Mercurial > hg > nginx
annotate src/mail/ngx_mail.h @ 7839:3974f4e56a4e
Mail: fixed s->arg_start clearing on invalid IMAP commands.
Previously, s->arg_start was left intact after invalid IMAP commands,
and this might result in an argument incorrectly added to the following
command. Similarly, s->backslash was left intact as well, leading
to unneeded backslash removal.
For example (LFs from the client are explicitly shown as "<LF>"):
S: * OK IMAP4 ready
C: a01 login "\<LF>
S: a01 BAD invalid command
C: a0000000000\2 authenticate <LF>
S: a00000000002 aBAD invalid command
The backslash followed by LF generates invalid command with s->arg_start
and s->backslash set, the following command incorrectly treats anything
from the old s->arg_start to the space after the command as an argument,
and removes the backslash from the tag. If there is no space, s->arg_end
will be NULL.
Both things seem to be harmless though. In particular:
- This can be used to provide an incorrect argument to a command without
arguments. The only command which seems to look at the single argument
is AUTHENTICATE, and it checks the argument length before trying to
access it.
- Backslash removal uses the "end" pointer, and stops due to "src < end"
condition instead of scanning all the process memory if s->arg_end is
NULL (and arg[0].len is huge).
- There should be no backslashes in unquoted strings.
An obvious fix is to clear s->arg_start and s->backslash on invalid commands,
similarly to how it is done in POP3 parsing (added in 810:e3aa8f305d21) and
SMTP parsing.
This, however, makes it clear that s->arg_start handling in the "done"
label is wrong: s->arg_start cannot be legitimately set there, as it
is expected to be cleared in all possible cases when the "done" label is
reached. The relevant code is dead and will be removed by the following
change.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Wed, 19 May 2021 03:13:20 +0300 |
parents | 4b8f23a36ebf |
children | 379d461eccf4 |
rev | line source |
---|---|
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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6 |
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7 |
1136 | 8 #ifndef _NGX_MAIL_H_INCLUDED_ |
9 #define _NGX_MAIL_H_INCLUDED_ | |
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10 |
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11 |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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14 #include <ngx_event.h> |
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15 #include <ngx_event_connect.h> |
417
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16 |
1136 | 17 #if (NGX_MAIL_SSL) |
18 #include <ngx_mail_ssl_module.h> | |
539 | 19 #endif |
20 | |
21 | |
417
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22 |
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23 typedef struct { |
583 | 24 void **main_conf; |
25 void **srv_conf; | |
1136 | 26 } ngx_mail_conf_ctx_t; |
521 | 27 |
28 | |
29 typedef struct { | |
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30 struct sockaddr *sockaddr; |
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31 socklen_t socklen; |
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32 ngx_str_t addr_text; |
641 | 33 |
34 /* server ctx */ | |
1136 | 35 ngx_mail_conf_ctx_t *ctx; |
641 | 36 |
37 unsigned bind:1; | |
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38 unsigned wildcard:1; |
2224 | 39 unsigned ssl:1; |
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40 #if (NGX_HAVE_INET6) |
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41 unsigned ipv6only:1; |
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42 #endif |
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43 unsigned so_keepalive:2; |
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44 unsigned proxy_protocol:1; |
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45 #if (NGX_HAVE_KEEPALIVE_TUNABLE) |
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46 int tcp_keepidle; |
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47 int tcp_keepintvl; |
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48 int tcp_keepcnt; |
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49 #endif |
6173 | 50 int backlog; |
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51 int rcvbuf; |
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52 int sndbuf; |
1136 | 53 } ngx_mail_listen_t; |
641 | 54 |
55 | |
56 typedef struct { | |
1136 | 57 ngx_mail_conf_ctx_t *ctx; |
641 | 58 ngx_str_t addr_text; |
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59 unsigned ssl:1; |
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60 unsigned proxy_protocol:1; |
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61 } ngx_mail_addr_conf_t; |
