projects / people / ms / dma.git / blame
| Commit | Line | Data |
|---|---|---|
| c1ebccb4 SS |
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 <fcntl.h> | |
| 45 | #include <grp.h> | |
| 46 | #include <paths.h> | |
| 47 | #include <pwd.h> | |
| 48 | #include <stdio.h> | |
| 49 | #include <unistd.h> | |
| 50 | ||
| 51 | #include "dma.h" | |
| 52 | ||
| 53 | /* | |
| 54 | * Create a mbox in /var/mail for a given user, or make sure | |
| 55 | * the permissions are correct for dma. | |
| 56 | */ | |
| 57 | ||
| 58 | int | |
| 59 | main(int argc, char **argv) | |
| 60 | { | |
| 61 | const char *user; | |
| 62 | struct passwd *pw; | |
| 63 | struct group *gr; | |
| 64 | uid_t user_uid; | |
| 65 | gid_t mail_gid; | |
| 66 | int error; | |
| 67 | char fn[PATH_MAX+1]; | |
| 68 | int f; | |
| 69 | ||
| 70 | /* | |
| 71 | * We take exactly one argument: the username. | |
| 72 | */ | |
| 73 | if (argc != 2) | |
| 74 | return (1); | |
| 75 | user = argv[1]; | |
| 76 | ||
| 77 | /* the username may not contain a pathname separator */ | |
| 78 | if (strchr(user, '/')) | |
| 79 | return (1); | |
| 80 | ||
| 81 | /* verify the user exists */ | |
| 82 | pw = getpwnam(user); | |
| 83 | if (!pw) | |
| 84 | return (1); | |
| 85 | ||
| 86 | user_uid = pw->pw_uid; | |
| 87 | ||
| 88 | gr = getgrnam(DMA_GROUP); | |
| 89 | if (!gr) | |
| 90 | return (1); | |
| 91 | ||
| 92 | mail_gid = gr->gr_gid; | |
| 93 | ||
| 94 | if (setgid(mail_gid) != 0) | |
| 95 | return (1); | |
| 96 | if (getegid() != mail_gid) | |
| 97 | return (1); | |
| 98 | ||
| 99 | error = snprintf(fn, sizeof(fn), "%s/%s", _PATH_MAILDIR, user); | |
| 100 | if (error < 0 || (size_t)error >= sizeof(fn)) | |
| 101 | return (1); | |
| 102 | ||
| 103 | f = open(fn, O_RDONLY|O_CREAT, 0600); | |
| 104 | if (f < 0) | |
| 105 | return (1); | |
| 106 | ||
| 107 | if (fchown(f, user_uid, mail_gid)) | |
| 108 | return (1); | |
| 109 | ||
| 110 | if (fchmod(f, 0660)) | |
| 111 | return (1); | |
| 112 | ||
| 113 | /* file should be present with the right owner and permissions */ | |
| 114 | ||
| 115 | return (0); | |
| 116 | } |