1 | /***************************************************************************\ |
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2 | * * |
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3 | * BitlBee - An IRC to IM gateway * |
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4 | * Jabber module - I/O stuff (plain, SSL), queues, etc * |
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5 | * * |
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6 | * Copyright 2006-2012 Wilmer van der Gaast <wilmer@gaast.net> * |
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7 | * * |
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8 | * This program is free software; you can redistribute it and/or modify * |
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9 | * it under the terms of the GNU General Public License as published by * |
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10 | * the Free Software Foundation; either version 2 of the License, or * |
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11 | * (at your option) any later version. * |
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12 | * * |
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13 | * This program is distributed in the hope that it will be useful, * |
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14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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16 | * GNU General Public License for more details. * |
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17 | * * |
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18 | * You should have received a copy of the GNU General Public License along * |
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19 | * with this program; if not, write to the Free Software Foundation, Inc., * |
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20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. * |
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21 | * * |
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22 | \***************************************************************************/ |
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23 | |
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24 | #include "jabber.h" |
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25 | #include "lib/ssl_client.h" |
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26 | |
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27 | static gboolean jabber_write_callback(gpointer data, gint fd, b_input_condition cond); |
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28 | static gboolean jabber_write_queue(struct im_connection *ic); |
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29 | |
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30 | int jabber_write_packet(struct im_connection *ic, struct xt_node *node) |
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31 | { |
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32 | char *buf; |
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33 | int st; |
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34 | |
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35 | buf = xt_to_string(node); |
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36 | st = jabber_write(ic, buf, strlen(buf)); |
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37 | g_free(buf); |
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38 | |
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39 | return st; |
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40 | } |
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41 | |
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42 | int jabber_write(struct im_connection *ic, char *buf, int len) |
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43 | { |
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44 | struct jabber_data *jd = ic->proto_data; |
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45 | gboolean ret; |
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46 | |
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47 | if (jd->flags & JFLAG_XMLCONSOLE && !(ic->flags & OPT_LOGGING_OUT)) { |
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48 | char *msg, *s; |
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49 | |
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50 | msg = g_strdup_printf("TX: %s", buf); |
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51 | /* Don't include auth info in XML logs. */ |
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52 | if (strncmp(msg, "TX: <auth ", 10) == 0 && (s = strchr(msg, '>'))) { |
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53 | s++; |
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54 | while (*s && *s != '<') { |
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55 | *(s++) = '*'; |
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56 | } |
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57 | } |
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58 | imcb_buddy_msg(ic, JABBER_XMLCONSOLE_HANDLE, msg, 0, 0); |
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59 | g_free(msg); |
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60 | } |
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61 | |
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62 | if (jd->tx_len == 0) { |
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63 | /* If the queue is empty, allocate a new buffer. */ |
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64 | jd->tx_len = len; |
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65 | jd->txq = g_memdup(buf, len); |
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66 | |
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67 | /* Try if we can write it immediately so we don't have to do |
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68 | it via the event handler. If not, add the handler. (In |
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69 | most cases it probably won't be necessary.) */ |
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70 | if ((ret = jabber_write_queue(ic)) && jd->tx_len > 0) { |
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71 | jd->w_inpa = b_input_add(jd->fd, B_EV_IO_WRITE, jabber_write_callback, ic); |
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72 | } |
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73 | } else { |
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74 | /* Just add it to the buffer if it's already filled. The |
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75 | event handler is already set. */ |
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76 | jd->txq = g_renew(char, jd->txq, jd->tx_len + len); |
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77 | memcpy(jd->txq + jd->tx_len, buf, len); |
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78 | jd->tx_len += len; |
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79 | |
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80 | /* The return value for write() doesn't necessarily mean |
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81 | that everything got sent, it mainly means that the |
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82 | connection (officially) still exists and can still |
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83 | be accessed without hitting SIGSEGV. IOW: */ |
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84 | ret = TRUE; |
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85 | } |
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86 | |
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87 | return ret; |
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88 | } |
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89 | |
