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/* |
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* Copyright (C) 2013-2019 Cisco Systems, Inc. and/or its affiliates. All rights reserved. |
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* Copyright (C) 2008-2013 Sourcefire, Inc. |
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*
* Author: aCaB <acab@clamav.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301, USA.
*/
#if HAVE_CONFIG_H
#include "clamav-config.h"
#endif
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
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#include "libclamav/regex/regex.h" |
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#include "shared/output.h" |
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#include "whitelist.h" |
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struct WHLST {
regex_t preg;
struct WHLST *next;
};
struct WHLST *wfrom = NULL;
struct WHLST *wto = NULL;
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int skipauth = 0;
regex_t authreg;
|
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void whitelist_free(void) {
struct WHLST *w;
while(wfrom) {
w = wfrom->next; |
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cli_regfree(&wfrom->preg); |
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free(wfrom);
wfrom = w;
}
while(wto) { |
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w = wto->next; |
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cli_regfree(&wto->preg); |
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free(wto);
wto = w;
}
}
int whitelist_init(const char *fname) {
char buf[2048];
FILE *f;
struct WHLST *w;
if(!(f = fopen(fname, "r"))) { |
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logg("!Cannot open whitelist file '%s'\n", fname); |
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return 1;
}
while(fgets(buf, sizeof(buf), f) != NULL) {
struct WHLST **addto = &wto;
char *ptr = buf;
int len;
if(*buf == '#' || *buf == ':' || *buf == '!')
continue;
if(!strncasecmp("From:", buf, 5)) {
ptr+=5;
addto = &wfrom;
} else if (!strncasecmp("To:", buf, 3))
ptr+=3;
len = strlen(ptr) - 1;
for(;len>=0; len--) { |
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if(ptr[len] != '\n' && ptr[len] != '\r') break;
ptr[len] = '\0'; |
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}
if(!len) continue;
if (!(w = (struct WHLST *)malloc(sizeof(*w)))) { |
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logg("!Out of memory loading whitelist file\n"); |
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whitelist_free(); |
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fclose(f); |
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return 1;
} |
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w->next = (*addto); |
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(*addto) = w; |
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if (cli_regcomp(&w->preg, ptr, REG_ICASE|REG_NOSUB)) {
logg("!Failed to compile regex '%s' in whitelist file\n", ptr); |
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whitelist_free(); |
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fclose(f); |
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return 1;
}
} |
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fclose(f); |
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return 0;
}
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int whitelisted(const char *addr, int from) { |
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struct WHLST *w;
if(from) w = wfrom;
else w = wto; |
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|
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while(w) { |
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if(!cli_regexec(&w->preg, addr, 0, NULL, 0)) |
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return 1;
w = w->next;
}
return 0;
}
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int smtpauth_init(const char *r) { |
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char *regex = NULL;
if(!strncmp(r, "file:", 5)) {
char buf[2048];
FILE *f = fopen(r+5, "r");
int rxsize = 0, rxavail = 0, rxused=0;
if(!f) {
logg("!Cannot open whitelist file '%s'\n", r+5);
return 1;
}
while(fgets(buf, sizeof(buf), f) != NULL) {
int len;
char *ptr;
if(*buf == '#' || *buf == ':' || *buf == '!')
continue;
len = strlen(buf) - 1;
for(;len>=0; len--) {
if(buf[len] != '\n' && buf[len] != '\r') break;
buf[len] = '\0';
}
if(len<=0) continue;
if(len*3+1 > rxavail) {
ptr = regex;
regex = realloc(regex, rxsize + 2048);
if(!regex) {
logg("!Cannot allocate memory for SkipAuthenticated file\n"); |
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fclose(f); |
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return 1;
}
rxavail = 2048;
rxsize += 2048;
if(!ptr) {
regex[0] = '^';
regex[1] = '(';
rxavail -= 2;
rxused = 2;
}
}
ptr = buf;
while(*ptr) {
if((*ptr>='A' && *ptr<='Z') || (*ptr>='a' && *ptr<='z') || (*ptr>='0' && *ptr<='9') || *ptr=='@') {
regex[rxused] = *ptr;
rxused++;
rxavail--;
} else {
regex[rxused] = '[';
regex[rxused+1] = *ptr;
regex[rxused+2] = ']';
rxused += 3;
rxavail -= 3;
}
ptr++;
}
regex[rxused++] = '|';
rxavail--;
}
if(rxavail < 4 && !(regex = realloc(regex, rxsize + 4))) {
logg("!Cannot allocate memory for SkipAuthenticated file\n"); |
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fclose(f); |
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return 1;
}
regex[rxused-1] = ')';
regex[rxused] = '$';
regex[rxused+1] = '\0';
r = regex; |
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fclose(f); |
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}
if(cli_regcomp(&authreg, r, REG_ICASE|REG_NOSUB|REG_EXTENDED)) {
logg("!Failed to compile regex '%s' for SkipAuthenticated\n", r);
if(regex) free(regex); |
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return 1;
} |
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if(regex) free(regex); |
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skipauth = 1;
return 0;
}
int smtpauthed(const char *login) {
if(skipauth && !cli_regexec(&authreg, login, 0, NULL, 0))
return 1;
return 0;
}
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/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* tab-width: 8
* End:
* vim: set cindent smartindent autoindent softtabstop=4 shiftwidth=4 tabstop=8:
*/ |