Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/auth/mech-winbind.c @ 6181:18f663e23c28 HEAD

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Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO mechanism. If auth_ntlm_use_winbind=yes it's also used for NTLM mechanism. Patch by Dmitry Butskoy.
author Timo Sirainen <tss@iki.fi>
date Mon, 06 Aug 2007 21:12:51 +0300
parents
children 593d2ab4df0d
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6181
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1 /*
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2 * NTLM and Negotiate authentication mechanisms,
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3 * using Samba winbind daemon
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4 *
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5 * Copyright (c) 2007 Dmitry Butskoy <dmitry@butskoy.name>
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6 *
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7 * This software is released under the MIT license.
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8 */
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9
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10 #include "common.h"
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11 #include "mech.h"
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12 #include "str.h"
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13 #include "buffer.h"
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14 #include "safe-memset.h"
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15 #include "base64.h"
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16 #include "istream.h"
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17 #include "ostream.h"
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18
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19 #include <stdlib.h>
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20 #include <unistd.h>
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21
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22 #define DEFAULT_WINBIND_HELPER "/usr/bin/ntlm_auth"
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23
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24 enum helper_result {
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25 HR_OK = 0, /* OK or continue */
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26 HR_FAIL = -1, /* authentication failed */
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27 HR_RESTART = -2 /* FAIL + try to restart helper */
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28 };
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29
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30 struct winbind_helper {
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31 const char *param;
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32 struct istream *in_pipe;
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33 struct ostream *out_pipe;
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34 };
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35
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36 struct winbind_auth_request {
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37 struct auth_request auth_request;
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38
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39 struct winbind_helper *winbind;
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40 bool continued;
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41 };
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42
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43 static struct winbind_helper winbind_ntlm_context = {
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44 "--helper-protocol=squid-2.5-ntlmssp", NULL, NULL
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45 };
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46 static struct winbind_helper winbind_spnego_context = {
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47 "--helper-protocol=gss-spnego", NULL, NULL
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48 };
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49
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50 static void winbind_helper_disconnect(struct winbind_helper *winbind)
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51 {
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52 if (winbind->in_pipe != NULL)
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53 i_stream_destroy(&winbind->in_pipe);
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54 if (winbind->out_pipe != NULL)
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55 o_stream_destroy(&winbind->out_pipe);
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56 }
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57
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58 static void winbind_helper_connect(struct winbind_helper *winbind)
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59 {
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60 int infd[2], outfd[2];
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61 pid_t pid;
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62
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63 i_assert(winbind->in_pipe == NULL);
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64
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65 if (pipe(infd) < 0) {
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66 i_error("pipe() failed: %m");
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67 return;
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68 }
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69 if (pipe(outfd) < 0) {
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70 (void)close(infd[0]); (void)close(infd[1]);
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71 return;
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72 }
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73
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74 pid = fork();
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75 if (pid < 0) {
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76 i_error("fork() failed: %m");
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77 (void)close(infd[0]); (void)close(infd[1]);
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78 (void)close(outfd[0]); (void)close(outfd[1]);
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79 return;
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80 }
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81
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82 if (pid == 0) {
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83 /* child */
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84 const char *helper_path, *args[3];
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85
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86 (void)close(infd[0]);
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87 (void)close(outfd[1]);
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88
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89 if (dup2(outfd[0], STDIN_FILENO) < 0 ||
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90 dup2(infd[1], STDOUT_FILENO) < 0)
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91 i_fatal("dup2() failed: %m");
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92
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93 helper_path = getenv("WINBIND_HELPER");
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94 if (helper_path == NULL)
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95 helper_path = DEFAULT_WINBIND_HELPER;
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96
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97 args[0] = helper_path;
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98 args[1] = winbind->param;
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99 args[2] = NULL;
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100 execv(args[0], (void *)args);
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101 i_fatal("execv(%s) failed: %m", args[0]);
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102 }
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103
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104 /* parent */
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105 (void)close(infd[1]);
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106 (void)close(outfd[0]);
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107
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108 winbind->in_pipe =
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109 i_stream_create_fd(infd[0], AUTH_CLIENT_MAX_LINE_LENGTH, TRUE);
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110 winbind->out_pipe =