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90 | /* Splitting up in two separate functions: One to use as a callback and one |
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91 | to use in the function above to escape from having to wait for the event |
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92 | handler to call us, if possible. |
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93 | |
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94 | Two different functions are necessary because of the return values: The |
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95 | callback should only return TRUE if the write was successful AND if the |
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96 | buffer is not empty yet (ie. if the handler has to be called again when |
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97 | the socket is ready for more data). */ |
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98 | static gboolean jabber_write_callback(gpointer data, gint fd, b_input_condition cond) |
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99 | { |
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100 | struct jabber_data *jd = ((struct im_connection *) data)->proto_data; |
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101 | |
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102 | return jd->fd != -1 && |
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103 | jabber_write_queue(data) && |
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104 | jd->tx_len > 0; |
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105 | } |
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106 | |
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107 | static gboolean jabber_write_queue(struct im_connection *ic) |
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108 | { |
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109 | struct jabber_data *jd = ic->proto_data; |
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110 | int st; |
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111 | |
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112 | if (jd->ssl) { |
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113 | st = ssl_write(jd->ssl, jd->txq, jd->tx_len); |
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114 | } else { |
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115 | st = write(jd->fd, jd->txq, jd->tx_len); |
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116 | } |
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117 | |
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118 | if (st == jd->tx_len) { |
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119 | /* We wrote everything, clear the buffer. */ |
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120 | g_free(jd->txq); |
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121 | jd->txq = NULL; |
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122 | jd->tx_len = 0; |
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123 | |
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124 | return TRUE; |
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125 | } else if (st == 0 || (st < 0 && !ssl_sockerr_again(jd->ssl))) { |
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126 | /* Set fd to -1 to make sure we won't write to it anymore. */ |
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127 | closesocket(jd->fd); /* Shouldn't be necessary after errors? */ |
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128 | jd->fd = -1; |
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129 | |
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130 | imcb_error(ic, "Short write() to server"); |
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131 | imc_logout(ic, TRUE); |
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132 | return FALSE; |
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133 | } else if (st > 0) { |
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134 | char *s; |
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135 | |
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136 | s = g_memdup(jd->txq + st, jd->tx_len - st); |
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137 | jd->tx_len -= st; |
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138 | g_free(jd->txq); |
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139 | jd->txq = s; |
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140 | |
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141 | return TRUE; |
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142 | } else { |
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143 | /* Just in case we had EINPROGRESS/EAGAIN: */ |
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144 | |
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145 | return TRUE; |
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146 | } |
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147 | } |
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148 | |
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149 | static gboolean jabber_read_callback(gpointer data, gint fd, b_input_condition cond) |
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150 | { |
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151 | struct im_connection *ic = data; |
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152 | struct jabber_data *jd = ic->proto_data; |
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153 | char buf[512]; |
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154 | int st; |
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155 | |
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156 | if (jd->fd == -1) { |
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157 | return FALSE; |
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158 | } |
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159 | |
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160 | if (jd->ssl) { |
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161 | st = ssl_read(jd->ssl, buf, sizeof(buf)); |
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162 | } else { |
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163 | st = read(jd->fd, buf, sizeof(buf)); |
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164 | } |
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165 | |
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166 | if (st > 0) { |
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167 | /* Parse. */ |
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168 | if (xt_feed(jd->xt, buf, st) < 0) { |
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169 | imcb_error(ic, "XML stream error"); |
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170 | imc_logout(ic, TRUE); |
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171 | return FALSE; |
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172 | } |
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173 | |
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174 | /* Execute all handlers. */ |
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175 | if (!xt_handle(jd->xt, NULL, 1)) { |
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176 | /* Don't do anything, the handlers should have |
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177 | aborted the connection already. */ |
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178 | return FALSE; |
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179 | } |
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180 | |
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181 | if (jd->flags & JFLAG_STREAM_RESTART) { |
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182 | jd->flags &= ~JFLAG_STREAM_RESTART; |
