1 /*
2 *
3 * radrealms.c
4 *
5 * A pppd plugin which is stacked on top of radius.so. This plugin
6 * allows selection of alternate set of servers based on the user's realm.
7 *
8 * Author: Ben McKeegan ben@netservers.co.uk
9 *
10 * Copyright (C) 2002 Netservers
11 *
12 * This plugin may be distributed according to the terms of the GNU
13 * General Public License, version 2 or (at your option) any later version.
14 *
15 */
16
17 static char const RCSID[] =
18 "$Id: radrealms.c,v 1.2 2004/11/14 07:26:26 paulus Exp $";
19
20 #include "pppd.h"
21 #include "radiusclient.h"
22 #include <stdio.h>
23 #include <string.h>
24 #include <stdlib.h>
25
26 char pppd_version[] = VERSION;
27
28 char radrealms_config[MAXPATHLEN] = "/etc/radiusclient/realms";
29
30 static option_t Options[] = {
31 { "realms-config-file", o_string, &radrealms_config },
32 { NULL }
33 };
34
35 extern void (*radius_pre_auth_hook)(char const *user,
36 SERVER **authserver,
37 SERVER **acctserver);
38
39 static void
lookup_realm(char const * user,SERVER ** authserver,SERVER ** acctserver)40 lookup_realm(char const *user,
41 SERVER **authserver,
42 SERVER **acctserver)
43 {
44 char *realm;
45 FILE *fd;
46 SERVER *accts, *auths, *s;
47 char buffer[512], *p;
48 int line = 0;
49
50 auths = (SERVER *) malloc(sizeof(SERVER));
51 auths->max = 0;
52 accts = (SERVER *) malloc(sizeof(SERVER));
53 accts->max = 0;
54
55 realm = strrchr(user, '@');
56
57 if (realm) {
58 info("Looking up servers for realm '%s'", realm);
59 } else {
60 info("Looking up servers for DEFAULT realm");
61 }
62 if (realm) {
63 if (*(++realm) == '\0') {
64 realm = NULL;
65 }
66 }
67
68 if ((fd = fopen(radrealms_config, "r")) == NULL) {
69 option_error("cannot open %s", radrealms_config);
70 return;
71 }
72 info("Reading %s", radrealms_config);
73
74 while ((fgets(buffer, sizeof(buffer), fd) != NULL)) {
75 line++;
76
77 if ((*buffer == '\n') || (*buffer == '#') || (*buffer == '\0'))
78 continue;
79
80 buffer[strlen(buffer)-1] = '\0';
81
82 p = strtok(buffer, "\t ");
83
84 if (p == NULL || (strcmp(p, "authserver") !=0
85 && strcmp(p, "acctserver"))) {
86 fclose(fd);
87 option_error("%s: invalid line %d: %s", radrealms_config,
88 line, buffer);
89 return;
90 }
91 info("Parsing '%s' entry:", p);
92 s = auths;
93 if (p[1] == 'c') {
94 s = accts;
95 }
96 if (s->max >= SERVER_MAX)
97 continue;
98
99 if ((p = strtok(NULL, "\t ")) == NULL) {
100 fclose(fd);
101 option_error("%s: realm name missing on line %d: %s",
102 radrealms_config, line, buffer);
103 return;
104 }
105
106 if ((realm != NULL && strcmp(p, realm) == 0) ||
107 (realm == NULL && strcmp(p, "DEFAULT") == 0) ) {
108 info(" - Matched realm %s", p);
109 if ((p = strtok(NULL, ":")) == NULL) {
110 fclose(fd);
111 option_error("%s: server address missing on line %d: %s",
112 radrealms_config, line, buffer);
113 return;
114 }
115 s->name[s->max] = strdup(p);
116 info(" - Address is '%s'",p);
117 if ((p = strtok(NULL, "\t ")) == NULL) {
118 fclose(fd);
119 option_error("%s: server port missing on line %d: %s",
120 radrealms_config, line, buffer);
121 return;
122 }
123 s->port[s->max] = atoi(p);
124 info(" - Port is '%d'", s->port[s->max]);
125 s->max++;
126 } else
127 info(" - Skipping realm '%s'", p);
128 }
129 fclose(fd);
130
131 if (accts->max)
132 *acctserver = accts;
133
134 if (auths->max)
135 *authserver = auths;
136
137 return;
138 }
139
140 void
plugin_init(void)141 plugin_init(void)
142 {
143 radius_pre_auth_hook = lookup_realm;
144
145 add_options(Options);
146 info("RADIUS Realms plugin initialized.");
147 }
148