/*
* PERMISSIONS module
*
* Copyright (C) 2003 Miklós Tirpák (mtirpak@sztaki.hu)
* Copyright (C) 2003 iptel.org
* Copyright (C) 2003-2007 Juha Heinanen
*
* This file is part of Kamailio, a free SIP server.
*
* Kamailio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version
*
* Kamailio 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
*
*/
#include <stdio.h>
#include "permissions.h"
#include "parse_config.h"
#include "trusted.h"
#include "address.h"
#include "hash.h"
#include "rpc.h"
#include "../../core/mem/mem.h"
#include "../../core/parser/parse_from.h"
#include "../../core/parser/parse_uri.h"
#include "../../core/parser/parse_refer_to.h"
#include "../../core/parser/contact/parse_contact.h"
#include "../../core/str.h"
#include "../../core/dset.h"
#include "../../core/globals.h"
#include "../../core/mod_fix.h"
#include "../../core/ut.h"
#include "../../core/rpc.h"
#include "../../core/rpc_lookup.h"
#include "../../core/kemi.h"
MODULE_VERSION
static rule_file_t perm_allow[MAX_RULE_FILES]; /* Parsed allow files */
static rule_file_t perm_deny[MAX_RULE_FILES]; /* Parsed deny files */
static int perm_rules_num = 0; /* Number of parsed allow/deny files */
/* Module parameter variables */
static char* perm_default_allow_file = DEFAULT_ALLOW_FILE;
static char* perm_default_deny_file = DEFAULT_DENY_FILE;
char* perm_allow_suffix = ".allow";
static char* perm_deny_suffix = ".deny";
/* for allow_trusted and allow_address function */
str perm_db_url = {NULL, 0}; /* Don't connect to the database by default */
/* for allow_trusted function */
int perm_db_mode = DISABLE_CACHE; /* Database usage mode: 0=no cache, 1=cache */
str perm_trusted_table = str_init("trusted"); /* Name of trusted table */
str perm_source_col = str_init("src_ip"); /* Name of source address column */
str perm_proto_col = str_init("proto"); /* Name of protocol column */
str perm_from_col = str_init("from_pattern"); /* Name of from pattern column */
str perm_ruri_col = str_init("ruri_pattern"); /* Name of RURI pattern column */
str perm_tag_col = str_init("tag"); /* Name of tag column */
str perm_priority_col = str_init("priority"); /* Name of priority column */
str perm_tag_avp_param = {NULL, 0}; /* Peer tag AVP spec */
int perm_peer_tag_mode = 0; /* Add tags form all mathcing peers to avp */
/* for allow_address function */
str perm_address_table = str_init("address"); /* Name of address table */
str perm_grp_col = str_init("grp"); /* Name of address group column */
str perm_ip_addr_col = str_init("ip_addr"); /* Name of ip address column */
str perm_mask_col = str_init("mask"); /* Name of mask column */
str perm_port_col = str_init("port"); /* Name of port column */
static str perm_address_file_param = STR_NULL; /* Path to file with address records */
str perm_address_file = STR_NULL; /* Full path to file with address records */
/*
* By default we check all branches
*/
static int perm_check_all_branches = 1;
int _perm_max_subnets = 512;
int _perm_load_backends = 0xFFFF;
/*
* Convert the name of the files into table index
*/
static int load_fixup(void** param, int param_no);
/*
* Convert the name of the file into table index, this
* function takes just one name, appends .allow and .deny
* to and and the rest is same as in load_fixup
*/
static int single_fixup(void** param, int param_no);
/*
* Parse pseudo variable parameter
*/
static int double_fixup(void** param, int param_no);
static int fixup_allow_address(void** param, int param_no);
static int allow_routing_0(struct sip_msg* msg, char* str1, char* str2);
static int allow_routing_1(struct sip_msg* msg, char* basename, char* str2);
