Mercurial > dovecot > core-2.2

annotate src/director/login-connection.c @ 18666:e178413a905d

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director: Added a new DIRECTOR-LOOKUP command that auth connections can use. The parameters are the same as what auth lookup would receive from auth process. So the idea is that a proxy could do an auth lookup, then forward the reply to director, which would return back the updated reply with the host field added.
author Timo Sirainen <tss@iki.fi>
date Wed, 13 May 2015 05:25:31 +0300
parents 333533e2d231
children 67fdd6f962f5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
18137
3009a1a6f6d5 global: freshen copyright
Phil Carmody <phil@dovecot.fi>
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1 /* Copyright (c) 2010-2015 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "ioloop.h"
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5 #include "net.h"
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6 #include "istream.h"
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7 #include "ostream.h"
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8 #include "llist.h"
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9 #include "str.h"
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10 #include "master-service.h"
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11 #include "director.h"
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12 #include "director-request.h"
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13 #include "auth-connection.h"
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14 #include "login-connection.h"
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15
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16 #include <unistd.h>
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17
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18 struct login_connection {
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19 struct login_connection *prev, *next;
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20
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21 int refcount;
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22
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23 int fd;
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24 struct io *io;
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25 struct istream *input;
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26 struct ostream *output;
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27 struct auth_connection *auth;
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28 struct director *dir;
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29
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30 unsigned int destroyed:1;
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31 unsigned int userdb:1;
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32 unsigned int input_newline:1;
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33 };
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34
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35 struct login_host_request {
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36 struct login_connection *conn;
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37 char *line, *username;
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38
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39 struct ip_addr local_ip;
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40 unsigned int local_port;
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41 unsigned int dest_port;
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42 bool director_proxy_maybe;
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43 };
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44
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45 static struct login_connection *login_connections;
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46
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47 static void auth_input_line(const char *line, void *context);
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48 static void login_connection_unref(struct login_connection **_conn);
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49
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50 static void
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51 login_connection_director_lookup(struct login_connection *conn,
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52 const unsigned char *data, size_t size)
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53 {
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54 T_BEGIN {
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55 string_t *line = t_str_new(128);
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56 str_append(line, "OK\t");
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57 str_append_n(line, data, size);
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58 auth_input_line(str_c(line), conn);
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59 } T_END;
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60 }
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61
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62 static void login_connection_input(struct login_connection *conn)
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63 {
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64 const unsigned char *data, *p;
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65 size_t size;
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66 struct ostream *auth_output;
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67
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68 auth_output = auth_connection_send(conn->auth);
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69 switch (i_stream_read(conn->input)) {
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70 case -2:
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71 data = i_stream_get_data(conn->input, &size);
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72 o_stream_nsend(auth_output, data, size);
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73 i_stream_skip(conn->input, size);
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74 conn->input_newline = FALSE;
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75 return;
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76 case -1:
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77 if (conn->input->stream_errno != 0 &&
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78 conn->input->stream_errno != ECONNRESET) {
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79 i_error("read(login connection) failed: %s",
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80 i_stream_get_error(conn->input));
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81 }
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82 login_connection_deinit(&conn);
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83 return;
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84 case 0:
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85 return;
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86 default:
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87 break;
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88 }
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89
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90 o_stream_cork(auth_output);
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91 data = i_stream_get_data(conn->input, &size);
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92 while ((p = memchr(data, '\n', size)) != NULL) {
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93 size_t linelen = p-data;
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94
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95 if (!conn->input_newline || linelen <= 16 ||
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96 memcmp(data, "DIRECTOR-LOOKUP\t", 16) != 0) {
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97 /* forward data to auth process */
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98 o_stream_nsend(auth_output, data, linelen+1);
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99 conn->input_newline = TRUE;
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100 } else {
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101 login_connection_director_lookup(conn, data+16, linelen-16);
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102 }
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103 i_stream_skip(conn->input, linelen+1);
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104 data = i_stream_get_data(conn->input, &size);
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105 }
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106 o_stream_uncork(auth_output);
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107 }
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108
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109 static void
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110 login_connection_send_line(struct login_connection *conn, const char *line)
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111 {
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112 struct const_iovec iov[2];
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113
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114 if (conn->destroyed)
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115 return;
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116
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117 iov[0].iov_base = line;
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118 iov[0].iov_len = strlen(line);
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119 iov[1].iov_base = "\n";
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120 iov[1].iov_len = 1;
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121 o_stream_nsendv(conn->output, iov, N_ELEMENTS(iov));
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122 }
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123
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124 static bool login_host_request_is_self(struct login_host_request *request,
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125 const struct ip_addr *dest_ip)
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126 {
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127 if (!net_ip_compare(dest_ip, &request->local_ip))
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128 return FALSE;
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129 if (request->dest_port != 0 && request->local_port != 0 &&
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130 request->dest_port != request->local_port)
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diff changeset
131 return FALSE;
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
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diff changeset
132 return TRUE;
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
133 }
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
134
13921
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diff changeset
135 static void
c70965e8b27d director: If request is timed out, log an error.