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62 |
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63 typedef struct { |
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64 in_addr_t addr; |
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65 ngx_mail_addr_conf_t conf; |
1136 | 66 } ngx_mail_in_addr_t; |
641 | 67 |
68 | |
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69 #if (NGX_HAVE_INET6) |
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70 |
641 | 71 typedef struct { |
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72 struct in6_addr addr6; |
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73 ngx_mail_addr_conf_t conf; |
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74 } ngx_mail_in6_addr_t; |
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75 |
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76 #endif |
641 | 77 |
78 | |
79 typedef struct { | |
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80 /* ngx_mail_in_addr_t or ngx_mail_in6_addr_t */ |
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81 void *addrs; |
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82 ngx_uint_t naddrs; |
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83 } ngx_mail_port_t; |
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84 |
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85 |
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86 typedef struct { |
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87 int family; |
641 | 88 in_port_t port; |
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89 ngx_array_t addrs; /* array of ngx_mail_conf_addr_t */ |
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90 } ngx_mail_conf_port_t; |
641 | 91 |
92 | |
93 typedef struct { | |
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94 ngx_mail_listen_t opt; |
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95 } ngx_mail_conf_addr_t; |
641 | 96 |
97 | |
98 typedef struct { | |
1136 | 99 ngx_array_t servers; /* ngx_mail_core_srv_conf_t */ |
100 ngx_array_t listen; /* ngx_mail_listen_t */ | |
101 } ngx_mail_core_main_conf_t; | |
521 | 102 |
103 | |
1136 | 104 #define NGX_MAIL_POP3_PROTOCOL 0 |
105 #define NGX_MAIL_IMAP_PROTOCOL 1 | |
106 #define NGX_MAIL_SMTP_PROTOCOL 2 | |
521 | 107 |
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108 |
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109 typedef struct ngx_mail_protocol_s ngx_mail_protocol_t; |
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110 |
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111 |
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112 typedef struct { |
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113 ngx_mail_protocol_t *protocol; |
521 | 114 |
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115 ngx_msec_t timeout; |
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116 ngx_msec_t resolver_timeout; |
521 | 117 |
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118 ngx_str_t server_name; |
527 | 119 |
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120 u_char *file_name; |
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121 ngx_uint_t line; |
527 | 122 |
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123 ngx_resolver_t *resolver; |
6130 | 124 ngx_log_t *error_log; |
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125 |
521 | 126 /* server ctx */ |
1136 | 127 ngx_mail_conf_ctx_t *ctx; |
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128 |
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129 ngx_uint_t listen; /* unsigned listen:1; */ |
1136 | 130 } ngx_mail_core_srv_conf_t; |
521 | 131 |
132 | |
527 | 133 typedef enum { |
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134 ngx_pop3_start = 0, |
527 | 135 ngx_pop3_user, |
809 | 136 ngx_pop3_passwd, |
137 ngx_pop3_auth_login_username, | |
138 ngx_pop3_auth_login_password, | |
139 ngx_pop3_auth_plain, | |
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140 ngx_pop3_auth_cram_md5, |
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141 ngx_pop3_auth_external |
1673 | 142 } ngx_pop3_state_e; |
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143 |
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144 |
1136 | 145 typedef enum { |
146 ngx_imap_start = 0, | |
1323 | 147 ngx_imap_auth_login_username, |
148 ngx_imap_auth_login_password, | |
149 ngx_imap_auth_plain, | |
150 ngx_imap_auth_cram_md5, | |
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151 ngx_imap_auth_external, |
1136 | 152 ngx_imap_login, |
153 ngx_imap_user, | |
154 ngx_imap_passwd | |
155 } ngx_imap_state_e; | |
156 | |
157 | |
158 typedef enum { | |
159 ngx_smtp_start = 0, | |
160 ngx_smtp_auth_login_username, | |
161 ngx_smtp_auth_login_password, | |
