, char **argv)
|
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| 474 | {
|
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| 475 | if(ENABLE_FEATURE_SUID_CONFIG) parse_config_file ();
|
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| 476 |
|
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| 477 | if(!strncmp(name, "busybox", 7)) busybox_main(argc, argv);
|
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| 478 | /* Do a binary search to find the applet entry given the name. */
|
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| 479 | applet_using = find_applet_by_name(name);
|
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| 480 | if(applet_using) {
|
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| 481 | bb_applet_name = applet_using->name;
|
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| 482 | if(argc==2 && !strcmp(argv[1], "--help")) bb_show_usage ();
|
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| 483 | if(ENABLE_FEATURE_SUID) check_suid (applet_using);
|
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| 484 | exit ((*(applet_using->main)) (argc, argv));
|
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| 485 | }
|
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| 486 | }
|
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