Timo Sirainen <tss@iki.fi>
parents: 12782
diff changeset
136 login_host_callback(const struct ip_addr *ip, const char *errormsg,
c70965e8b27d director: If request is timed out, log an error.
Timo Sirainen <tss@iki.fi>
parents: 12782
diff changeset
137 void *context)
11321
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138 {
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
139 struct login_host_request *request = context;
11325
2a5336ad86cd director: Tell login proxy to notify director of open connections every director_user_expire/2 secs.
Timo Sirainen <tss@iki.fi>
parents: 11321
diff changeset
140 struct director *dir = request->conn->dir;
16785
b135d723acf3 director: Don't assert-crash if PASS lookup fails.
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parents: 16614
diff changeset
141 const char *line, *line_params;
11325
2a5336ad86cd director: Tell login proxy to notify director of open connections every director_user_expire/2 secs.
Timo Sirainen <tss@iki.fi>
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diff changeset
142 unsigned int secs;
11321
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diff changeset
143
18498
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diff changeset
144 if (ip == NULL) {
16785
b135d723acf3 director: Don't assert-crash if PASS lookup fails.
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parents: 16614
diff changeset
145 if (strncmp(request->line, "OK\t", 3) == 0)
b135d723acf3 director: Don't assert-crash if PASS lookup fails.
Timo Sirainen <tss@iki.fi>
parents: 16614
diff changeset
146 line_params = request->line + 3;
b135d723acf3 director: Don't assert-crash if PASS lookup fails.
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parents: 16614
diff changeset
147 else if (strncmp(request->line, "PASS\t", 5) == 0)
b135d723acf3 director: Don't assert-crash if PASS lookup fails.
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diff changeset
148 line_params = request->line + 5;
b135d723acf3 director: Don't assert-crash if PASS lookup fails.
Timo Sirainen <tss@iki.fi>
parents: 16614
diff changeset
149 else
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Timo Sirainen <tss@iki.fi>
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diff changeset
150 i_panic("BUG: Unexpected line: %s", request->line);
13921
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diff changeset
151
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diff changeset
152 i_error("director: User %s host lookup failed: %s",
c70965e8b27d director: If request is timed out, log an error.
Timo Sirainen <tss@iki.fi>
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diff changeset
153 request->username, errormsg);
16785
b135d723acf3 director: Don't assert-crash if PASS lookup fails.
Timo Sirainen <tss@iki.fi>
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diff changeset
154 line = t_strconcat("FAIL\t", t_strcut(line_params, '\t'),
13921
c70965e8b27d director: If request is timed out, log an error.
Timo Sirainen <tss@iki.fi>
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diff changeset
155 "\ttemp", NULL);
18498
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Timo Sirainen <tss@iki.fi>
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diff changeset
156 } else if (request->director_proxy_maybe &&
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diff changeset
157 login_host_request_is_self(request, ip)) {
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diff changeset
158 line = request->line;
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diff changeset
159 } else {
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diff changeset
160 secs = dir->set->director_user_expire / 2;
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parents: 18137
diff changeset
161 line = t_strdup_printf("%s\thost=%s\tproxy_refresh=%u",
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
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diff changeset
162 request->line, net_ip2addr(ip), secs);
13921
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diff changeset
163 }
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Timo Sirainen <tss@iki.fi>
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diff changeset
164 login_connection_send_line(request->conn, line);
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165
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166 login_connection_unref(&request->conn);
13921
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diff changeset
167 i_free(request->username);
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diff changeset
168 i_free(request->line);
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
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diff changeset
169 i_free(request);
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170 }
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
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diff changeset
171
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
172 static void auth_input_line(const char *line, void *context)
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
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diff changeset
173 {
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
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diff changeset
174 struct login_connection *conn = context;
18498
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diff changeset
175 struct login_host_request *request, temp_request;
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176 const char *const *args, *line_params, *username = NULL, *tag = "";
11321
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177 bool proxy = FALSE, host = FALSE;
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178
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179 if (line == NULL) {
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180 /* auth connection died -> kill also this login connection */
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diff changeset
181 login_connection_deinit(&conn);
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182 return;
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183 }
11714
1683324ac632 director: Added support for LMTP proxying.