static int allow_routing_2(struct sip_msg* msg, char* allow_file, char* deny_file);
static int allow_register_1(struct sip_msg* msg, char* basename, char* s);
static int allow_register_2(struct sip_msg* msg, char* allow_file, char* deny_file);
static int allow_uri(struct sip_msg* msg, char* basename, char* uri);
static int mod_init(void);
static void mod_exit(void);
static int child_init(int rank);
static int permissions_init_rpc(void);
/* Exported functions */
static cmd_export_t cmds[] = {
{"allow_routing", (cmd_function)allow_routing_0, 0, 0, 0,
ANY_ROUTE},
{"allow_routing", (cmd_function)allow_routing_1, 1, single_fixup, 0,
ANY_ROUTE},
{"allow_routing", (cmd_function)allow_routing_2, 2, load_fixup, 0,
ANY_ROUTE},
{"allow_register", (cmd_function)allow_register_1, 1, single_fixup, 0,
REQUEST_ROUTE | FAILURE_ROUTE},
{"allow_register", (cmd_function)allow_register_2, 2, load_fixup, 0,
REQUEST_ROUTE | FAILURE_ROUTE},
{"allow_trusted", (cmd_function)allow_trusted_0, 0, 0, 0,
ANY_ROUTE},
{"allow_trusted", (cmd_function)allow_trusted_2, 2, fixup_spve_spve,
fixup_free_spve_spve, ANY_ROUTE},
{"allow_trusted", (cmd_function)allow_trusted_3, 3, fixup_spve_all,
fixup_free_spve_all, ANY_ROUTE},
{"allow_uri", (cmd_function)allow_uri, 2, double_fixup, 0,
REQUEST_ROUTE | FAILURE_ROUTE},
{"allow_address", (cmd_function)w_allow_address, 3, fixup_allow_address,
0, ANY_ROUTE},
{"allow_source_address", (cmd_function)w_allow_source_address, 1, fixup_igp_null, 0,
ANY_ROUTE},
{"allow_source_address", (cmd_function)w_allow_source_address, 0, 0, 0,
ANY_ROUTE},
{"allow_source_address_group", (cmd_function)allow_source_address_group, 0, 0, 0,
ANY_ROUTE},
{"allow_address_group", (cmd_function)allow_address_group, 2, fixup_spve_igp,
fixup_free_spve_igp, ANY_ROUTE},
{0, 0, 0, 0, 0, 0}
};
/* Exported parameters */
static param_export_t params[] = {
{"default_allow_file", PARAM_STRING, &perm_default_allow_file},
{"default_deny_file", PARAM_STRING, &perm_default_deny_file },
{"check_all_branches", INT_PARAM, &perm_check_all_branches },
{"allow_suffix", PARAM_STRING, &perm_allow_suffix },
{"deny_suffix", PARAM_STRING, &perm_deny_suffix },
{"db_url", PARAM_STR, &perm_db_url },
{"db_mode", INT_PARAM, &perm_db_mode },
{"trusted_table", PARAM_STR, &perm_trusted_table },
{"source_col", PARAM_STR, &perm_source_col },
{"proto_col", PARAM_STR, &perm_proto_col },
{"from_col", PARAM_STR, &perm_from_col },
{"ruri_col", PARAM_STR, &perm_ruri_col },
{"tag_col", PARAM_STR, &perm_tag_col },
{"priority_col", PARAM_STR, &perm_priority_col },
{"peer_tag_avp", PARAM_STR, &perm_tag_avp_param },
{"peer_tag_mode", INT_PARAM, &perm_peer_tag_mode },
{"address_table", PARAM_STR, &perm_address_table },
{"address_file", PARAM_STR, &perm_address_file_param },
{"grp_col", PARAM_STR, &perm_grp_col },
{"ip_addr_col", PARAM_STR, &perm_ip_addr_col },
{"mask_col", PARAM_STR, &perm_mask_col },
{"port_col", PARAM_STR, &perm_port_col },
{"max_subnets", PARAM_INT, &_perm_max_subnets },
{"load_backends", PARAM_INT, &_perm_load_backends },
{0, 0, 0}
};
/* Module interface */
struct module_exports exports = {
"permissions", /* module name */
DEFAULT_DLFLAGS, /* dlopen flags */
cmds, /* Exported functions */
params, /* Exported parameters */
0, /* RPC method exports */
0, /* exported pseudo-variables */
0, /* response function */
mod_init, /* module initialization function */
child_init, /* child initialization function */
mod_exit /* destroy function */
};
/*
* Extract path (the beginning of the string
* up to the last / character
* Returns length of the path
*/
static int get_path(char* pathname)
{
char* c;
if (!pathname) return 0;
