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 */
17 #include "imap_private.h"
20 #include <lib-lib/macros.h>
22 #include <netinet/in.h>
25 # include <gssapi/gssapi.h>
26 # define gss_nt_service_name GSS_C_NT_HOSTBASED_SERVICE
28 # include <gssapi/gssapi.h>
29 # include <gssapi/gssapi_generic.h>
32 #define GSS_BUFSIZE 8192
34 #define GSS_AUTH_P_NONE 1
35 #define GSS_AUTH_P_INTEGRITY 2
36 #define GSS_AUTH_P_PRIVACY 4
38 /* imap_auth_gss: AUTH=GSSAPI support. */
39 imap_auth_res_t imap_auth_gss (IMAP_DATA * idata, const char *method __attribute__ ((unused)))
41 gss_buffer_desc request_buf, send_token;
42 gss_buffer_t sec_token;
43 gss_name_t target_name;
48 OM_uint32 maj_stat, min_stat;
49 char buf1[GSS_BUFSIZE], buf2[GSS_BUFSIZE], server_conf_flags;
50 unsigned long buf_size;
53 if (!mutt_bit_isset (idata->capabilities, AGSSAPI))
54 return IMAP_AUTH_UNAVAIL;
56 if (mutt_account_getuser (&idata->conn->account))
57 return IMAP_AUTH_FAILURE;
59 /* get an IMAP service ticket for the server */
60 snprintf (buf1, sizeof (buf1), "imap@%s", idata->conn->account.host);
61 request_buf.value = buf1;
62 request_buf.length = m_strlen(buf1) + 1;
63 maj_stat = gss_import_name (&min_stat, &request_buf, gss_nt_service_name,
65 if (maj_stat != GSS_S_COMPLETE) {
66 return IMAP_AUTH_UNAVAIL;
69 /* Acquire initial credentials - without a TGT GSSAPI is UNAVAIL */
70 sec_token = GSS_C_NO_BUFFER;
71 context = GSS_C_NO_CONTEXT;
74 maj_stat = gss_init_sec_context (&min_stat, GSS_C_NO_CREDENTIAL, &context,
75 target_name, GSS_C_NO_OID,
76 GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG, 0,
77 GSS_C_NO_CHANNEL_BINDINGS, sec_token, NULL,
78 &send_token, (unsigned int *) &cflags,
80 if (maj_stat != GSS_S_COMPLETE && maj_stat != GSS_S_CONTINUE_NEEDED) {
81 gss_release_name (&min_stat, &target_name);
83 return IMAP_AUTH_UNAVAIL;
87 mutt_message _("Authenticating (GSSAPI)...");
89 imap_cmd_start (idata, "AUTHENTICATE GSSAPI");
91 /* expect a null continuation response ("+") */
93 rc = imap_cmd_step (idata);
94 while (rc == IMAP_CMD_CONTINUE);
96 if (rc != IMAP_CMD_RESPOND) {
97 gss_release_name (&min_stat, &target_name);
101 /* now start the security context initialisation loop... */
102 mutt_to_base64 ((unsigned char *) buf1, send_token.value, send_token.length,
104 gss_release_buffer (&min_stat, &send_token);
105 m_strcat(buf1, sizeof(buf1), "\r\n");
106 mutt_socket_write (idata->conn, buf1);
108 while (maj_stat == GSS_S_CONTINUE_NEEDED) {
109 /* Read server data */
111 rc = imap_cmd_step (idata);
112 while (rc == IMAP_CMD_CONTINUE);
114 if (rc != IMAP_CMD_RESPOND) {
115 gss_release_name (&min_stat, &target_name);
119 request_buf.length = mutt_from_base64 (buf2, idata->cmd.buf + 2);
120 request_buf.value = buf2;
121 sec_token = &request_buf;
123 /* Write client data */
124 maj_stat = gss_init_sec_context (&min_stat, GSS_C_NO_CREDENTIAL, &context,
125 target_name, GSS_C_NO_OID,
126 GSS_C_MUTUAL_FLAG | GSS_C_SEQUENCE_FLAG,
127 0, GSS_C_NO_CHANNEL_BINDINGS, sec_token,
129 (unsigned int *) &cflags, NULL);
130 if (maj_stat != GSS_S_COMPLETE && maj_stat != GSS_S_CONTINUE_NEEDED) {
131 gss_release_name (&min_stat, &target_name);
135 mutt_to_base64 ((unsigned char *) buf1, send_token.value,
136 send_token.length, sizeof (buf1) - 2);
137 gss_release_buffer (&min_stat, &send_token);
138 m_strcat(buf1, sizeof(buf1), "\r\n");
139 mutt_socket_write (idata->conn, buf1);
142 gss_release_name (&min_stat, &target_name);
144 /* get security flags and buffer size */
146 rc = imap_cmd_step (idata);
147 while (rc == IMAP_CMD_CONTINUE);
149 if (rc != IMAP_CMD_RESPOND) {
152 request_buf.length = mutt_from_base64 (buf2, idata->cmd.buf + 2);
153 request_buf.value = buf2;
155 maj_stat = gss_unwrap (&min_stat, context, &request_buf, &send_token,
157 if (maj_stat != GSS_S_COMPLETE) {
158 gss_release_buffer (&min_stat, &send_token);
162 /* first octet is security levels supported. We want NONE */
163 server_conf_flags = ((char *) send_token.value)[0];
164 if (!(((char *) send_token.value)[0] & GSS_AUTH_P_NONE)) {
165 gss_release_buffer (&min_stat, &send_token);
169 /* we don't care about buffer size if we don't wrap content. But here it is */
170 ((char *) send_token.value)[0] = 0;
171 buf_size = ntohl (*((long *) send_token.value));
172 gss_release_buffer (&min_stat, &send_token);
174 /* agree to terms (hack!) */
175 buf_size = htonl (buf_size); /* not relevant without integrity/privacy */
176 memcpy (buf1, &buf_size, 4);
177 buf1[0] = GSS_AUTH_P_NONE;
178 /* server decides if principal can log in as user */
179 strncpy (buf1 + 4, idata->conn->account.user, sizeof (buf1) - 4);
180 request_buf.value = buf1;
181 request_buf.length = 4 + m_strlen(idata->conn->account.user) + 1;
182 maj_stat = gss_wrap (&min_stat, context, 0, GSS_C_QOP_DEFAULT, &request_buf,
183 &cflags, &send_token);
184 if (maj_stat != GSS_S_COMPLETE) {
188 mutt_to_base64 ((unsigned char *) buf1, send_token.value, send_token.length,
190 m_strcat(buf1, sizeof(buf1), "\r\n");
191 mutt_socket_write (idata->conn, buf1);
193 /* Joy of victory or agony of defeat? */
195 rc = imap_cmd_step (idata);
196 while (rc == IMAP_CMD_CONTINUE);
197 if (rc == IMAP_CMD_RESPOND) {
200 if (imap_code (idata->cmd.buf)) {
201 /* flush the security context */
202 maj_stat = gss_delete_sec_context (&min_stat, &context, &send_token);
204 /* send_token may contain a notification to the server to flush
205 * credentials. RFC 1731 doesn't specify what to do, and since this
206 * support is only for authentication, we'll assume the server knows
207 * enough to flush its own credentials */
208 gss_release_buffer (&min_stat, &send_token);
210 return IMAP_AUTH_SUCCESS;
216 mutt_socket_write (idata->conn, "*\r\n");
218 rc = imap_cmd_step (idata);
219 while (rc == IMAP_CMD_CONTINUE);
222 mutt_error _("GSSAPI authentication failed.");
224 return IMAP_AUTH_FAILURE;