summaryrefslogtreecommitdiffstats
path: root/plugins/sudoers/auth/fwtk.c
blob: 36f7cd830b427e0239a40f3b27fd8cf271805bcc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
/*
 * Copyright (c) 1999-2005, 2008, 2010-2015
 *	Todd C. Miller <Todd.Miller@sudo.ws>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Sponsored in part by the Defense Advanced Research Projects
 * Agency (DARPA) and Air Force Research Laboratory, Air Force
 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
 */

/*
 * This is an open source non-commercial project. Dear PVS-Studio, please check it.
 * PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
 */

#include <config.h>

#ifdef HAVE_FWTK

#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STRING_H
# include <string.h>
#endif /* HAVE_STRING_H */
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif /* HAVE_STRING_H */
#include <unistd.h>
#include <pwd.h>

#include <auth.h>
#include <firewall.h>

#include "sudoers.h"
#include "sudo_auth.h"

int
sudo_fwtk_init(struct passwd *pw, sudo_auth *auth)
{
    static Cfg *confp;			/* Configuration entry struct */
    char resp[128];			/* Response from the server */
    debug_decl(sudo_fwtk_init, SUDOERS_DEBUG_AUTH)

    if ((confp = cfg_read("sudo")) == (Cfg *)-1) {
	sudo_warnx(U_("unable to read fwtk config"));
	debug_return_int(AUTH_FATAL);
    }

    if (auth_open(confp)) {
	sudo_warnx(U_("unable to connect to authentication server"));
	debug_return_int(AUTH_FATAL);
    }

    /* Get welcome message from auth server */
    if (auth_recv(resp, sizeof(resp))) {
	sudo_warnx(U_("lost connection to authentication server"));
	debug_return_int(AUTH_FATAL);
    }
    if (strncmp(resp, "Authsrv ready", 13) != 0) {
	sudo_warnx(U_("authentication server error:\n%s"), resp);
	debug_return_int(AUTH_FATAL);
    }

    debug_return_int(AUTH_SUCCESS);
}

int
sudo_fwtk_verify(struct passwd *pw, char *prompt, sudo_auth *auth, struct sudo_conv_callback *callback)
{
    char *pass;				/* Password from the user */
    char buf[SUDO_CONV_REPL_MAX + 12];	/* General prupose buffer */
    char resp[128];			/* Response from the server */
    int error;
    debug_decl(sudo_fwtk_verify, SUDOERS_DEBUG_AUTH)

    /* Send username to authentication server. */
    (void) snprintf(buf, sizeof(buf), "authorize %s 'sudo'", pw->pw_name);
restart:
    if (auth_send(buf) || auth_recv(resp, sizeof(resp))) {
	sudo_warnx(U_("lost connection to authentication server"));
	debug_return_int(AUTH_FATAL);
    }

    /* Get the password/response from the user. */
    if (strncmp(resp, "challenge ", 10) == 0) {
	(void) snprintf(buf, sizeof(buf), "%s\nResponse: ", &resp[10]);
	pass = auth_getpass(buf, SUDO_CONV_PROMPT_ECHO_OFF, callback);
	if (pass && *pass == '\0') {
	    free(pass);
	    pass = auth_getpass("Response [echo on]: ",
		SUDO_CONV_PROMPT_ECHO_ON, callback);
	}
    } else if (strncmp(resp, "chalnecho ", 10) == 0) {
	pass = auth_getpass(&resp[10], SUDO_CONV_PROMPT_ECHO_OFF, callback);
    } else if (strncmp(resp, "password", 8) == 0) {
	pass = auth_getpass(prompt, SUDO_CONV_PROMPT_ECHO_OFF, callback);
    } else if (strncmp(resp, "display ", 8) == 0) {
	sudo_printf(SUDO_CONV_INFO_MSG, "%s\n", &resp[8]);
	strlcpy(buf, "response dummy", sizeof(buf));
	goto restart;
    } else {
	sudo_warnx("%s", resp);
	debug_return_int(AUTH_FATAL);
    }
    if (!pass) {			/* ^C or error */
	debug_return_int(AUTH_INTR);
    }

    /* Send the user's response to the server */
    (void) snprintf(buf, sizeof(buf), "response '%s'", pass);
    if (auth_send(buf) || auth_recv(resp, sizeof(resp))) {
	sudo_warnx(U_("lost connection to authentication server"));
	error = AUTH_FATAL;
	goto done;
    }

    if (strncmp(resp, "ok", 2) == 0) {
	error = AUTH_SUCCESS;
	goto done;
    }

    /* Main loop prints "Permission Denied" or insult. */
    if (strcmp(resp, "Permission Denied.") != 0)
	sudo_warnx("%s", resp);
    error = AUTH_FAILURE;
done:
    memset_s(buf, sizeof(buf), 0, sizeof(buf));
    memset_s(pass, SUDO_PASS_MAX, 0, strlen(pass));
    free(pass);
    debug_return_int(error);
}

int
sudo_fwtk_cleanup(struct passwd *pw, sudo_auth *auth)
{
    debug_decl(sudo_fwtk_cleanup, SUDOERS_DEBUG_AUTH)

    auth_close();
    debug_return_int(AUTH_SUCCESS);
}

#endif /* HAVE_FWTK */