repos/CCSAdmin/adduser.c

// Douglas Thrift
//
// CCS Computer Science
//
// Add User

#define _BSD_SOURCE

#include <errno.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#ifdef _Zweihander_
#include <fts.h>
#endif

#include "common.h"

int main(int argc, char *argv[])
{
        if (argc < 1)
                return 1;

        umask(S_IWGRP | S_IWOTH);
        
        int exception;
        jmp_buf environment;

        switch (exception = setjmp(environment))
        {
        case 0:
                break;
        case 1:
                perror(argv[0]);

                return 1;
        default:
                fprintf(stderr, "%s: %s\n", argv[0], (char *)exception);

                return 1;
        }

#ifdef _Zweihander_
        regex_t user_, name_;

        regcheck(regcomp(&user_, "^-user=([a-z0-9]{1,16})$", REG_EXTENDED), &user_, environment);
        regcheck(regcomp(&name_, "^-name=([^:]+)$", REG_EXTENDED), &name_, environment);

        char user[MAXLOGNAME] = "", *name = NULL;

        for (int index = 1; index != argc; ++index)
        {
                regmatch_t match[2];

                if (!regcheck(regexec(&user_, argv[index], 2, match, 0), &user_, environment))
                        strlcpy(user, argv[index] + match[1].rm_so, match[1].rm_eo - match[1].rm_so + 1);
                else if (!regcheck(regexec(&name_, argv[index], 2, match, 0), &name_, environment))
                        name = argv[index] + match[1].rm_so;
                else
                {
                        printf("Usage: %s [-user=user] [-name=name]\n", argv[0]);

                        return 1;
                }
        }

        regfree(&user_);
        regfree(&name_);
        authenticate(argv[0], environment);

        if (!strlen(user))
        {
                regcheck(regcomp(&user_, "^[a-z0-9]{1,16}$", REG_EXTENDED), &user_, environment);

                do
                {
                        printf("User Name: ");

                        size_t size;
                        char *user_ = fcheck(fgetln(stdin, &size), stdin, environment);

                        strlcpy(user, user_, size < sizeof (user) ? size : sizeof (user));
                }
                while (regcheck(regexec(&user_, user, 0, NULL, 0), &user_, environment));

                regfree(&user_);
        }

        if (!name)
        {
                regcheck(regcomp(&name_, "^[^:]+$", REG_EXTENDED), &name_, environment);
                get("Full Name", &name_, &name, environment);
                regfree(&name_);
        }

        char password[_PASSWORD_LEN];

        getpassword(password, environment);
        check(setuid(geteuid()), environment);

        char slappasswd[] = "/tmp/slappasswd.XXXXXX";

        putpassword(password, slappasswd, environment);

        int pipe_[2];

        check(pipe(pipe_), environment);

        pid_t bash_;

        if (!(bash_ = check(fork(), environment)))
        {
                check(dup2(pipe_[0], 0), environment);
                check(close(pipe_[1]), environment);
                check(setenv("USER", user, 1), environment);
                check(setenv("NAME", name, 1), environment);
                check(setenv("FILE", slappasswd, 1), environment);
                setshells(shells + bash, environment);
                check(execl("/ccs/bin/adduser.sh", argv[0], NULL), environment);
        }

        check(close(pipe_[0]), environment);

        FILE *smbpasswd = fdopen(pipe_[1], "w");

        if (fprintf(smbpasswd, "%s\n%s\n", password, password) < 0)
                longjmp(environment, 1);

        if (fclose(smbpasswd))
                longjmp(environment, 1);

        int status;

        check(waitpid(bash_, &status, 0), environment);
        check(unlink(slappasswd), environment);

        if (WEXITSTATUS(status))
                return 1;

        struct passwd *entry = getpwnam(user);

        if (!entry)
                longjmp(environment, 1);

        check(mkdir(entry->pw_dir, S_IRWXU | S_IRWXG | S_IRWXO), environment);
        check(chown(entry->pw_dir, entry->pw_uid, entry->pw_gid), environment);
        check(chdir(entry->pw_dir), environment);

        FTS *traversal = fts_open((char *[]){ "/usr/share/skel", "/ccs/skel", NULL }, FTS_LOGICAL | FTS_NOCHDIR, NULL);

        if (!traversal)
                longjmp(environment, 1);

