| | 1 | /* |
| | 2 | * Copyright (c) 2010 Simon Schubert <2@0x2c.org> |
| | 3 | * Copyright (c) 2008 The DragonFly Project. All rights reserved. |
| | 4 | * |
| | 5 | * This code is derived from software contributed to The DragonFly Project |
| | 6 | * by Simon 'corecode' Schubert <corecode@fs.ei.tum.de>. |
| | 7 | * |
| | 8 | * Redistribution and use in source and binary forms, with or without |
| | 9 | * modification, are permitted provided that the following conditions |
| | 10 | * are met: |
| | 11 | * |
| | 12 | * 1. Redistributions of source code must retain the above copyright |
| | 13 | * notice, this list of conditions and the following disclaimer. |
| | 14 | * 2. Redistributions in binary form must reproduce the above copyright |
| | 15 | * notice, this list of conditions and the following disclaimer in |
| | 16 | * the documentation and/or other materials provided with the |
| | 17 | * distribution. |
| | 18 | * 3. Neither the name of The DragonFly Project nor the names of its |
| | 19 | * contributors may be used to endorse or promote products derived |
| | 20 | * from this software without specific, prior written permission. |
| | 21 | * |
| | 22 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| | 23 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| | 24 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| | 25 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| | 26 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| | 27 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| | 28 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| | 29 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| | 30 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| | 31 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| | 32 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| | 33 | * SUCH DAMAGE. |
| | 34 | */ |
| | 35 | |
| | 36 | /* |
| | 37 | * This binary is setuid root. Use extreme caution when touching |
| | 38 | * user-supplied information. Keep the root window as small as possible. |
| | 39 | */ |
| | 40 | |
| | 41 | #include <sys/param.h> |
| | 42 | #include <sys/stat.h> |
| | 43 | |
| | 44 | #include <errno.h> |
| | 45 | #include <fcntl.h> |
| | 46 | #include <grp.h> |
| | 47 | #include <paths.h> |
| | 48 | #include <pwd.h> |
| | 49 | #include <stdio.h> |
| | 50 | #include <syslog.h> |
| | 51 | #include <unistd.h> |
| | 52 | |
| | 53 | #include "dma.h" |
| | 54 | |
| | 55 | |
| | 56 | static void |
| | 57 | logfail(const char *fmt, ...) |
| | 58 | { |
| | 59 | int oerrno = errno; |
| | 60 | va_list ap; |
| | 61 | char outs[1024]; |
| | 62 | |
| | 63 | outs[0] = 0; |
| | 64 | if (fmt != NULL) { |
| | 65 | va_start(ap, fmt); |
| | 66 | vsnprintf(outs, sizeof(outs), fmt, ap); |
| | 67 | va_end(ap); |
| | 68 | } |
| | 69 | |
| | 70 | errno = oerrno; |
| | 71 | if (*outs != 0) |
| | 72 | syslog(LOG_ERR, errno ? "%s: %m" : "%s", outs); |
| | 73 | else |
| | 74 | syslog(LOG_ERR, errno ? "%m" : "unknown error"); |
| | 75 | |
| | 76 | exit(1); |
| | 77 | } |
| | 78 | |
| | 79 | /* |
| | 80 | * Create a mbox in /var/mail for a given user, or make sure |
| | 81 | * the permissions are correct for dma. |
| | 82 | */ |
| | 83 | |
| | 84 | int |
| | 85 | main(int argc, char **argv) |
| | 86 | { |
| | 87 | const char *user; |
| | 88 | struct passwd *pw; |
| | 89 | struct group *gr; |
| | 90 | uid_t user_uid; |
| | 91 | gid_t mail_gid; |
| | 92 | int error; |
| | 93 | char fn[PATH_MAX+1]; |
| | 94 | int f; |
| | 95 | |
| | 96 | openlog("dma-mbox-create", 0, LOG_MAIL); |
| | 97 | |
| | 98 | errno = 0; |
| | 99 | gr = getgrnam(DMA_GROUP); |
| | 100 | if (!gr) |
| | 101 | logfail("cannot find dma group `%s'", DMA_GROUP); |
| | 102 | |
| | 103 | mail_gid = gr->gr_gid; |
| | 104 | |
| | 105 | if (setgid(mail_gid) != 0) |
| | 106 | logfail("cannot set gid to %d (%s)", mail_gid, DMA_GROUP); |
| | 107 | if (getegid() != mail_gid) |
| | 108 | logfail("cannot set gid to %d (%s), still at %d", mail_gid, DMA_GROUP, getegid()); |
| | 109 | |
| | 110 | /* |
| | 111 | * We take exactly one argument: the username. |
| | 112 | */ |
| | 113 | if (argc != 2) { |
| | 114 | errno = 0; |
| | 115 | logfail("no arguments"); |
| | 116 | } |
| | 117 | user = argv[1]; |
| | 118 | |
| | 119 | syslog(LOG_NOTICE, "creating mbox for `%s'", user); |
| | 120 | |
| | 121 | /* the username may not contain a pathname separator */ |
| | 122 | if (strchr(user, '/')) { |
| | 123 | errno = 0; |
| | 124 | logfail("path separator in username `%s'", user); |
| | 125 | exit(1); |
| | 126 | } |
| | 127 | |
| | 128 | /* verify the user exists */ |
| | 129 | errno = 0; |
| | 130 | pw = getpwnam(user); |
| | 131 | if (!pw) |
| | 132 | logfail("cannot find user `%s'", user); |
| | 133 | |
| | 134 | user_uid = pw->pw_uid; |
| | 135 | |
| | 136 | error = snprintf(fn, sizeof(fn), "%s/%s", _PATH_MAILDIR, user); |
| | 137 | if (error < 0 || (size_t)error >= sizeof(fn)) { |
| | 138 | if (error >= 0) { |
| | 139 | errno = 0; |
| | 140 | logfail("mbox path too long"); |
| | 141 | } |
| | 142 | logfail("cannot build mbox path for `%s/%s'", _PATH_MAILDIR, user); |
| | 143 | } |
| | 144 | |
| | 145 | f = open(fn, O_RDONLY|O_CREAT, 0600); |
| | 146 | if (f < 0) |
| | 147 | logfail("cannot open mbox `%s'", fn); |
| | 148 | |
| | 149 | if (fchown(f, user_uid, mail_gid)) |
| | 150 | logfail("cannot change owner of mbox `%s'", fn); |
| | 151 | |
| | 152 | if (fchmod(f, 0620)) |
| | 153 | logfail("cannot change permissions of mbox `%s'", fn); |
| | 154 | |
| | 155 | /* file should be present with the right owner and permissions */ |
| | 156 | |
| | 157 | syslog(LOG_NOTICE, "successfully created mbox for `%s'", user); |
| | 158 | |
| | 159 | return (0); |
| | 160 | } |
projects / dragonfly.git / blame_incremental