2 * Copyright notice from original mutt:
3 * Copyright (C) 1999-2000 Brendan Cully <brendan@kublai.com>
5 * This file is part of mutt-ng, see http://www.muttng.org/.
6 * It's licensed under the GNU General Public License,
7 * please see the file GPL in the top level source directory.
10 /* GSS login/authentication code */
18 #include <lib-lib/macros.h>
20 #include <netinet/in.h>
23 # include <gssapi/gssapi.h>
24 # define gss_nt_service_name GSS_C_NT_HOSTBASED_SERVICE
26 # include <gssapi/gssapi.h>
27 # include <gssapi/gssapi_generic.h>
30 #define GSS_BUFSIZE 8192
32 #define GSS_AUTH_P_NONE 1
33 #define GSS_AUTH_P_INTEGRITY 2
34 #define GSS_AUTH_P_PRIVACY 4
37 #include "imap_private.h"
40 /* imap_auth_gss: AUTH=GSSAPI support. */
41 imap_auth_res_t imap_auth_gss (IMAP_DATA * idata, const char *method __attribute__ ((unused)))
43 gss_buffer_desc request_buf, send_token;
44 gss_buffer_t sec_token;
45 gss_name_t target_name;
50 OM_uint32 maj_stat, min_stat;
51 char buf1[GSS_BUFSIZE], buf2[GSS_BUFSIZE], server_conf_flags;
52 unsigned long buf_size;
55 if (!mutt_bit_isset (idata->capabilities, AGSSAPI))
56 return IMAP_AUTH_UNAVAIL;
58 if (mutt_account_getuser (&idata->conn->account))
59 return IMAP_AUTH_FAILURE;
61 /* get an IMAP service ticket for the server */
62 snprintf (buf1, sizeof (buf1), "imap@%s", idata->conn->account.host);
63 request_buf.value = buf1;
64 request_buf.length = m_strlen(buf1) + 1;
65 maj_stat = gss_import_name (&min_stat, &request_buf, gss_nt_service_name,
67 if (maj_stat != GSS_S_COMPLETE) {
68 return IMAP_AUTH_UNAVAIL;
71 /* Acquire initial credentials - without a TGT GSSAPI is UNAVAIL */
72 sec_token = GSS_C_NO_BUFFER;
73 context = GSS_C_NO_CONTEXT;
76 maj_stat = gss_init_sec_context (&min_stat, GSS_C_NO_CREDENTIAL, &context,
77 target_name, GSS_C_NO_OID,
78 GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG, 0,
79 GSS_C_NO_CHANNEL_BINDINGS, sec_token, NULL,
80 &send_token, (unsigned int *) &cflags,
82 if (maj_stat != GSS_S_COMPLETE && maj_stat != GSS_S_CONTINUE_NEEDED) {
83 gss_release_name (&min_stat, &target_name);
85 return IMAP_AUTH_UNAVAIL;
89 mutt_message _("Authenticating (GSSAPI)...");
91 imap_cmd_start (idata, "AUTHENTICATE GSSAPI");
93 /* expect a null continuation response ("+") */
95 rc = imap_cmd_step (idata);
96 while (rc == IMAP_CMD_CONTINUE);
98 if (rc != IMAP_CMD_RESPOND) {
99 gss_release_name (&min_stat, &target_name);
103 /* now start the security context initialisation loop... */
104 mutt_to_base64 ((unsigned char *) buf1, send_token.value, send_token.length,
106 gss_release_buffer (&min_stat, &send_token);
107 m_strcat(buf1, sizeof(buf1), "\r\n");
108 mutt_socket_write (idata->conn, buf1);
110 while (maj_stat == GSS_S_CONTINUE_NEEDED) {
111 /* Read server data */
113 rc = imap_cmd_step (idata);
114 while (rc == IMAP_CMD_CONTINUE);
116 if (rc != IMAP_CMD_RESPOND) {
117 gss_release_name (&min_stat, &target_name);
121 request_buf.length = mutt_from_base64 (buf2, idata->cmd.buf + 2);
122 request_buf.value = buf2;
123 sec_token = &request_buf;
125 /* Write client data */