c = strrchr(pathname, '/');
if (!c) return 0;
return c - pathname + 1;
}
/*
* Prepend path if necessary
*/
static char* get_pathname(char* name)
{
char* buffer;
int path_len, name_len;
if (!name) return 0;
name_len = strlen(name);
if (strchr(name, '/')) {
buffer = (char*)pkg_malloc(name_len + 1);
if (!buffer) goto err;
strcpy(buffer, name);
return buffer;
} else {
path_len = get_path(cfg_file);
buffer = (char*)pkg_malloc(path_len + name_len + 1);
if (!buffer) goto err;
memcpy(buffer, cfg_file, path_len);
memcpy(buffer + path_len, name, name_len);
buffer[path_len + name_len] = '\0';
return buffer;
}
err:
LM_ERR("no pkg memory left\n");
return 0;
}
/*
* If the file pathname has been parsed already then the
* function returns its index in the tables, otherwise it
* returns -1 to indicate that the file needs to be read
* and parsed yet
*/
static int find_index(rule_file_t* array, char* pathname)
{
int i;
for(i = 0; i < perm_rules_num; i++) {
if (!strcmp(pathname, array[i].filename)) return i;
}
return -1;
}
/*
* Return URI without all the bells and whistles, that means only
* sip:username@domain, resulting buffer is statically allocated and
* zero terminated
*/
static char* get_plain_uri(const str* uri)
{
static char buffer[EXPRESSION_LENGTH + 1];
struct sip_uri puri;
int len;
if (!uri) return 0;
if (parse_uri(uri->s, uri->len, &puri) < 0) {
LM_ERR("failed to parse URI\n");
return 0;
}
if (puri.user.len) {
len = puri.user.len + puri.host.len + 5;
} else {
len = puri.host.len + 4;
}
if (len > EXPRESSION_LENGTH) {
LM_ERR("Request-URI is too long: %d chars\n", len);
return 0;
}
strcpy(buffer, "sip:");
if (puri.user.len) {
memcpy(buffer + 4, puri.user.s, puri.user.len);
buffer[puri.user.len + 4] = '@';
memcpy(buffer + puri.user.len + 5, puri.host.s, puri.host.len);
} else {
memcpy(buffer + 4, puri.host.s, puri.host.len);
}
buffer[len] = '\0';
return buffer;
}
/*
* determines the permission of the call
* return values:
* -1: deny
* 1: allow
*/
static int check_routing(struct sip_msg* msg, int idx)
{
struct hdr_field *from;
int len, q;
static char from_str[EXPRESSION_LENGTH+1];
static char ruri_str[EXPRESSION_LENGTH+1];
char* uri_str;
str branch;
int br_idx;
/* turn off control, allow any routing */
if ((!perm_allow[idx].rules) && (!perm_deny[idx].rules)) {
LM_DBG("no rules => allow any routing\n");
return 1;
}
/* looking for FROM HF */
if ((!msg->from) && (parse_headers(msg, HDR_FROM_F, 0) == -1)) {
LM_ERR("failed to parse message\n");
return -1;
}
if (!msg->from) {
LM_ERR("FROM header field not found\n");
return -1;
}
/* we must call parse_from_header explicitly */
if ((!(msg->from)->parsed) && (parse_from_header(msg) < 0)) {
LM_ERR("failed to parse From body\n");
return -1;
}
from = msg->from;
len = ((struct to_body*)from->parsed)->uri.len;
if (len > EXPRESSION_LENGTH) {
LM_ERR("From header field is too long: %d chars\n", len);
return -1;
}
strncpy(from_str, ((struct to_body*)from->parsed)->uri.s, len);
from_str[len] = '\0';
/* looking for request URI */
if (parse_sip_msg_uri(msg) < 0) {
LM_ERR("uri parsing failed\n");
return -1;
}
len = msg->parsed_uri.user.len + msg->parsed_uri.host.len + 5;
if (len > EXPRESSION_LENGTH) {
LM_ERR("Request URI is too long: %d chars\n", len);
return -1;
}
strcpy(ruri_str, "sip:");
memcpy(ruri_str + 4, msg->parsed_uri.user.s, msg->parsed_uri.user.len);
ruri_str[msg->parsed_uri.user.len + 4] = '@';
memcpy(ruri_str + msg->parsed_uri.user.len + 5, msg->parsed_uri.host.s, msg->parsed_uri.host.len);
ruri_str[len] = '\0';
LM_DBG("looking for From: %s Request-URI: %s\n", from_str, ruri_str);
/* rule exists in allow file */