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183 | jabber_start_stream(ic); |
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184 | } |
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185 | |
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186 | /* Garbage collection. */ |
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187 | xt_cleanup(jd->xt, NULL, 1); |
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188 | |
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189 | /* This is a bit hackish, unfortunately. Although xmltree |
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190 | has nifty event handler stuff, it only calls handlers |
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191 | when nodes are complete. Since the server should only |
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192 | send an opening <stream:stream> tag, we have to check |
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193 | this by hand. :-( */ |
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194 | if (!(jd->flags & JFLAG_STREAM_STARTED) && jd->xt && jd->xt->root) { |
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195 | if (g_strcasecmp(jd->xt->root->name, "stream:stream") == 0) { |
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196 | jd->flags |= JFLAG_STREAM_STARTED; |
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197 | |
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198 | /* If there's no version attribute, assume |
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199 | this is an old server that can't do SASL |
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200 | authentication. */ |
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201 | if (!set_getbool(&ic->acc->set, "sasl") || !sasl_supported(ic)) { |
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202 | /* If there's no version= tag, we suppose |
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203 | this server does NOT implement: XMPP 1.0, |
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204 | SASL and TLS. */ |
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205 | if (set_getbool(&ic->acc->set, "tls")) { |
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206 | imcb_error(ic, "TLS is turned on for this " |
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207 | "account, but is not supported by this server"); |
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208 | imc_logout(ic, FALSE); |
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209 | return FALSE; |
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210 | } else { |
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211 | return jabber_init_iq_auth(ic); |
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212 | } |
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213 | } |
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214 | } else { |
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215 | imcb_error(ic, "XML stream error"); |
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216 | imc_logout(ic, TRUE); |
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217 | return FALSE; |
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218 | } |
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219 | } |
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220 | } else if (st == 0 || (st < 0 && !ssl_sockerr_again(jd->ssl))) { |
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221 | closesocket(jd->fd); |
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222 | jd->fd = -1; |
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223 | |
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224 | imcb_error(ic, "Error while reading from server"); |
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225 | imc_logout(ic, TRUE); |
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226 | return FALSE; |
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227 | } |
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228 | |
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229 | if (ssl_pending(jd->ssl)) { |
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230 | /* OpenSSL empties the TCP buffers completely but may keep some |
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231 | data in its internap buffers. select() won't see that, but |
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232 | ssl_pending() does. */ |
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233 | return jabber_read_callback(data, fd, cond); |
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234 | } else { |
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235 | return TRUE; |
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236 | } |
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237 | } |
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238 | |
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239 | gboolean jabber_connected_plain(gpointer data, gint source, b_input_condition cond) |
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240 | { |
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241 | struct im_connection *ic = data; |
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242 | |
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243 | if (g_slist_find(jabber_connections, ic) == NULL) { |
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244 | return FALSE; |
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245 | } |
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246 | |
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247 | if (source == -1) { |
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248 | imcb_error(ic, "Could not connect to server"); |
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249 | imc_logout(ic, TRUE); |
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250 | return FALSE; |
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251 | } |
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252 | |
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253 | imcb_log(ic, "Connected to server, logging in"); |
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254 | |
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255 | return jabber_start_stream(ic); |
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256 | } |
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257 | |
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258 | gboolean jabber_connected_ssl(gpointer data, int returncode, void *source, b_input_condition cond) |
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259 | { |
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260 | struct im_connection *ic = data; |
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261 | struct jabber_data *jd; |
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262 | |
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263 | if (g_slist_find(jabber_connections, ic) == NULL) { |
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264 | return FALSE; |
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265 | } |
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266 | |
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267 | jd = ic->proto_data; |
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268 | |
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269 | if (source == NULL) { |
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270 | /* The SSL connection will be cleaned up by the SSL lib |
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271 | already, set it to NULL here to prevent a double cleanup: */ |
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272 | jd->ssl = NULL; |
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273 | |
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274 | if (returncode != 0) { |