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111 o_stream_create_fd(outfd[1], (size_t)-1, TRUE);
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112 }
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113
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114 static enum helper_result
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115 do_auth_continue(struct auth_request *auth_request,
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116 const unsigned char *data, size_t data_size)
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117 {
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118 struct winbind_auth_request *request =
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119 (struct winbind_auth_request *)auth_request;
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120 struct istream *in_pipe = request->winbind->in_pipe;
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121 string_t *str;
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diff changeset
122 char *answer;
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diff changeset
123 const char **token;
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diff changeset
124 bool gss_spnego = request->winbind == &winbind_spnego_context;
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diff changeset
125
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
126 if (request->winbind->in_pipe == NULL)
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diff changeset
127 return HR_RESTART;
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diff changeset
128
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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diff changeset
129 str = t_str_new(MAX_BASE64_ENCODED_SIZE(data_size + 1) + 4);
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diff changeset
130 str_printfa(str, "%s ", request->continued ? "KK" : "YR");
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diff changeset
131 base64_encode(data, data_size, str);
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diff changeset
132 str_append_c(str, '\n');
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diff changeset
133
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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diff changeset
134 if (o_stream_send_str(request->winbind->out_pipe, str_c(str)) < 0 ||
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diff changeset
135 o_stream_flush(request->winbind->out_pipe) < 0) {
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diff changeset
136 auth_request_log_error(auth_request, "winbind",
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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diff changeset
137 "write(out_pipe) failed: %m");
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diff changeset
138 return HR_RESTART;
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diff changeset
139 }
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diff changeset
140 request->continued = FALSE;
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diff changeset
141
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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diff changeset
142 while ((answer = i_stream_read_next_line(in_pipe)) == NULL) {
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diff changeset
143 if (in_pipe->stream_errno != 0)
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diff changeset
144 break;
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diff changeset
145 }
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diff changeset
146 if (answer == NULL) {
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diff changeset
147 auth_request_log_error(auth_request, "winbind",
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148 "read(in_pipe) failed: %m");
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149 return HR_RESTART;
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150 }
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diff changeset
151
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diff changeset
152 token = t_strsplit_spaces(answer, " ");
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153 if (token[0] == NULL ||
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diff changeset
154 (token[1] == NULL && strcmp(token[0], "BH") != 0) ||
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diff changeset
155 (token[2] == NULL && gss_spnego)) {
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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diff changeset
156 auth_request_log_error(auth_request, "winbind",
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diff changeset
157 "Invalid input from helper: %s", answer);
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158 return HR_RESTART;
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diff changeset
159 }
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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diff changeset
160
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
161 /*
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162 * NTLM:
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diff changeset
163 * The child's reply contains 2 parts:
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164 * - The code: TT, AF or NA
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165 * - The argument:
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diff changeset
166 * For TT it's the blob to send to the client, coded in base64
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167 * For AF it's user or DOMAIN\user
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168 * For NA it's the NT error code
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169 *
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diff changeset
170 * GSS-SPNEGO:
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diff changeset
171 * The child's reply contains 3 parts:
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diff changeset
172 * - The code: TT, AF or NA
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diff changeset
173 * - The blob to send to the client, coded in base64
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diff changeset
174 * - The argument:
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diff changeset
175 * For TT it's a dummy '*'
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diff changeset
176 * For AF it's DOMAIN\user
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diff changeset
177 * For NA it's the NT error code
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diff changeset
178 */
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diff changeset
179
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diff changeset
180 if (strcmp(token[0], "TT") == 0) {
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diff changeset
181 buffer_t *buf;
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diff changeset
182
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diff changeset
183 buf = t_base64_decode_str(token[1]);
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diff changeset
184 auth_request->callback(auth_request,
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diff changeset
185 AUTH_CLIENT_RESULT_CONTINUE,
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diff changeset
186 buf->data, buf->used);
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diff changeset
187 request->continued = TRUE;
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diff changeset
188 return HR_OK;
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diff changeset
189 } else if (strcmp(token[0], "NA") == 0) {
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diff changeset
190 const char *error = gss_spnego ? token[2] : token[1];
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diff changeset
191
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diff changeset
192 auth_request_log_info(auth_request, "winbind",
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diff changeset
193 "user not authenticated: %s", error);
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diff changeset
194 return HR_FAIL;
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diff changeset
195 } else if (strcmp(token[0], "AF") == 0) {
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diff changeset
196 const char *user, *p, *error;
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diff changeset
197
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parents:
diff changeset
198 user = gss_spnego ? token[2] : token[1];
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diff changeset
199
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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diff changeset
200 p = strchr(user, '\\');
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parents:
diff changeset
201 if (p != NULL) {
