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root/repos/CCSAdmin/chsh.c

Comparing CCSAdmin/chsh.c (file contents):
Revision 562 by douglas, 2005-08-27T21:46:39-07:00 vs.
Revision 583 by douglas, 2005-11-21T12:56:05-08:00

#	Line 4 | Line 4
4		//
5		// Change Shell
6
7	–	#include <sys/utsname.h>
8	–
7		#include "common.h"
8
9		int main(int argc, char *argv[])
10		{
11	+	if (argc < 1)
12	+	return 1;
13	+
14	+	umask(S_IWGRP | S_IWOTH);
15	+
16		int exception;
17		jmp_buf environment;
18
#	Line 27 | Line 30 | int main(int argc, char *argv[])
30		return 1;
31		}
32
33	<	typedef struct
33	>	char *shell_regex = NULL;
34	>
35	>	{
36	>	size_t size = 0;
37	>
38	>	for (Shell shell = sh; shell <= custom; ++shell)
39	>	{
40	>	shell_regex = shell_regex ? realloc(shell_regex, size += strlen(shells[shell].name) + (shell != custom ? 1 : 0)) : calloc(size += strlen(shells[shell].name) + 2, 1);
41	>	strlcat(shell_regex, shells[shell].name, size);
42	>
43	>	if (shell != custom)
44	>	strlcat(shell_regex, "|", size);
45	>	}
46	>	}
47	>
48	>	char shell_regex_[strlen(shell_regex) + 12];
49	>
50	>	sprintf(shell_regex_, "^-shell=(%s)$", shell_regex);
51	>
52	>	regex_t shell_;
53	>
54	>	regcheck(regcomp(&shell_, shell_regex_, REG_EXTENDED), &shell_, environment);
55	>
56	>	char user[MAXLOGNAME] = "", *shell = NULL;
57	>
58	>	if (!getuid())
59		{
60	<	const char *name;
61	<	char *freebsd, *linux, *darwin;
60	>	regex_t user_;
61	>
62	>	regcheck(regcomp(&user_, "^-user=([a-z0-9]{1,16})$", REG_EXTENDED), &user_, environment);
63	>
64	>	for (int index = 1; index != argc; ++index)
65	>	{
66	>	regmatch_t match[2];
67	>
68	>	if (!regcheck(regexec(&user_, argv[index], 2, match, 0), &user_, environment))
69	>	strlcpy(user, argv[index] + match[1].rm_so, match[1].rm_eo - match[1].rm_so + 1);
70	>	else if (!regcheck(regexec(&shell_, argv[index], 2, match, 0), &shell_, environment))
71	>	shell = argv[index] + match[1].rm_so;
72	>	else
73	>	{
74	>	printf("Usage: %s -user=user [-shell=%s]\n", argv[0], shell_regex);
75	>
76	>	return 1;
77	>	}
78	>	}
79	>
80	>	regfree(&user_);
81	>
82	>	if (strlen(user))
83	>	goto on;
84	>	else
85	>	longjmp(environment, (int)"Cannot change root shell");
86		}
87	<	Shell;
87	>	else
88	>	for (int index = 1; index != argc; ++index)
89	>	{
90	>	regmatch_t match[2];
91	>
92	>	if (!regcheck(regexec(&shell_, argv[index], 2, match, 0), &shell_, environment))
93	>	shell = argv[index] + match[1].rm_so;
94	>	else
95	>	{
96	>	printf("Usage: %s [-shell=%s]\n", argv[0], shell_regex);
97	>
98	>	return 1;
99	>	}
100	>	}
101	>
102	>	struct passwd *entry = getpwuid(getuid());
103	>
104	>	if (!entry)
105	>	longjmp(environment, 1);
106	>
107	>	strlcpy(user, entry->pw_name, sizeof (user));
108	>	on:     regfree(&shell_);
109	>	authenticate(argv[0], environment);
110	>
111	>	if (!shell)
112	>	{
113	>	sprintf(shell_regex_, "^%s$", shell_regex);
114	>	regcheck(regcomp(&shell_, shell_regex_, REG_EXTENDED), &shell_, environment);
115	>
116	>	do
117	>	{
118	>	printf("Shell (");
119
120	<	typedef enum { sh, csh, tcsh, bash, ksh, zsh, _3sh, custom } Shells;
120	>	for (Shell shell = sh; shell <= custom; ++shell)
121	>	printf(shell != custom ? "%s, " : "%s): ", shells[shell].name);
122
123	<	Shell shells[] = {
124	<	{ "sh", "/bin/sh", "/bin/sh", "/bin/sh" },
41	<	{ "csh", "/bin/csh", "/bin/csh", "/bin/csh" },
42	<	{ "tcsh", "/bin/tcsh", "/bin/tcsh", "/bin/tcsh" },
43	<	{ "bash", "/usr/local/bin/bash", "/bin/bash", "/bin/bash" },
44	<	{ "ksh", "/usr/local/bin/ksh", "/bin/ksh", "/bin/ksh" },
45	<	{ "zsh", "/usr/local/bin/zsh", "/bin/zsh", "/bin/zsh" },
46	<	{ "3sh", "/ccs/bin/3sh", "/ccs/bin/3sh", "/ccs/bin/3sh" },
47	<	{ "custom", NULL, NULL, NULL }
48	<	};
123	>	size_t size;
124	>	char *shell_ = fcheck(fgetln(stdin, &size), stdin, environment);
125
126	<	for (Shells shell = sh; shell != custom; ++shell)
51	<	printf("%s, ", shells[shell].name);
126	>	shell = shell ? realloc(shell, size) : malloc(size);
127
128	<	printf("%s\n", shells[custom].name);
128	>	strlcpy(shell, shell_, size);
129	>	}
130	>	while (regcheck(regexec(&shell_, shell, 0, NULL, 0), &shell_, environment));
131	>
132	>	regfree(&shell_);
133	>	}
134	>
135	>	free(shell_regex);
136	>
137	>	Shells *shells_ = shells + custom;
138	>
139	>	for (Shell shell_ = sh; shell_ != custom; ++shell_)
140	>	if (!strcmp(shell, shells[shell_].name))
141	>	{
142	>	shells_ = shells + shell_;
143	>
144	>	goto no;
145	>	}
146	>
147	>	regex_t path;
148	>
149	>	regcheck(regcomp(&path, "^/.*[^/]$", REG_EXTENDED), &path, environment);
150	>	get("FreeBSD", &path, &shells_->freebsd, environment);
151	>	get("Linux", &path, &shells_->linux, environment);
152	>	get("Darwin", &path, &shells_->darwin, environment);
153	>	get("Solaris", &path, &shells_->solaris, environment);
154	>	regfree(&path);
155	>
156	>	no:     check(setuid(geteuid()), environment);
157	>
158	>	pid_t bash_;
159	>
160	>	if (!(bash_ = check(fork(), environment)))
161	>	{
162	>	check(setenv("USER", user, 1), environment);
163	>	setshells(shells_, environment);
164	>	check(execl("/ccs/bin/chsh.sh", argv[0], NULL), environment);
165	>	}
166	>
167	>	int status;
168	>
169	>	check(waitpid(bash_, &status, 0), environment);
170	>
171	>	if (WEXITSTATUS(status))
172	>	return 1;
173
174		return 0;
175		}

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