        FTSENT *entity;

        while ((entity = fts_read(traversal)))
                switch (entity->fts_info)
                {
                case FTS_D:
                        if (entity->fts_level != FTS_ROOTLEVEL)
                        {
                                check(mkdir(entity->fts_name, entity->fts_statp->st_mode), environment);
                                check(chown(entity->fts_name, entry->pw_uid, entry->pw_gid), environment);
                                check(chdir(entity->fts_name), environment);
                        }

                        break;
                case FTS_DP:
                        if (entity->fts_level != FTS_ROOTLEVEL)
                                check(chdir(".."), environment);

                        break;
                case FTS_F:
                        {
                                int output = check(open(strncmp(entity->fts_name, "dot", 3) ? entity->fts_name : entity->fts_name + 3, O_WRONLY | O_CREAT | O_EXCL, entity->fts_statp->st_mode), environment), input = check(open(entity->fts_accpath, O_RDONLY), environment);
                                char buffer[entity->fts_statp->st_blksize];
                                size_t size;

                                while ((size = check(read(input, buffer, sizeof (buffer)), environment)))
                                        check(write(output, buffer, size), environment);

                                check(fchown(output, entry->pw_uid, entry->pw_gid), environment);
                                check(close(output), environment);
                                check(close(input), environment);
                        }

                        break;
                }

        if (errno)
                longjmp(environment, 1);

        if (fts_close(traversal))
                longjmp(environment, 1);
#else
        longjmp(environment, (int)"Log in to zweihander.ccs.ucsb.edu to add users");
#endif