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parents:
diff changeset
202 /* change "DOMAIN\user" to uniform style
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parents:
diff changeset
203 "user@DOMAIN" */
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parents:
diff changeset
204 user = t_strconcat(p+1, "@",
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parents:
diff changeset
205 t_strdup_until(user, p), NULL);
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parents:
diff changeset
206 }
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
207
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
208 if (!auth_request_set_username(auth_request, user, &error)) {
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
209 auth_request_log_info(auth_request, "winbind",
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
210 "%s", error);
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Timo Sirainen <tss@iki.fi>
parents:
diff changeset
211 return HR_FAIL;
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
212 }
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
213
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
214 if (gss_spnego && strcmp(token[1], "*") != 0) {
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
215 buffer_t *buf;
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
216
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
217 buf = t_base64_decode_str(token[1]);
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
218 auth_request_success(&request->auth_request,
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
219 buf->data, buf->used);
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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diff changeset
220 } else {
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
221 auth_request_success(&request->auth_request, NULL, 0);
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parents:
diff changeset
222 }
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
223 return HR_OK;
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
224 } else if (strcmp(token[0], "BH") == 0) {
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
225 auth_request_log_info(auth_request, "winbind",
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
226 "ntlm_auth reports broken helper: %s",
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parents:
diff changeset
227 token[1] != NULL ? token[1] : "");
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diff changeset
228 return HR_RESTART;
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parents:
diff changeset
229 } else {
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
230 auth_request_log_error(auth_request, "winbind",
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
231 "Invalid input from helper: %s", answer);
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parents:
diff changeset
232 return HR_RESTART;
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
233 }
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
234 }
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
235
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
236 static void
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
237 mech_winbind_auth_continue(struct auth_request *auth_request,
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
238 const unsigned char *data, size_t data_size)
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parents:
diff changeset
239 {
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
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parents:
diff changeset
240 struct winbind_auth_request *request =
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parents:
diff changeset
241 (struct winbind_auth_request *)auth_request;
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parents:
diff changeset
242 enum helper_result res;
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
243
18f663e23c28 Added support for Samba's ntlm_auth helper. It's used for GSS-SPNEGO
Timo Sirainen <tss@iki.fi>
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244 res = do_auth_continue(auth_request, data, data_size);
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245 if (res != HR_OK) {
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246 if (res == HR_RESTART)
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247 winbind_helper_disconnect(request->winbind);
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248 auth_request_fail(auth_request);
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249 }
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250 }
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251
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252 static struct auth_request *do_auth_new(struct winbind_helper *winbind)
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253 {
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254 struct winbind_auth_request *request;
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255 pool_t pool;
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256
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257 pool = pool_alloconly_create("winbind_auth_request", 1024);
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258 request = p_new(pool, struct winbind_auth_request, 1);
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259 request->auth_request.pool = pool;
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260
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261 request->winbind = winbind;
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262 winbind_helper_connect(request->winbind);
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263 return &request->auth_request;
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264 }
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265
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266 static struct auth_request *mech_winbind_ntlm_auth_new(void)
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267 {
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268 return do_auth_new(&winbind_ntlm_context);
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269 }
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270
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271 static struct auth_request *mech_winbind_spnego_auth_new(void)
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272 {
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273 return do_auth_new(&winbind_spnego_context);
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274 }
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275
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276 const struct mech_module mech_winbind_ntlm = {
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277 "NTLM",
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278
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279 MEMBER(flags) MECH_SEC_DICTIONARY | MECH_SEC_ACTIVE,
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280
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281 MEMBER(passdb_need_plain) FALSE,
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282 MEMBER(passdb_need_credentials) FALSE,
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283 MEMBER(passdb_need_set_credentials) FALSE,
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284
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285 mech_winbind_ntlm_auth_new,
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286 mech_generic_auth_initial,
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287 mech_winbind_auth_continue,
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288 mech_generic_auth_free
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289 };
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290
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291 const struct mech_module mech_winbind_spnego = {
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292 "GSS-SPNEGO",
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293
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294 MEMBER(flags) 0,
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295
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296 MEMBER(passdb_need_plain) FALSE,
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297 MEMBER(passdb_need_credentials) FALSE,
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298 MEMBER(passdb_need_set_credentials) FALSE,
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299
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300 mech_winbind_spnego_auth_new,
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301 mech_generic_auth_initial,
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302 mech_winbind_auth_continue,
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303 mech_generic_auth_free
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304 };