162 ngx_smtp_auth_plain, | |
163 ngx_smtp_auth_cram_md5, | |
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164 ngx_smtp_auth_external, |
1136 | 165 ngx_smtp_helo, |
2309 | 166 ngx_smtp_helo_xclient, |
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167 ngx_smtp_helo_auth, |
2309 | 168 ngx_smtp_helo_from, |
169 ngx_smtp_xclient, | |
170 ngx_smtp_xclient_from, | |
2497 | 171 ngx_smtp_xclient_helo, |
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172 ngx_smtp_xclient_auth, |
2309 | 173 ngx_smtp_from, |
174 ngx_smtp_to | |
1136 | 175 } ngx_smtp_state_e; |
176 | |
177 | |
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178 typedef struct { |
521 | 179 ngx_peer_connection_t upstream; |
180 ngx_buf_t *buffer; | |
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181 ngx_uint_t proxy_protocol; /* unsigned proxy_protocol:1; */ |
1136 | 182 } ngx_mail_proxy_ctx_t; |
521 | 183 |
184 | |
185 typedef struct { | |
1136 | 186 uint32_t signature; /* "MAIL" */ |
419
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187 |
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188 ngx_connection_t *connection; |
521 | 189 |
539 | 190 ngx_str_t out; |
419
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191 ngx_buf_t *buffer; |
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192 |
521 | 193 void **ctx; |
194 void **main_conf; | |
195 void **srv_conf; | |
196 | |
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197 ngx_resolver_ctx_t *resolver_ctx; |
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198 |
1136 | 199 ngx_mail_proxy_ctx_t *proxy; |
521 | 200 |
1136 | 201 ngx_uint_t mail_state; |
421
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202 |
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203 unsigned ssl:1; |
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204 unsigned protocol:3; |
539 | 205 unsigned blocked:1; |
206 unsigned quit:1; | |
527 | 207 unsigned quoted:1; |
543 | 208 unsigned backslash:1; |
209 unsigned no_sync_literal:1; | |
641 | 210 unsigned starttls:1; |
1136 | 211 unsigned esmtp:1; |
2309 | 212 unsigned auth_method:3; |
883 | 213 unsigned auth_wait:1; |
418
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214 |
422
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215 ngx_str_t login; |
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216 ngx_str_t passwd; |
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217 |
800 | 218 ngx_str_t salt; |
527 | 219 ngx_str_t tag; |
539 | 220 ngx_str_t tagged_line; |
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221 ngx_str_t text; |
527 | 222 |
641 | 223 ngx_str_t *addr_text; |
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224 ngx_str_t host; |
1136 | 225 ngx_str_t smtp_helo; |
2309 | 226 ngx_str_t smtp_from; |
227 ngx_str_t smtp_to; | |
641 | 228 |
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229 ngx_str_t cmd; |
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230 |
419
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231 ngx_uint_t command; |
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232 ngx_array_t args; |
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233 |
527 | 234 ngx_uint_t login_attempt; |
235 | |
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236 /* used to parse POP3/IMAP/SMTP command */ |
419
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237 |
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238 ngx_uint_t state; |
527 | 239 u_char *cmd_start; |
419
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240 u_char *arg_start; |
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241 u_char *arg_end; |
527 | 242 ngx_uint_t literal_len; |
1136 | 243 } ngx_mail_session_t; |
418
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244 |
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245 |
541 | 246 typedef struct { |
583 | 247 ngx_str_t *client; |
1136 | 248 ngx_mail_session_t *session; |
249 } ngx_mail_log_ctx_t; | |
541 | 250 |
251 | |
1323 | 252 #define NGX_POP3_USER 1 |
253 #define NGX_POP3_PASS 2 | |
254 #define NGX_POP3_CAPA 3 | |
255 #define NGX_POP3_QUIT 4 | |
256 #define NGX_POP3_NOOP 5 | |
257 #define NGX_POP3_STLS 6 | |
258 #define NGX_POP3_APOP 7 | |
259 #define NGX_POP3_AUTH 8 | |
260 #define NGX_POP3_STAT 9 | |
261 #define NGX_POP3_LIST 10 | |
262 #define NGX_POP3_RETR 11 | |
263 #define NGX_POP3_DELE 12 | |
264 #define NGX_POP3_RSET 13 | |
265 #define NGX_POP3_TOP 14 | |
266 #define NGX_POP3_UIDL 15 | |
419
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267 |
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268 |
1323 | 269 #define NGX_IMAP_LOGIN 1 |
270 #define NGX_IMAP_LOGOUT 2 | |
271 #define NGX_IMAP_CAPABILITY 3 | |
272 #define NGX_IMAP_NOOP 4 | |
273 #define NGX_IMAP_STARTTLS 5 | |
800 | 274 |