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diff changeset
184 if (!conn->userdb && strncmp(line, "OK\t", 3) == 0)
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diff changeset
185 line_params = line + 3;
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Timo Sirainen <tss@iki.fi>
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diff changeset
186 else if (conn->userdb && strncmp(line, "PASS\t", 5) == 0)
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diff changeset
187 line_params = line + 5;
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diff changeset
188 else {
11321
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189 login_connection_send_line(conn, line);
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diff changeset
190 return;
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diff changeset
191 }
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
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diff changeset
192
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
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diff changeset
193 /* OK <id> [<parameters>] */
14471
fc8031c5e691 Use t_strsplit_tab() wherever possible
Timo Sirainen <tss@iki.fi>
parents: 14133
diff changeset
194 args = t_strsplit_tab(line_params);
11321
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diff changeset
195 if (*args != NULL) {
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diff changeset
196 /* we should always get here, but in case we don't just
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diff changeset
197 forward as-is and let login process handle the error. */
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diff changeset
198 args++;
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199 }
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
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diff changeset
200
18498
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diff changeset
201 memset(&temp_request, 0, sizeof(temp_request));
11321
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parents:
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202 for (; *args != NULL; args++) {
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
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diff changeset
203 if (strncmp(*args, "proxy", 5) == 0 &&
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
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diff changeset
204 ((*args)[5] == '=' || (*args)[5] == '\0'))
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diff changeset
205 proxy = TRUE;
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
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parents:
diff changeset
206 else if (strncmp(*args, "host=", 5) == 0)
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
207 host = TRUE;
18498
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
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diff changeset
208 else if (strncmp(*args, "lip=", 4) == 0) {
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
209 if (net_addr2ip((*args) + 4, &temp_request.local_ip) < 0)
18503
333533e2d231 director: Log error if auth sends invalid lip/lport/port parameter.
Timo Sirainen <tss@iki.fi>
parents: 18498
diff changeset
210 i_error("auth sent invalid lip field: %s", (*args) + 6);
18498
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
211 } else if (strncmp(*args, "lport=", 6) == 0) {
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
212 if (str_to_uint((*args) + 6, &temp_request.local_port) < 0)
18503
333533e2d231 director: Log error if auth sends invalid lip/lport/port parameter.
Timo Sirainen <tss@iki.fi>
parents: 18498
diff changeset
213 i_error("auth sent invalid lport field: %s", (*args) + 6);
18498
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
214 } else if (strncmp(*args, "port=", 5) == 0) {
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
215 if (str_to_uint((*args) + 5, &temp_request.dest_port) < 0)
18503
333533e2d231 director: Log error if auth sends invalid lip/lport/port parameter.
Timo Sirainen <tss@iki.fi>
parents: 18498
diff changeset
216 i_error("auth sent invalid port field: %s", (*args) + 6);
18498
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
217 } else if (strncmp(*args, "destuser=", 9) == 0)
11321
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Timo Sirainen <tss@iki.fi>
parents:
diff changeset
218 username = *args + 9;
18067
a7e830b9b967 director: Added support for backend cluster "tags".
Timo Sirainen <tss@iki.fi>
parents: 17467
diff changeset
219 else if (strncmp(*args, "director_tag=", 13) == 0)
a7e830b9b967 director: Added support for backend cluster "tags".
Timo Sirainen <tss@iki.fi>
parents: 17467
diff changeset
220 tag = *args + 13;
18498
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
221 else if (strncmp(*args, "director_proxy_maybe", 20) == 0 &&
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
222 ((*args)[20] == '=' || (*args)[20] == '\0'))
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
223 temp_request.director_proxy_maybe = TRUE;
11321
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parents:
diff changeset
224 else if (strncmp(*args, "user=", 5) == 0) {
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
225 if (username == NULL)
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
226 username = *args + 5;
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
227 }
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
228 }
18498
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
229 if ((!proxy && !temp_request.director_proxy_maybe) ||
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
230 host || username == NULL) {
17467
899cf87a687c director: Fixed crash if master_user_separator is set, but we didn't do a proxy lookup.