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275 | char *err = ssl_verify_strerror(returncode); |
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276 | imcb_error(ic, "Certificate verification problem 0x%x: %s", |
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277 | returncode, err ? err : "Unknown"); |
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278 | g_free(err); |
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279 | imc_logout(ic, FALSE); |
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280 | } else { |
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281 | imcb_error(ic, "Could not connect to server"); |
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282 | imc_logout(ic, TRUE); |
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283 | } |
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284 | |
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285 | return FALSE; |
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286 | } |
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287 | |
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288 | imcb_log(ic, "Connected to server, logging in"); |
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289 | |
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290 | return jabber_start_stream(ic); |
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291 | } |
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292 | |
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293 | static xt_status jabber_end_of_stream(struct xt_node *node, gpointer data) |
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294 | { |
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295 | imc_logout(data, TRUE); |
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296 | return XT_ABORT; |
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297 | } |
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298 | |
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299 | static xt_status jabber_pkt_features(struct xt_node *node, gpointer data) |
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300 | { |
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301 | struct im_connection *ic = data; |
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302 | struct jabber_data *jd = ic->proto_data; |
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303 | struct xt_node *c, *reply; |
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304 | int trytls; |
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305 | |
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306 | trytls = g_strcasecmp(set_getstr(&ic->acc->set, "tls"), "try") == 0; |
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307 | c = xt_find_node(node->children, "starttls"); |
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308 | if (c && !jd->ssl) { |
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309 | /* If the server advertises the STARTTLS feature and if we're |
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310 | not in a secure connection already: */ |
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311 | |
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312 | c = xt_find_node(c->children, "required"); |
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313 | |
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314 | if (c && (!trytls && !set_getbool(&ic->acc->set, "tls"))) { |
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315 | imcb_error(ic, "Server requires TLS connections, but TLS is turned off for this account"); |
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316 | imc_logout(ic, FALSE); |
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317 | |
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318 | return XT_ABORT; |
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319 | } |
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320 | |
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321 | /* Only run this if the tls setting is set to true or try: */ |
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322 | if ((trytls || set_getbool(&ic->acc->set, "tls"))) { |
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323 | reply = xt_new_node("starttls", NULL, NULL); |
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324 | xt_add_attr(reply, "xmlns", XMLNS_TLS); |
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325 | if (!jabber_write_packet(ic, reply)) { |
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326 | xt_free_node(reply); |
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327 | return XT_ABORT; |
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328 | } |
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329 | xt_free_node(reply); |
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330 | |
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331 | return XT_HANDLED; |
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332 | } |
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333 | } else if (!c && !jd->ssl) { |
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334 | /* If the server does not advertise the STARTTLS feature and |
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335 | we're not in a secure connection already: (Servers have a |
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336 | habit of not advertising <starttls/> anymore when already |
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337 | using SSL/TLS. */ |
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338 | |
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339 | if (!trytls && set_getbool(&ic->acc->set, "tls")) { |
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340 | imcb_error(ic, "TLS is turned on for this account, but is not supported by this server"); |
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341 | imc_logout(ic, FALSE); |
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342 | |
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343 | return XT_ABORT; |
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344 | } |
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345 | } |
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346 | |
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347 | /* This one used to be in jabber_handlers[], but it has to be done |
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348 | from here to make sure the TLS session will be initialized |
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349 | properly before we attempt SASL authentication. */ |
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350 | if ((c = xt_find_node(node->children, "mechanisms"))) { |
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351 | if (sasl_pkt_mechanisms(c, data) == XT_ABORT) { |
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352 | return XT_ABORT; |
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353 | } |
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354 | } |
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355 | /* If the server *SEEMS* to support SASL authentication but doesn't |
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356 | support it after all, we should try to do authentication the |
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357 | other way. jabber.com doesn't seem to do SASL while it pretends |
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358 | to be XMPP 1.0 compliant! */ |
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359 | else if (!(jd->flags & JFLAG_AUTHENTICATED) && set_getbool(&ic->acc->set, "sasl") && sasl_supported(ic)) { |
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360 | if (!jabber_init_iq_auth(ic)) { |
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361 | return XT_ABORT; |
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362 | } |