1323 | 275 #define NGX_IMAP_NEXT 6 |
276 | |
277 #define NGX_IMAP_AUTHENTICATE 7 | |
527 | 278 |
800 | 279 |
1323 | 280 #define NGX_SMTP_HELO 1 |
281 #define NGX_SMTP_EHLO 2 | |
282 #define NGX_SMTP_AUTH 3 | |
283 #define NGX_SMTP_QUIT 4 | |
284 #define NGX_SMTP_NOOP 5 | |
285 #define NGX_SMTP_MAIL 6 | |
286 #define NGX_SMTP_RSET 7 | |
287 #define NGX_SMTP_RCPT 8 | |
288 #define NGX_SMTP_DATA 9 | |
289 #define NGX_SMTP_VRFY 10 | |
290 #define NGX_SMTP_EXPN 11 | |
291 #define NGX_SMTP_HELP 12 | |
292 #define NGX_SMTP_STARTTLS 13 | |
527 | 293 |
294 | |
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295 #define NGX_MAIL_AUTH_PLAIN 0 |
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296 #define NGX_MAIL_AUTH_LOGIN 1 |
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297 #define NGX_MAIL_AUTH_LOGIN_USERNAME 2 |
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298 #define NGX_MAIL_AUTH_APOP 3 |
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299 #define NGX_MAIL_AUTH_CRAM_MD5 4 |
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300 #define NGX_MAIL_AUTH_EXTERNAL 5 |
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301 #define NGX_MAIL_AUTH_NONE 6 |
419
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302 |
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303 |
1136 | 304 #define NGX_MAIL_AUTH_PLAIN_ENABLED 0x0002 |
305 #define NGX_MAIL_AUTH_LOGIN_ENABLED 0x0004 | |
306 #define NGX_MAIL_AUTH_APOP_ENABLED 0x0008 | |
307 #define NGX_MAIL_AUTH_CRAM_MD5_ENABLED 0x0010 | |
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308 #define NGX_MAIL_AUTH_EXTERNAL_ENABLED 0x0020 |
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309 #define NGX_MAIL_AUTH_NONE_ENABLED 0x0040 |
521 | 310 |
311 | |
1136 | 312 #define NGX_MAIL_PARSE_INVALID_COMMAND 20 |
521 | 313 |
314 | |
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315 typedef void (*ngx_mail_init_session_pt)(ngx_mail_session_t *s, |
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316 ngx_connection_t *c); |
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317 typedef void (*ngx_mail_init_protocol_pt)(ngx_event_t *rev); |
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318 typedef void (*ngx_mail_auth_state_pt)(ngx_event_t *rev); |
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319 typedef ngx_int_t (*ngx_mail_parse_command_pt)(ngx_mail_session_t *s); |
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320 |
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321 |
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322 struct ngx_mail_protocol_s { |
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323 ngx_str_t name; |
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324 in_port_t port[4]; |
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325 ngx_uint_t type; |
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326 |
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327 ngx_mail_init_session_pt init_session; |
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328 ngx_mail_init_protocol_pt init_protocol; |
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329 ngx_mail_parse_command_pt parse_command; |
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330 ngx_mail_auth_state_pt auth_state; |
1136 | 331 |
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332 ngx_str_t internal_server_error; |
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333 ngx_str_t cert_error; |
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334 ngx_str_t no_cert; |
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335 }; |
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336 |
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337 |
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338 typedef struct { |
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339 ngx_mail_protocol_t *protocol; |
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340 |
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341 void *(*create_main_conf)(ngx_conf_t *cf); |
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342 char *(*init_main_conf)(ngx_conf_t *cf, void *conf); |
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343 |
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344 void *(*create_srv_conf)(ngx_conf_t *cf); |
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345 char *(*merge_srv_conf)(ngx_conf_t *cf, void *prev, |
6474 | 346 void *conf); |
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347 } ngx_mail_module_t; |
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348 |
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349 |
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350 #define NGX_MAIL_MODULE 0x4C49414D /* "MAIL" */ |
