source: branches/2.2.9/mindi-busybox/loginutils/adduser.c @ 2142

Last change on this file since 2142 was 1765, checked in by bruno, 12 years ago

Update to busybox 1.7.2

File size: 5.0 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * adduser - add users to /etc/passwd and /etc/shadow
4 *
5 * Copyright (C) 1999 by Lineo, inc. and John Beppu
6 * Copyright (C) 1999,2000,2001 by John Beppu <beppu@codepoet.org>
7 *
8 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
9 */
10
11#include "libbb.h"
12
13#define OPT_DONT_SET_PASS  (1 << 4)
14#define OPT_DONT_MAKE_HOME (1 << 6)
15
16
17/* remix */
18/* EDR recoded such that the uid may be passed in *p */
19static int passwd_study(const char *filename, struct passwd *p)
20{
21    enum { min = 500, max = 65000 };
22    FILE *passwd;
23    /* We are using reentrant fgetpwent_r() in order to avoid
24     * pulling in static buffers from libc (think static build here) */
25    char buffer[256];
26    struct passwd pw;
27    struct passwd *result;
28
29    passwd = xfopen(filename, "r");
30
31    /* EDR if uid is out of bounds, set to min */
32    if ((p->pw_uid > max) || (p->pw_uid < min))
33        p->pw_uid = min;
34
35    /* stuff to do:
36     * make sure login isn't taken;
37     * find free uid and gid;
38     */
39    while (!fgetpwent_r(passwd, &pw, buffer, sizeof(buffer), &result)) {
40        if (strcmp(pw.pw_name, p->pw_name) == 0) {
41            /* return 0; */
42            return 1;
43        }
44        if ((pw.pw_uid >= p->pw_uid) && (pw.pw_uid < max)
45            && (pw.pw_uid >= min)) {
46            p->pw_uid = pw.pw_uid + 1;
47        }
48    }
49
50    if (p->pw_gid == 0) {
51        /* EDR check for an already existing gid */
52        while (getgrgid(p->pw_uid) != NULL)
53            p->pw_uid++;
54
55        /* EDR also check for an existing group definition */
56        if (getgrnam(p->pw_name) != NULL)
57            return 3;
58
59        /* EDR create new gid always = uid */
60        p->pw_gid = p->pw_uid;
61    }
62
63    /* EDR bounds check */
64    if ((p->pw_uid > max) || (p->pw_uid < min))
65        return 2;
66
67    /* return 1; */
68    return 0;
69}
70
71static void addgroup_wrapper(struct passwd *p)
72{
73    char *cmd;
74
75    cmd = xasprintf("addgroup -g %d \"%s\"", p->pw_gid, p->pw_name);
76    system(cmd);
77    free(cmd);
78}
79
80static void passwd_wrapper(const char *login) ATTRIBUTE_NORETURN;
81
82static void passwd_wrapper(const char *login)
83{
84    static const char prog[] ALIGN1 = "passwd";
85
86    BB_EXECLP(prog, prog, login, NULL);
87    bb_error_msg_and_die("failed to execute '%s', you must set the password for '%s' manually", prog, login);
88}
89
90/* putpwent(3) remix */
91static int adduser(struct passwd *p)
92{
93    FILE *file;
94    int addgroup = !p->pw_gid;
95
96    /* make sure everything is kosher and setup uid && gid */
97    file = xfopen(bb_path_passwd_file, "a");
98    fseek(file, 0, SEEK_END);
99
100    switch (passwd_study(bb_path_passwd_file, p)) {
101        case 1:
102            bb_error_msg_and_die("%s: login already in use", p->pw_name);
103        case 2:
104            bb_error_msg_and_die("illegal uid or no uids left");
105        case 3:
106            bb_error_msg_and_die("%s: group name already in use", p->pw_name);
107    }
108
109    /* add to passwd */
110    if (putpwent(p, file) == -1) {
111        bb_perror_nomsg_and_die();
112    }
113    /* Do fclose even if !ENABLE_FEATURE_CLEAN_UP.
114     * We will exec passwd, files must be flushed & closed before that! */
115    fclose(file);
116
117#if ENABLE_FEATURE_SHADOWPASSWDS
118    /* add to shadow if necessary */
119    file = fopen_or_warn(bb_path_shadow_file, "a");
120    if (file) {
121        fseek(file, 0, SEEK_END);
122        fprintf(file, "%s:!:%ld:%d:%d:%d:::\n",
123                p->pw_name,             /* username */
124                time(NULL) / 86400,     /* sp->sp_lstchg */
125                0,                      /* sp->sp_min */
126                99999,                  /* sp->sp_max */
127                7);                     /* sp->sp_warn */
128        fclose(file);
129    }
130#endif
131
132    /* add to group */
133    /* addgroup should be responsible for dealing w/ gshadow */
134    /* if using a pre-existing group, don't create one */
135    if (addgroup) addgroup_wrapper(p);
136
137    /* Clear the umask for this process so it doesn't
138     * screw up the permissions on the mkdir and chown. */
139    umask(0);
140    if (!(option_mask32 & OPT_DONT_MAKE_HOME)) {
141        /* Set the owner and group so it is owned by the new user,
142           then fix up the permissions to 2755. Can't do it before
143           since chown will clear the setgid bit */
144        if (mkdir(p->pw_dir, 0755)
145        || chown(p->pw_dir, p->pw_uid, p->pw_gid)
146        || chmod(p->pw_dir, 02755)) {
147            bb_perror_msg("%s", p->pw_dir);
148        }
149    }
150
151    if (!(option_mask32 & OPT_DONT_SET_PASS)) {
152        /* interactively set passwd */
153        passwd_wrapper(p->pw_name);
154    }
155
156    return 0;
157}
158
159/*
160 * adduser will take a login_name as its first parameter.
161 *
162 * home
163 * shell
164 * gecos
165 *
166 * can be customized via command-line parameters.
167 */
168int adduser_main(int argc, char **argv);
169int adduser_main(int argc, char **argv)
170{
171    struct passwd pw;
172    const char *usegroup = NULL;
173
174    /* got root? */
175    if (geteuid()) {
176        bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
177    }
178
179    pw.pw_gecos = (char *)"Linux User,,,";
180    pw.pw_shell = (char *)DEFAULT_SHELL;
181    pw.pw_dir = NULL;
182
183    /* exactly one non-option arg */
184    opt_complementary = "=1";
185    getopt32(argv, "h:g:s:G:DSH", &pw.pw_dir, &pw.pw_gecos, &pw.pw_shell, &usegroup);
186    argv += optind;
187
188    /* create a passwd struct */
189    pw.pw_name = argv[0];
190    if (!pw.pw_dir) {
191        /* create string for $HOME if not specified already */
192        pw.pw_dir = xasprintf("/home/%s", argv[0]);
193    }
194    pw.pw_passwd = (char *)"x";
195    pw.pw_uid = 0;
196    pw.pw_gid = usegroup ? xgroup2gid(usegroup) : 0; /* exits on failure */
197
198    /* grand finale */
199    return adduser(&pw);
200}
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