Commit | Line | Data |
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8523533c TK |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-???? */ | |
6 | /* License: GPL */ | |
7 | ||
8 | /* Code for matching regular expressions against headers and body. | |
9 | Called from acl.c. */ | |
10 | ||
11 | #include "exim.h" | |
12 | #ifdef WITH_CONTENT_SCAN | |
13 | #include <unistd.h> | |
14 | #include <sys/mman.h> | |
15 | ||
16 | /* Structure to hold a list of Regular expressions */ | |
17 | typedef struct pcre_list { | |
18 | pcre *re; | |
19 | uschar *pcre_text; | |
20 | struct pcre_list *next; | |
21 | } pcre_list; | |
22 | ||
23 | uschar regex_match_string_buffer[1024]; | |
24 | ||
25 | extern FILE *mime_stream; | |
26 | extern uschar *mime_current_boundary; | |
27 | ||
28 | int regex(uschar **listptr) { | |
29 | int sep = 0; | |
30 | uschar *list = *listptr; | |
31 | uschar *regex_string; | |
32 | uschar regex_string_buffer[1024]; | |
f7b63901 | 33 | unsigned long mbox_size; |
8523533c TK |
34 | FILE *mbox_file; |
35 | pcre *re; | |
36 | pcre_list *re_list_head = NULL; | |
37 | pcre_list *re_list_item; | |
38 | const char *pcre_error; | |
39 | int pcre_erroffset; | |
40 | uschar *linebuffer; | |
41 | long f_pos = 0; | |
8e669ac1 | 42 | |
8523533c TK |
43 | /* reset expansion variable */ |
44 | regex_match_string = NULL; | |
8e669ac1 | 45 | |
8523533c TK |
46 | if (mime_stream == NULL) { |
47 | /* We are in the DATA ACL */ | |
8544e77a | 48 | mbox_file = spool_mbox(&mbox_size, NULL); |
8523533c TK |
49 | if (mbox_file == NULL) { |
50 | /* error while spooling */ | |
51 | log_write(0, LOG_MAIN|LOG_PANIC, | |
52 | "regex acl condition: error while creating mbox spool file"); | |
53 | return DEFER; | |
54 | }; | |
55 | } | |
56 | else { | |
57 | f_pos = ftell(mime_stream); | |
58 | mbox_file = mime_stream; | |
59 | }; | |
8e669ac1 | 60 | |
8523533c TK |
61 | /* precompile our regexes */ |
62 | while ((regex_string = string_nextinlist(&list, &sep, | |
63 | regex_string_buffer, | |
64 | sizeof(regex_string_buffer))) != NULL) { | |
8e669ac1 | 65 | |
8523533c | 66 | /* parse option */ |
8e669ac1 | 67 | if ( (strcmpic(regex_string,US"false") == 0) || |
8523533c TK |
68 | (Ustrcmp(regex_string,"0") == 0) ) { |
69 | /* explicitly no matching */ | |
70 | continue; | |
71 | }; | |
8e669ac1 | 72 | |
8523533c TK |
73 | /* compile our regular expression */ |
74 | re = pcre_compile( CS regex_string, | |
75 | 0, | |
76 | &pcre_error, | |
77 | &pcre_erroffset, | |
78 | NULL ); | |
79 | ||
80 | if (re == NULL) { | |
81 | log_write(0, LOG_MAIN, | |
82 | "regex acl condition warning - error in regex '%s': %s at offset %d, skipped.", regex_string, pcre_error, pcre_erroffset); | |
83 | continue; | |
84 | } | |
85 | else { | |
86 | re_list_item = store_get(sizeof(pcre_list)); | |
87 | re_list_item->re = re; | |
88 | re_list_item->pcre_text = string_copy(regex_string); | |
89 | re_list_item->next = re_list_head; | |
90 | re_list_head = re_list_item; | |
91 | }; | |
92 | }; | |
8e669ac1 | 93 | |
8523533c TK |
94 | /* no regexes -> nothing to do */ |
95 | if (re_list_head == NULL) { | |
96 | return FAIL; | |
97 | }; | |
8e669ac1 | 98 | |
8523533c TK |
99 | /* match each line against all regexes */ |
100 | linebuffer = store_get(32767); | |
8e669ac1 | 101 | while (fgets(CS linebuffer, 32767, mbox_file) != NULL) { |
8523533c TK |
102 | if ( (mime_stream != NULL) && (mime_current_boundary != NULL) ) { |
103 | /* check boundary */ | |
104 | if (Ustrncmp(linebuffer,"--",2) == 0) { | |
105 | if (Ustrncmp((linebuffer+2),mime_current_boundary,Ustrlen(mime_current_boundary)) == 0) | |
106 | /* found boundary */ | |
107 | break; | |
108 | }; | |
109 | }; | |
110 | re_list_item = re_list_head; | |
111 | do { | |
112 | /* try matcher on the line */ | |
113 | if (pcre_exec(re_list_item->re, NULL, CS linebuffer, | |
384152a6 | 114 | (int)Ustrlen(linebuffer), 0, 0, NULL, 0) >= 0) { |
8523533c TK |
115 | Ustrncpy(regex_match_string_buffer, re_list_item->pcre_text, 1023); |
116 | regex_match_string = regex_match_string_buffer; | |
117 | if (mime_stream == NULL) | |
f1e894f3 | 118 | (void)fclose(mbox_file); |
8523533c TK |
119 | else { |
120 | clearerr(mime_stream); | |