if (search_rule(perm_allow[idx].rules, from_str, ruri_str)) {
if (perm_check_all_branches) goto check_branches;
LM_DBG("allow rule found => routing is allowed\n");
return 1;
}
/* rule exists in deny file */
if (search_rule(perm_deny[idx].rules, from_str, ruri_str)) {
LM_DBG("deny rule found => routing is denied\n");
return -1;
}
if (!perm_check_all_branches) {
LM_DBG("neither allow nor deny rule found => routing is allowed\n");
return 1;
}
check_branches:
for( br_idx=0 ; (branch.s=get_branch(br_idx,&branch.len,&q,0,0,0,0,0,0,0))!=0 ;
br_idx++ ) {
uri_str = get_plain_uri(&branch);
if (!uri_str) {
LM_ERR("failed to extract plain URI\n");
return -1;
}
LM_DBG("looking for From: %s Branch: %s\n", from_str, uri_str);
if (search_rule(perm_allow[idx].rules, from_str, uri_str)) {
continue;
}
if (search_rule(perm_deny[idx].rules, from_str, uri_str)) {
LM_DBG("deny rule found for one of branches => routing"
"is denied\n");
return -1;
}
}
LM_DBG("check of branches passed => routing is allowed\n");
return 1;
}
/*
* Convert the name of the files into table index
*/
static int load_fixup(void** param, int param_no)
{
char* pathname;
int idx;
rule_file_t* table;
if (param_no == 1) {
table = perm_allow;
} else {
table = perm_deny;
}
pathname = get_pathname(*param);
idx = find_index(table, pathname);
if (idx == -1) {
/* Not opened yet, open the file and parse it */
table[perm_rules_num].filename = pathname;
table[perm_rules_num].rules = parse_config_file(pathname);
if (table[perm_rules_num].rules) {
LM_DBG("file (%s) parsed\n", pathname);
} else {
LM_INFO("file (%s) not parsed properly => empty rule set\n", pathname);
}
*param = (void*)(long)perm_rules_num;
if (param_no == 2) perm_rules_num++;
} else {
/* File already parsed, re-use it */
LM_DBG("file (%s) already loaded, re-using\n", pathname);
pkg_free(pathname);
*param = (void*)(long)idx;
}
return 0;
}
/*
* Convert the name of the file into table index
*/
static int single_fixup(void** param, int param_no)
{
char* buffer;
void* tmp;
int param_len, ret, suffix_len;
if (param_no != 1) return 0;
param_len = strlen((char*)*param);
if (strlen(perm_allow_suffix) > strlen(perm_deny_suffix)) {
suffix_len = strlen(perm_allow_suffix);
} else {
suffix_len = strlen(perm_deny_suffix);
}
buffer = pkg_malloc(param_len + suffix_len + 1);
if (!buffer) {
LM_ERR("no pkg memory left\n");
return -1;
}
strcpy(buffer, (char*)*param);
strcat(buffer, perm_allow_suffix);
tmp = buffer;
ret = load_fixup(&tmp, 1);
strcpy(buffer + param_len, perm_deny_suffix);
tmp = buffer;
ret |= load_fixup(&tmp, 2);
*param = tmp;
pkg_free(buffer);
return ret;
}
/*
* Convert the name of the file into table index and pvar into parsed pseudo
* variable specification
*/
static int double_fixup(void** param, int param_no)
{
char* buffer;
void* tmp;
int param_len, ret, suffix_len;
pv_spec_t *sp;
str s;
if (param_no == 1) { /* basename */
param_len = strlen((char*)*param);
if (strlen(perm_allow_suffix) > strlen(perm_deny_suffix)) {
suffix_len = strlen(perm_allow_suffix);
} else {
suffix_len = strlen(perm_deny_suffix);
}
buffer = pkg_malloc(param_len + suffix_len + 1);
if (!buffer) {
LM_ERR("no pkg memory left\n");
return -1;
}
strcpy(buffer, (char*)*param);
strcat(buffer, perm_allow_suffix);
tmp = buffer;
ret = load_fixup(&tmp, 1);
strcpy(buffer + param_len, perm_deny_suffix);
tmp = buffer;
ret |= load_fixup(&tmp, 2);
*param = tmp;
pkg_free(buffer);
return 0;
} else if (param_no == 2) { /* pseudo variable */
sp = (pv_spec_t*)pkg_malloc(sizeof(pv_spec_t));
if (sp == 0) {
LM_ERR("no pkg memory left\n");
return -1;
}
s.s = (char*)*param; s.len = strlen(s.s);
if (pv_parse_spec(&s, sp) == 0) {
