Commit | Line | Data |
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460b9539 | 1 | /* |
2 | * This file is part of DisOrder | |
5aff007d | 3 | * Copyright (C) 2005, 2007, 2008 Richard Kettlewell |
460b9539 | 4 | * |
e7eb3a27 | 5 | * This program is free software: you can redistribute it and/or modify |
460b9539 | 6 | * it under the terms of the GNU General Public License as published by |
e7eb3a27 | 7 | * the Free Software Foundation, either version 3 of the License, or |
460b9539 | 8 | * (at your option) any later version. |
9 | * | |
e7eb3a27 RK |
10 | * This program is distributed in the hope that it will be useful, |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
460b9539 | 15 | * You should have received a copy of the GNU General Public License |
e7eb3a27 | 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
460b9539 | 17 | */ |
18 | ||
05b75f8d | 19 | #include "common.h" |
460b9539 | 20 | |
21 | #include <pwd.h> | |
22 | #include <gcrypt.h> | |
23 | #include <errno.h> | |
24 | #include <unistd.h> | |
25 | #include <sys/stat.h> | |
26 | #include <fcntl.h> | |
460b9539 | 27 | |
f0feb22e | 28 | #include "client.h" |
460b9539 | 29 | #include "authorize.h" |
30 | #include "log.h" | |
31 | #include "configuration.h" | |
32 | #include "printf.h" | |
5b14453f | 33 | #include "base64.h" |
460b9539 | 34 | |
f0feb22e RK |
35 | /** @brief Create a DisOrder login for the calling user, called @p user |
36 | * @param client DisOrder client | |
e86021e4 | 37 | * @param user Username to create (UTF-8) |
0f55e905 | 38 | * @param rights Initial rights or NULL for default |
f0feb22e RK |
39 | * @return 0 on success, non-0 on error |
40 | */ | |
0f55e905 | 41 | int authorize(disorder_client *client, const char *user, const char *rights) { |
5b14453f RK |
42 | /* base64 is 3-into-4 so we make the password a multiple of 3 bytes long */ |
43 | uint8_t pwbin[12]; | |
44 | const struct passwd *pw; | |
45 | char *pwhex; | |
460b9539 | 46 | int fd; |
47 | FILE *fp; | |
5b14453f RK |
48 | char *configdir, *configpath, *configpathtmp; |
49 | struct stat sb; | |
50 | uid_t old_uid = getuid(); | |
51 | gid_t old_gid = getgid(); | |
460b9539 | 52 | |
460b9539 | 53 | if(!(pw = getpwnam(user))) |
5b14453f RK |
54 | /* If it's a NIS world then /etc/passwd may be a lie, but it emphasizes |
55 | * that it's talking about the login user, not the DisOrder user */ | |
56 | fatal(0, "no such user as %s in /etc/passwd", user); | |
57 | ||
58 | /* Choose a random password */ | |
59 | gcry_randomize(pwbin, sizeof pwbin, GCRY_STRONG_RANDOM); | |
60 | pwhex = mime_to_base64(pwbin, sizeof pwbin); | |
61 | ||
62 | /* Create the user on the server */ | |
63 | if(disorder_adduser(client, user, pwhex, rights)) | |
460b9539 | 64 | return -1; |
5b14453f RK |
65 | |
66 | /* Become the target user */ | |
67 | if(setegid(pw->pw_gid) < 0) | |
68 | fatal(errno, "setegid %lu", (unsigned long)pw->pw_gid); | |
69 | if(seteuid(pw->pw_uid) < 0) | |
70 | fatal(errno, "seteuid %lu", (unsigned long)pw->pw_uid); | |
71 | ||
72 | /* Make sure the configuration directory exists*/ | |
73 | byte_xasprintf(&configdir, "%s/.disorder", pw->pw_dir); | |
74 | if(mkdir(configdir, 02700) < 0) { | |
75 | if(errno != EEXIST) | |
76 | fatal(errno, "creating %s", configdir); | |
460b9539 | 77 | } |
460b9539 | 78 | |
5b14453f RK |
79 | /* Make sure the configuration file does not exist */ |
80 | byte_xasprintf(&configpath, "%s/passwd", configdir); | |
81 | if(lstat(configpath, &sb) == 0) | |
82 | fatal(0, "%s already exists", configpath); | |
83 | if(errno != ENOENT) | |
84 | fatal(errno, " checking %s", configpath); | |
85 | ||
86 | byte_xasprintf(&configpathtmp, "%s.new", configpath); | |
87 | ||
88 | /* Create config file with mode 600 */ | |
89 | if((fd = open(configpathtmp, O_WRONLY|O_CREAT, 0600)) < 0) | |
90 | fatal(errno, "error creating %s", configpathtmp); | |
91 | ||
92 | /* Write password */ | |
460b9539 | 93 | if(!(fp = fdopen(fd, "w"))) |
94 | fatal(errno, "error calling fdopen"); | |
95 | if(fprintf(fp, "password %s\n", pwhex) < 0 | |
96 | || fclose(fp) < 0) | |
5b14453f | 97 | fatal(errno, "error writing to %s", configpathtmp); |
460b9539 | 98 | |
5b14453f RK |
99 | /* Rename config file into place */ |
100 | if(rename(configpathtmp, configpath) < 0) | |
101 | fatal(errno, "error renaming %s to %s", configpathtmp, configpath); | |
f0feb22e | 102 | |
5b14453f RK |
103 | /* Put our identity back */ |
104 | if(seteuid(old_uid) < 0) | |
105 | fatal(errno, "seteuid %lu", (unsigned long)old_uid); | |
106 | if(setegid(old_gid) < 0) | |
107 | fatal(errno, "setegid %lu", (unsigned long)old_gid); | |
108 | ||
460b9539 | 109 | return 0; |
110 | } | |
111 | ||
112 | /* | |
113 | Local Variables: | |
114 | c-basic-offset:2 | |
115 | comment-column:40 | |
116 | fill-column:79 | |
117 | indent-tabs-mode:nil | |
118 | End: | |
119 | */ |