121 | fseek(mime_stream,f_pos,SEEK_SET); | |
122 | }; | |
123 | return OK; | |
124 | }; | |
125 | re_list_item = re_list_item->next; | |
126 | } while (re_list_item != NULL); | |
127 | }; | |
8e669ac1 | 128 | |
8523533c | 129 | if (mime_stream == NULL) |
f1e894f3 | 130 | (void)fclose(mbox_file); |
8523533c TK |
131 | else { |
132 | clearerr(mime_stream); | |
133 | fseek(mime_stream,f_pos,SEEK_SET); | |
134 | }; | |
8e669ac1 | 135 | |
8523533c TK |
136 | /* no matches ... */ |
137 | return FAIL; | |
138 | } | |
139 | ||
140 | ||
141 | int mime_regex(uschar **listptr) { | |
142 | int sep = 0; | |
143 | uschar *list = *listptr; | |
144 | uschar *regex_string; | |
145 | uschar regex_string_buffer[1024]; | |
146 | pcre *re; | |
147 | pcre_list *re_list_head = NULL; | |
148 | pcre_list *re_list_item; | |
149 | const char *pcre_error; | |
150 | int pcre_erroffset; | |
151 | FILE *f; | |
152 | uschar *mime_subject = NULL; | |
153 | int mime_subject_len = 0; | |
154 | ||
155 | /* reset expansion variable */ | |
156 | regex_match_string = NULL; | |
157 | ||
158 | /* precompile our regexes */ | |
159 | while ((regex_string = string_nextinlist(&list, &sep, | |
160 | regex_string_buffer, | |
161 | sizeof(regex_string_buffer))) != NULL) { | |
8e669ac1 | 162 | |
8523533c | 163 | /* parse option */ |
8e669ac1 | 164 | if ( (strcmpic(regex_string,US"false") == 0) || |
8523533c TK |
165 | (Ustrcmp(regex_string,"0") == 0) ) { |
166 | /* explicitly no matching */ | |
167 | continue; | |
168 | }; | |
8e669ac1 | 169 | |
8523533c TK |
170 | /* compile our regular expression */ |
171 | re = pcre_compile( CS regex_string, | |
172 | 0, | |
173 | &pcre_error, | |
174 | &pcre_erroffset, | |
175 | NULL ); | |
176 | ||
177 | if (re == NULL) { | |
178 | log_write(0, LOG_MAIN, | |
179 | "regex acl condition warning - error in regex '%s': %s at offset %d, skipped.", regex_string, pcre_error, pcre_erroffset); | |
180 | continue; | |
181 | } | |
182 | else { | |
183 | re_list_item = store_get(sizeof(pcre_list)); | |
184 | re_list_item->re = re; | |
185 | re_list_item->pcre_text = string_copy(regex_string); | |
186 | re_list_item->next = re_list_head; | |
187 | re_list_head = re_list_item; | |
188 | }; | |
189 | }; | |
8e669ac1 | 190 | |
8523533c TK |
191 | /* no regexes -> nothing to do */ |
192 | if (re_list_head == NULL) { | |
193 | return FAIL; | |
194 | }; | |
8e669ac1 | 195 | |
8523533c TK |
196 | /* check if the file is already decoded */ |
197 | if (mime_decoded_filename == NULL) { | |
198 | uschar *empty = US""; | |
199 | /* no, decode it first */ | |
200 | mime_decode(&empty); | |
201 | if (mime_decoded_filename == NULL) { | |
202 | /* decoding failed */ | |
203 | log_write(0, LOG_MAIN, | |
204 | "mime_regex acl condition warning - could not decode MIME part to file."); | |
205 | return DEFER; | |
206 | }; | |
207 | }; | |
208 | ||
209 | ||
210 | /* open file */ | |
c58b88df | 211 | f = fopen(CS mime_decoded_filename, "rb"); |
8523533c TK |
212 | if (f == NULL) { |
213 | /* open failed */ | |
214 | log_write(0, LOG_MAIN, | |
215 | "mime_regex acl condition warning - can't open '%s' for reading.", mime_decoded_filename); | |
216 | return DEFER; | |
217 | }; | |
8e669ac1 | 218 | |
8523533c TK |
219 | /* get 32k memory */ |
220 | mime_subject = (uschar *)store_get(32767); | |
8e669ac1 | 221 | |
8523533c TK |
222 | /* read max 32k chars from file */ |
223 | mime_subject_len = fread(mime_subject, 1, 32766, f); | |
8e669ac1 | 224 | |
8523533c TK |
225 | re_list_item = re_list_head; |
226 | do { | |
227 | /* try matcher on the mmapped file */ | |
228 | debug_printf("Matching '%s'\n", re_list_item->pcre_text); | |
229 | if (pcre_exec(re_list_item->re, NULL, CS mime_subject, | |
230 | mime_subject_len, 0, 0, NULL, 0) >= 0) { | |
231 | Ustrncpy(regex_match_string_buffer, re_list_item->pcre_text, 1023); | |
232 | regex_match_string = regex_match_string_buffer; | |
f1e894f3 | 233 | (void)fclose(f); |
8523533c TK |
234 | return OK; |
235 | }; | |
236 | re_list_item = re_list_item->next; | |
237 | } while (re_list_item != NULL); | |
238 | ||
f1e894f3 | 239 | (void)fclose(f); |
8e669ac1 | 240 | |
8523533c TK |
241 | /* no matches ... */ |
242 | return FAIL; | |
243 | } | |
244 | ||
245 | #endif |