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363 | } |
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364 | |
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365 | if ((c = xt_find_node(node->children, "bind"))) { |
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366 | jd->flags |= JFLAG_WANT_BIND; |
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367 | } |
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368 | |
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369 | if ((c = xt_find_node(node->children, "session"))) { |
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370 | jd->flags |= JFLAG_WANT_SESSION; |
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371 | } |
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372 | |
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373 | if (jd->flags & JFLAG_AUTHENTICATED) { |
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374 | return jabber_pkt_bind_sess(ic, NULL, NULL); |
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375 | } |
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376 | |
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377 | return XT_HANDLED; |
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378 | } |
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379 | |
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380 | static xt_status jabber_pkt_proceed_tls(struct xt_node *node, gpointer data) |
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381 | { |
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382 | struct im_connection *ic = data; |
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383 | struct jabber_data *jd = ic->proto_data; |
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384 | char *xmlns, *tlsname; |
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385 | |
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386 | xmlns = xt_find_attr(node, "xmlns"); |
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387 | |
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388 | /* Just ignore it when it doesn't seem to be TLS-related (is that at |
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389 | all possible??). */ |
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390 | if (!xmlns || strcmp(xmlns, XMLNS_TLS) != 0) { |
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391 | return XT_HANDLED; |
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392 | } |
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393 | |
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394 | /* We don't want event handlers to touch our TLS session while it's |
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395 | still initializing! */ |
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396 | b_event_remove(jd->r_inpa); |
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397 | if (jd->tx_len > 0) { |
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398 | /* Actually the write queue should be empty here, but just |
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399 | to be sure... */ |
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400 | b_event_remove(jd->w_inpa); |
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401 | g_free(jd->txq); |
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402 | jd->txq = NULL; |
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403 | jd->tx_len = 0; |
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404 | } |
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405 | jd->w_inpa = jd->r_inpa = 0; |
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406 | |
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407 | imcb_log(ic, "Converting stream to TLS"); |
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408 | |
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409 | jd->flags |= JFLAG_STARTTLS_DONE; |
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410 | |
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411 | /* If the user specified a server for the account, use this server as the |
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412 | * hostname in the certificate verification. Else we use the domain from |
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413 | * the username. */ |
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414 | if (ic->acc->server && *ic->acc->server) { |
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415 | tlsname = ic->acc->server; |
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416 | } else { |
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417 | tlsname = jd->server; |
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418 | } |
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419 | |
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420 | jd->ssl = ssl_starttls(jd->fd, tlsname, set_getbool(&ic->acc->set, "tls_verify"), |
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421 | jabber_connected_ssl, ic); |
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422 | |
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423 | return XT_HANDLED; |
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424 | } |
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425 | |
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426 | static xt_status jabber_pkt_stream_error(struct xt_node *node, gpointer data) |
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427 | { |
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428 | struct im_connection *ic = data; |
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429 | struct jabber_data *jd = ic->proto_data; |
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430 | int allow_reconnect = TRUE; |
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431 | struct jabber_error *err; |
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432 | struct xt_node *host; |
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433 | |
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434 | if (!(ic->flags & OPT_LOGGED_IN) && |
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435 | (host = xt_find_node(node->children, "see-other-host")) && |
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436 | host->text) { |
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437 | char *s; |
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438 | int port = set_getint(&ic->acc->set, "port"); |
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439 | |
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440 | /* Let's try to obey this request, if we're not logged |
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441 | in yet (i.e. not have too much state yet). */ |
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442 | if (jd->ssl) { |
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443 | ssl_disconnect(jd->ssl); |
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444 | } |
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445 | closesocket(jd->fd); |
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446 | b_event_remove(jd->r_inpa); |
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447 | b_event_remove(jd->w_inpa); |
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448 | |
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449 | jd->ssl = NULL; |
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450 | jd->r_inpa = jd->w_inpa = 0; |
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451 | jd->flags &= JFLAG_XMLCONSOLE; |
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452 | |
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453 | s = strchr(host->text, ':'); |
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454 | if (s != NULL) { |
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455 | sscanf(s + 1, "%d", &port); |