        return 0;
}
Revision:	691
Committed:	2006-03-07T16:38:32-08:00 (19 years, 3 months ago) by douglas
Content type:	text/x-c
File size:	4723 byte(s)
Log Message:	Fixed bug where adduser was setting the default shell to sh instead of bash.
#	Content
1	// Douglas Thrift
2	//
3	// CCS Computer Science
4	//
5	// Add User
6
7	#define _BSD_SOURCE
8
9	#include <errno.h>
10	#include <sys/resource.h>
11	#include <sys/time.h>
12	#include <sys/types.h>
13	#include <sys/stat.h>
14	#include <fcntl.h>
15
16	#ifdef _Zweihander_
17	#include <fts.h>
18	#endif
19
20	#include "common.h"
21
22	int main(int argc, char *argv[])
23	{
24	if (argc < 1)
25	return 1;
26
27	umask(S_IWGRP \| S_IWOTH);
28
29	int exception;
30	jmp_buf environment;
31
32	switch (exception = setjmp(environment))
33	{
34	case 0:
35	break;
36	case 1:
37	perror(argv[0]);
38
39	return 1;
40	default:
41	fprintf(stderr, "%s: %s\n", argv[0], (char *)exception);
42
43	return 1;
44	}
45
46	#ifdef _Zweihander_
47	regex_t user_, name_;
48
49	regcheck(regcomp(&user_, "^-user=([a-z0-9]{1,16})$", REG_EXTENDED), &user_, environment);
50	regcheck(regcomp(&name_, "^-name=([^:]+)$", REG_EXTENDED), &name_, environment);
51
52	char user[MAXLOGNAME] = "", *name = NULL;
53
54	for (int index = 1; index != argc; ++index)
55	{
56	regmatch_t match[2];
57
58	if (!regcheck(regexec(&user_, argv[index], 2, match, 0), &user_, environment))
59	strlcpy(user, argv[index] + match[1].rm_so, match[1].rm_eo - match[1].rm_so + 1);
60	else if (!regcheck(regexec(&name_, argv[index], 2, match, 0), &name_, environment))
61	name = argv[index] + match[1].rm_so;
62	else
63	{
64	printf("Usage: %s [-user=user] [-name=name]\n", argv[0]);
65
66	return 1;
67	}
68	}
69
70	regfree(&user_);
71	regfree(&name_);
72	authenticate(argv[0], environment);
73
74	if (!strlen(user))
75	{
76	regcheck(regcomp(&user_, "^[a-z0-9]{1,16}$", REG_EXTENDED), &user_, environment);
77
78	do
79	{
80	printf("User Name: ");
81
82	size_t size;
83	char *user_ = fcheck(fgetln(stdin, &size), stdin, environment);
84
85	strlcpy(user, user_, size < sizeof (user) ? size : sizeof (user));
86	}
87	while (regcheck(regexec(&user_, user, 0, NULL, 0), &user_, environment));
88
89	regfree(&user_);
90	}
91
92	if (!name)
93	{
94	regcheck(regcomp(&name_, "^[^:]+$", REG_EXTENDED), &name_, environment);
95	get("Full Name", &name_, &name, environment);
96	regfree(&name_);
97	}
98
99	char password[_PASSWORD_LEN];
100
101	getpassword(password, environment);
102	check(setuid(geteuid()), environment);
103
104	char slappasswd[] = "/tmp/slappasswd.XXXXXX";
105
106	putpassword(password, slappasswd, environment);
107
108	int pipe_[2];
109
110	check(pipe(pipe_), environment);
111
112	pid_t bash_;
113
114	if (!(bash_ = check(fork(), environment)))
115	{
116	check(dup2(pipe_[0], 0), environment);
117	check(close(pipe_[1]), environment);
118	check(setenv("USER", user, 1), environment);
119	check(setenv("NAME", name, 1), environment);
120	check(setenv("FILE", slappasswd, 1), environment);
121	setshells(shells + bash, environment);
122	check(execl("/ccs/bin/adduser.sh", argv[0], NULL), environment);
123	}
124
125	check(close(pipe_[0]), environment);
126
127	FILE *smbpasswd = fdopen(pipe_[1], "w");
128
129	if (fprintf(smbpasswd, "%s\n%s\n", password, password) < 0)
130	longjmp(environment, 1);
131
132	if (fclose(smbpasswd))
133	longjmp(environment, 1);
134
135	int status;
136
137	check(waitpid(bash_, &status, 0), environment);
138	check(unlink(slappasswd), environment);
139
140	if (WEXITSTATUS(status))
141	return 1;
142
143	struct passwd *entry = getpwnam(user);
144
145	if (!entry)
146	longjmp(environment, 1);
147
148	check(mkdir(entry->pw_dir, S_IRWXU \| S_IRWXG \| S_IRWXO), environment);
149	check(chown(entry->pw_dir, entry->pw_uid, entry->pw_gid), environment);
150	check(chdir(entry->pw_dir), environment);
151
152	FTS traversal = fts_open((char []){ "/usr/share/skel", "/ccs/skel", NULL }, FTS_LOGICAL \| FTS_NOCHDIR, NULL);
153
154	if (!traversal)
155	longjmp(environment, 1);
156
157	FTSENT *entity;
158
159	while ((entity = fts_read(traversal)))
160	switch (entity->fts_info)
161	{
162	case FTS_D:
163	if (entity->fts_level != FTS_ROOTLEVEL)
164	{
165	check(mkdir(entity->fts_name, entity->fts_statp->st_mode), environment);
166	check(chown(entity->fts_name, entry->pw_uid, entry->pw_gid), environment);
167	check(chdir(entity->fts_name), environment);
168	}
169
170	break;
171	case FTS_DP:
172	if (entity->fts_level != FTS_ROOTLEVEL)
173	check(chdir(".."), environment);
174
175	break;
176	case FTS_F:
177	{
178	int output = check(open(strncmp(entity->fts_name, "dot", 3) ? entity->fts_name : entity->fts_name + 3, O_WRONLY \| O_CREAT \| O_EXCL, entity->fts_statp->st_mode), environment), input = check(open(entity->fts_accpath, O_RDONLY), environment);
179	char buffer[entity->fts_statp->st_blksize];
180	size_t size;
181
182	while ((size = check(read(input, buffer, sizeof (buffer)), environment)))
183	check(write(output, buffer, size), environment);
184
185	check(fchown(output, entry->pw_uid, entry->pw_gid), environment);
186	check(close(output), environment);
187	check(close(input), environment);
188	}
189
190	break;
191	}
192
193	if (errno)
194	longjmp(environment, 1);
195
196	if (fts_close(traversal))
197	longjmp(environment, 1);
198	#else
199	longjmp(environment, (int)"Log in to zweihander.ccs.ucsb.edu to add users");
200	#endif
201
202	return 0;
203	}