Timo Sirainen <tss@iki.fi>
parents: 17130
diff changeset
231 login_connection_send_line(conn, line);
899cf87a687c director: Fixed crash if master_user_separator is set, but we didn't do a proxy lookup.
Timo Sirainen <tss@iki.fi>
parents: 17130
diff changeset
232 return;
899cf87a687c director: Fixed crash if master_user_separator is set, but we didn't do a proxy lookup.
Timo Sirainen <tss@iki.fi>
parents: 17130
diff changeset
233 }
11321
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Timo Sirainen <tss@iki.fi>
parents:
diff changeset
234 if (*conn->dir->set->master_user_separator != '\0') {
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
235 /* with master user logins we still want to use only the
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
236 login username */
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
237 username = t_strcut(username,
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
238 *conn->dir->set->master_user_separator);
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
239 }
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
240
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
241 /* we need to add the host. the lookup might be asynchronous */
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
242 request = i_new(struct login_host_request, 1);
18498
c5cdf42e398a director: Implemented director_proxy_maybe passdb extra field.
Timo Sirainen <tss@iki.fi>
parents: 18137
diff changeset
243 *request = temp_request;
11321
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
244 request->conn = conn;
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
245 request->line = i_strdup(line);
13921
c70965e8b27d director: If request is timed out, log an error.
Timo Sirainen <tss@iki.fi>
parents: 12782
diff changeset
246 request->username = i_strdup(username);
11321
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
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parents:
diff changeset
247
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
248 conn->refcount++;
18067
a7e830b9b967 director: Added support for backend cluster "tags".
Timo Sirainen <tss@iki.fi>
parents: 17467
diff changeset
249 director_request(conn->dir, username, tag, login_host_callback, request);
11321
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
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parents:
diff changeset
250 }
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
251
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
252 struct login_connection *
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
253 login_connection_init(struct director *dir, int fd,
11714
1683324ac632 director: Added support for LMTP proxying.
Timo Sirainen <tss@iki.fi>
parents: 11430
diff changeset
254 struct auth_connection *auth, bool userdb)
11321
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
255 {
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
256 struct login_connection *conn;
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
257
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
258 conn = i_new(struct login_connection, 1);
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
259 conn->refcount = 1;
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
260 conn->fd = fd;
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
261 conn->auth = auth;
5f350b5ff6d9 Added initial implementation of a director process (for NFS users).
Timo Sirainen <tss@iki.fi>
parents:
diff changeset
262 conn->dir = dir;
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263 conn->input = i_stream_create_fd(conn->fd, IO_BLOCK_SIZE, FALSE);
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264 conn->output = o_stream_create_fd(conn->fd, (size_t)-1, FALSE);
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265 o_stream_set_no_error_handling(conn->output, TRUE);
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266 conn->io = io_add(conn->fd, IO_READ, login_connection_input, conn);
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267 conn->userdb = userdb;
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268 conn->input_newline = TRUE;
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269
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270 auth_connection_set_callback(conn->auth, auth_input_line, conn);
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271 DLLIST_PREPEND(&login_connections, conn);
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272 return conn;
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273 }
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274
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275 void login_connection_deinit(struct login_connection **_conn)
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276 {
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277 struct login_connection *conn = *_conn;
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278
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279 *_conn = NULL;
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280
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281 if (conn->destroyed)
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282 return;
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283 conn->destroyed = TRUE;
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284
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285 DLLIST_REMOVE(&login_connections, conn);
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286 io_remove(&conn->io);
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287 i_stream_destroy(&conn->input);
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288 o_stream_destroy(&conn->output);
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289 if (close(conn->fd) < 0)
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290 i_error("close(login connection) failed: %m");
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291 conn->fd = -1;
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292
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293 auth_connection_deinit(&conn->auth);
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294 login_connection_unref(&conn);
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295
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296 master_service_client_connection_destroyed(master_service);
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297 }
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298
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299 static void login_connection_unref(struct login_connection **_conn)
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300 {
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301 struct login_connection *conn = *_conn;
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302
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303 *_conn = NULL;
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304
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305 i_assert(conn->refcount > 0);
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306 if (--conn->refcount == 0)
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307 i_free(conn);
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308 }
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309
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310 void login_connections_deinit(void)
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311 {
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312 while (login_connections != NULL) {
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313 struct login_connection *conn = login_connections;
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314
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315 login_connection_deinit(&conn);
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316 }
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317 }