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456 | } |
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457 | |
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458 | imcb_log(ic, "Redirected to %s", host->text); |
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459 | jd->fd = proxy_connect(host->text, port, jabber_connected_plain, ic); |
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460 | |
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461 | return XT_ABORT; |
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462 | } |
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463 | |
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464 | err = jabber_error_parse(node, XMLNS_STREAM_ERROR); |
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465 | |
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466 | /* Tssk... */ |
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467 | if (err->code == NULL) { |
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468 | imcb_error(ic, "Unknown stream error reported by server"); |
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469 | imc_logout(ic, allow_reconnect); |
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470 | jabber_error_free(err); |
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471 | return XT_ABORT; |
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472 | } |
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473 | |
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474 | /* We know that this is a fatal error. If it's a "conflict" error, we |
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475 | should turn off auto-reconnect to make sure we won't get some nasty |
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476 | infinite loop! */ |
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477 | if (strcmp(err->code, "conflict") == 0) { |
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478 | imcb_error(ic, "Account and resource used from a different location"); |
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479 | allow_reconnect = FALSE; |
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480 | } else if (strcmp(err->code, "not-authorized") == 0) { |
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481 | imcb_error(ic, "Not authorized"); |
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482 | allow_reconnect = FALSE; |
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483 | } else { |
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484 | imcb_error(ic, "Stream error: %s%s%s", err->code, err->text ? ": " : "", |
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485 | err->text ? err->text : ""); |
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486 | } |
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487 | |
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488 | jabber_error_free(err); |
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489 | imc_logout(ic, allow_reconnect); |
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490 | |
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491 | return XT_ABORT; |
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492 | } |
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493 | |
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494 | static xt_status jabber_xmlconsole(struct xt_node *node, gpointer data) |
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495 | { |
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496 | struct im_connection *ic = data; |
---|
497 | struct jabber_data *jd = ic->proto_data; |
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498 | |
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499 | if (jd->flags & JFLAG_XMLCONSOLE) { |
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500 | char *msg, *pkt; |
---|
501 | |
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502 | pkt = xt_to_string(node); |
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503 | msg = g_strdup_printf("RX: %s", pkt); |
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504 | imcb_buddy_msg(ic, JABBER_XMLCONSOLE_HANDLE, msg, 0, 0); |
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505 | g_free(msg); |
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506 | g_free(pkt); |
---|
507 | } |
---|
508 | |
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509 | return XT_NEXT; |
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510 | } |
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511 | |
---|
512 | static const struct xt_handler_entry jabber_handlers[] = { |
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513 | { NULL, "stream:stream", jabber_xmlconsole }, |
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514 | { "stream:stream", "<root>", jabber_end_of_stream }, |
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515 | { "message", "stream:stream", jabber_pkt_message }, |
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516 | { "presence", "stream:stream", jabber_pkt_presence }, |
---|
517 | { "iq", "stream:stream", jabber_pkt_iq }, |
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518 | { "stream:features", "stream:stream", jabber_pkt_features }, |
---|
519 | { "stream:error", "stream:stream", jabber_pkt_stream_error }, |
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520 | { "proceed", "stream:stream", jabber_pkt_proceed_tls }, |
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521 | { "challenge", "stream:stream", sasl_pkt_challenge }, |
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522 | { "success", "stream:stream", sasl_pkt_result }, |
---|
523 | { "failure", "stream:stream", sasl_pkt_result }, |
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524 | { NULL, NULL, NULL } |
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525 | }; |
---|
526 | |
---|
527 | gboolean jabber_start_stream(struct im_connection *ic) |
---|
528 | { |
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529 | struct jabber_data *jd = ic->proto_data; |
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530 | int st; |
---|
531 | char *greet; |
---|
532 | |
---|
533 | /* We'll start our stream now, so prepare everything to receive one |
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534 | from the server too. */ |
---|
535 | xt_free(jd->xt); /* In case we're RE-starting. */ |
---|
536 | jd->xt = xt_new(jabber_handlers, ic); |
---|
537 | |
---|
538 | if (jd->r_inpa <= 0) { |
---|
539 | jd->r_inpa = b_input_add(jd->fd, B_EV_IO_READ, jabber_read_callback, ic); |
---|
540 | } |
---|
541 | |
---|
542 | greet = g_strdup_printf("%s<stream:stream to=\"%s\" xmlns=\"jabber:client\" " |
---|
543 | "xmlns:stream=\"http://etherx.jabber.org/streams\" version=\"1.0\">", |
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544 | (jd->flags & JFLAG_STARTTLS_DONE) ? "" : "<?xml version='1.0' ?>", |
---|
545 | jd->server); |
---|
546 | |
---|
547 | st = jabber_write(ic, greet, strlen(greet)); |
---|
548 | |
---|
549 | g_free(greet); |
---|
550 | |
---|
551 | return st; |
---|
552 | } |
---|
553 | |
---|
554 | void jabber_end_stream(struct im_connection *ic) |
---|
555 | { |
---|
556 | struct jabber_data *jd = ic->proto_data; |
---|
557 | |
---|
558 | /* Let's only do this if the queue is currently empty, otherwise it'd |
---|
559 | take too long anyway. */ |
---|
560 | if (jd->tx_len == 0) { |
---|
561 | char eos[] = "</stream:stream>"; |
---|
562 | struct xt_node *node; |
---|
563 | int st = 1; |
---|
564 | |
---|
565 | if (ic->flags & OPT_LOGGED_IN) { |
---|
566 | node = jabber_make_packet("presence", "unavailable", NULL, NULL); |
---|
567 | st = jabber_write_packet(ic, node); |
---|
568 | xt_free_node(node); |
---|
569 | } |
---|
570 | |
---|
571 | if (st) { |
---|
572 | jabber_write(ic, eos, strlen(eos)); |
---|
573 | } |
---|
574 | } |
---|
575 | } |
---|