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351 |
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352 #define NGX_MAIL_MAIN_CONF 0x02000000 |
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353 #define NGX_MAIL_SRV_CONF 0x04000000 |
1136 | 354 |
355 | |
356 #define NGX_MAIL_MAIN_CONF_OFFSET offsetof(ngx_mail_conf_ctx_t, main_conf) | |
357 #define NGX_MAIL_SRV_CONF_OFFSET offsetof(ngx_mail_conf_ctx_t, srv_conf) | |
358 | |
359 | |
360 #define ngx_mail_get_module_ctx(s, module) (s)->ctx[module.ctx_index] | |
361 #define ngx_mail_set_ctx(s, c, module) s->ctx[module.ctx_index] = c; | |
362 #define ngx_mail_delete_ctx(s, module) s->ctx[module.ctx_index] = NULL; | |
521 | 363 |
364 | |
1136 | 365 #define ngx_mail_get_module_main_conf(s, module) \ |
521 | 366 (s)->main_conf[module.ctx_index] |
1136 | 367 #define ngx_mail_get_module_srv_conf(s, module) (s)->srv_conf[module.ctx_index] |
423
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368 |
1136 | 369 #define ngx_mail_conf_get_module_main_conf(cf, module) \ |
370 ((ngx_mail_conf_ctx_t *) cf->ctx)->main_conf[module.ctx_index] | |
1322 | 371 #define ngx_mail_conf_get_module_srv_conf(cf, module) \ |
372 ((ngx_mail_conf_ctx_t *) cf->ctx)->srv_conf[module.ctx_index] | |
641 | 373 |
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374 |
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375 #if (NGX_MAIL_SSL) |
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376 void ngx_mail_starttls_handler(ngx_event_t *rev); |
1479 | 377 ngx_int_t ngx_mail_starttls_only(ngx_mail_session_t *s, ngx_connection_t *c); |
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378 #endif |
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379 |
423
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380 |
1136 | 381 void ngx_mail_init_connection(ngx_connection_t *c); |
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382 |
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383 ngx_int_t ngx_mail_salt(ngx_mail_session_t *s, ngx_connection_t *c, |
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384 ngx_mail_core_srv_conf_t *cscf); |
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385 ngx_int_t ngx_mail_auth_plain(ngx_mail_session_t *s, ngx_connection_t *c, |
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386 ngx_uint_t n); |
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387 ngx_int_t ngx_mail_auth_login_username(ngx_mail_session_t *s, |
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388 ngx_connection_t *c, ngx_uint_t n); |
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389 ngx_int_t ngx_mail_auth_login_password(ngx_mail_session_t *s, |
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390 ngx_connection_t *c); |
1479 | 391 ngx_int_t ngx_mail_auth_cram_md5_salt(ngx_mail_session_t *s, |
392 ngx_connection_t *c, char *prefix, size_t len); | |
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393 ngx_int_t ngx_mail_auth_cram_md5(ngx_mail_session_t *s, ngx_connection_t *c); |
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394 ngx_int_t ngx_mail_auth_external(ngx_mail_session_t *s, ngx_connection_t *c, |
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395 ngx_uint_t n); |
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396 ngx_int_t ngx_mail_auth_parse(ngx_mail_session_t *s, ngx_connection_t *c); |
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397 |
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398 void ngx_mail_send(ngx_event_t *wev); |
1482 | 399 ngx_int_t ngx_mail_read_command(ngx_mail_session_t *s, ngx_connection_t *c); |
400 void ngx_mail_auth(ngx_mail_session_t *s, ngx_connection_t *c); | |
1136 | 401 void ngx_mail_close_connection(ngx_connection_t *c); |
402 void ngx_mail_session_internal_server_error(ngx_mail_session_t *s); | |
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403 u_char *ngx_mail_log_error(ngx_log_t *log, u_char *buf, size_t len); |
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404 |
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405 |
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406 char *ngx_mail_capabilities(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); |
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407 |
417
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408 |
521 | 409 /* STUB */ |
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410 void ngx_mail_proxy_init(ngx_mail_session_t *s, ngx_addr_t *peer); |
1136 | 411 void ngx_mail_auth_http_init(ngx_mail_session_t *s); |
7795 | 412 ngx_int_t ngx_mail_realip_handler(ngx_mail_session_t *s); |
521 | 413 /**/ |
414 | |
415 | |
1136 | 416 extern ngx_uint_t ngx_mail_max_module; |
417 extern ngx_module_t ngx_mail_core_module; | |
521 | 418 |
419 | |
1136 | 420 #endif /* _NGX_MAIL_H_INCLUDED_ */ |