126 maj_stat = gss_init_sec_context (&min_stat, GSS_C_NO_CREDENTIAL, &context,
127 target_name, GSS_C_NO_OID,
128 GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG,
129 0, GSS_C_NO_CHANNEL_BINDINGS, sec_token,
131 (unsigned int *) &cflags, NULL);
132 if (maj_stat != GSS_S_COMPLETE && maj_stat != GSS_S_CONTINUE_NEEDED) {
133 gss_release_name (&min_stat, &target_name);
137 mutt_to_base64 ((unsigned char *) buf1, send_token.value,
138 send_token.length, sizeof (buf1) - 2);
139 gss_release_buffer (&min_stat, &send_token);
140 m_strcat(buf1, sizeof(buf1), "\r\n");
141 mutt_socket_write (idata->conn, buf1);
144 gss_release_name (&min_stat, &target_name);
146 /* get security flags and buffer size */
148 rc = imap_cmd_step (idata);
149 while (rc == IMAP_CMD_CONTINUE);
151 if (rc != IMAP_CMD_RESPOND) {
154 request_buf.length = mutt_from_base64 (buf2, idata->cmd.buf + 2);
155 request_buf.value = buf2;
157 maj_stat = gss_unwrap (&min_stat, context, &request_buf, &send_token,
159 if (maj_stat != GSS_S_COMPLETE) {
160 gss_release_buffer (&min_stat, &send_token);
164 /* first octet is security levels supported. We want NONE */
165 server_conf_flags = ((char *) send_token.value)[0];
166 if (!(((char *) send_token.value)[0] & GSS_AUTH_P_NONE)) {
167 gss_release_buffer (&min_stat, &send_token);
171 /* we don't care about buffer size if we don't wrap content. But here it is */
172 ((char *) send_token.value)[0] = 0;
173 buf_size = ntohl (*((long *) send_token.value));
174 gss_release_buffer (&min_stat, &send_token);
176 /* agree to terms (hack!) */
177 buf_size = htonl (buf_size); /* not relevant without integrity/privacy */
178 memcpy (buf1, &buf_size, 4);
179 buf1[0] = GSS_AUTH_P_NONE;
180 /* server decides if principal can log in as user */
181 strncpy (buf1 + 4, idata->conn->account.user, sizeof (buf1) - 4);
182 request_buf.value = buf1;
183 request_buf.length = 4 + m_strlen(idata->conn->account.user) + 1;
184 maj_stat = gss_wrap (&min_stat, context, 0, GSS_C_QOP_DEFAULT, &request_buf,
185 &cflags, &send_token);
186 if (maj_stat != GSS_S_COMPLETE) {
190 mutt_to_base64 ((unsigned char *) buf1, send_token.value, send_token.length,
192 m_strcat(buf1, sizeof(buf1), "\r\n");
193 mutt_socket_write (idata->conn, buf1);
195 /* Joy of victory or agony of defeat? */
197 rc = imap_cmd_step (idata);
198 while (rc == IMAP_CMD_CONTINUE);
199 if (rc == IMAP_CMD_RESPOND) {
202 if (imap_code (idata->cmd.buf)) {
203 /* flush the security context */
204 maj_stat = gss_delete_sec_context (&min_stat, &context, &send_token);
206 /* send_token may contain a notification to the server to flush
207 * credentials. RFC 1731 doesn't specify what to do, and since this
208 * support is only for authentication, we'll assume the server knows
209 * enough to flush its own credentials */
210 gss_release_buffer (&min_stat, &send_token);
212 return IMAP_AUTH_SUCCESS;
218 mutt_socket_write (idata->conn, "*\r\n");
220 rc = imap_cmd_step (idata);
221 while (rc == IMAP_CMD_CONTINUE);
224 mutt_error _("GSSAPI authentication failed.");
226 return IMAP_AUTH_FAILURE;