LM_ERR("parsing of pseudo variable %s failed!\n", (char*)*param);
pkg_free(sp);
return -1;
}
if (sp->type == PVT_NULL) {
LM_ERR("bad pseudo variable\n");
pkg_free(sp);
return -1;
}
*param = (void*)sp;
return 0;
}
*param = (void *)0;
return 0;
}
/*
* module initialization function
*/
static int mod_init(void)
{
if(_perm_load_backends==0) {
LM_ERR("failure - no backend to be loaded\n");
return -1;
}
if(permissions_init_rpc()!=0) {
LM_ERR("failed to register RPC commands\n");
return -1;
}
if(_perm_load_backends&PERM_LOAD_ALLOWFILE) {
perm_allow[0].filename = get_pathname(perm_default_allow_file);
perm_allow[0].rules = parse_config_file(perm_allow[0].filename);
if (perm_allow[0].rules) {
LM_DBG("default allow file (%s) parsed\n", perm_allow[0].filename);
} else {
LM_INFO("default allow file (%s) not found => empty rule set\n",
perm_allow[0].filename);
}
} else {
perm_allow[0].filename = NULL;
perm_allow[0].rules = NULL;
}
if(_perm_load_backends&PERM_LOAD_DENYFILE) {
perm_deny[0].filename = get_pathname(perm_default_deny_file);
perm_deny[0].rules = parse_config_file(perm_deny[0].filename);
if (perm_deny[0].rules) {
LM_DBG("default deny file (%s) parsed\n", perm_deny[0].filename);
} else {
LM_INFO("default deny file (%s) not found => empty rule set\n",
perm_deny[0].filename);
}
} else {
perm_deny[0].filename = NULL;
perm_deny[0].rules = NULL;
}
if (init_tag_avp(&perm_tag_avp_param) < 0) {
LM_ERR("failed to process peer_tag_avp AVP param\n");
return -1;
}
if(_perm_load_backends&PERM_LOAD_TRUSTEDDB) {
if (init_trusted() != 0) {
LM_ERR("failed to initialize the allow_trusted function\n");
return -1;
}
}
if(_perm_load_backends&PERM_LOAD_ADDRESSDB) {
if(perm_address_file_param.s!=NULL && perm_address_file_param.len>0) {
perm_address_file.s = get_pathname(perm_address_file_param.s);
if(perm_address_file.s==NULL) {
LM_ERR("failed to set full path to address file\n");
return -1;
}
perm_address_file.len = strlen(perm_address_file.s);
}
if (init_addresses() != 0) {
LM_ERR("failed to initialize the allow_address function\n");
return -1;
}
}
if ((perm_db_mode != DISABLE_CACHE) && (perm_db_mode != ENABLE_CACHE)) {
LM_ERR("invalid db_mode value: %d\n", perm_db_mode);
return -1;
}
perm_rules_num = 1;
return 0;
}
static int child_init(int rank)
{
if(_perm_load_backends&PERM_LOAD_TRUSTEDDB) {
if(init_child_trusted(rank) == -1)
return -1;
}
return 0;
}
/*
* destroy function
*/
static void mod_exit(void)
{
int i;
for(i = 0; i < perm_rules_num; i++) {
if(perm_allow[i].rules) free_rule(perm_allow[i].rules);
if(perm_allow[i].filename) pkg_free(perm_allow[i].filename);
if(perm_deny[i].rules) free_rule(perm_deny[i].rules);
if(perm_deny[i].filename) pkg_free(perm_deny[i].filename);
}
clean_trusted();
clean_addresses();
}
/*
* Uses default rule files from the module parameters
*/
int allow_routing_0(struct sip_msg* msg, char* str1, char* str2)
{
return check_routing(msg, 0);
}
int allow_routing_1(struct sip_msg* msg, char* basename, char* s)
{
return check_routing(msg, (int)(long)basename);
}
/*
* Accepts allow and deny files as parameters
*/
int allow_routing_2(struct sip_msg* msg, char* allow_file, char* deny_file)
{
/* Index converted by load_lookup */
return check_routing(msg, (int)(long)allow_file);
}
/*
* Test of REGISTER messages. Creates To-Contact pairs and compares them
* against rules in allow and deny files passed as parameters. The function
* iterates over all Contacts and creates a pair with To for each contact
* found. That allows to restrict what IPs may be used in registrations, for
* example
*/
static int check_register(struct sip_msg* msg, int idx)
{
int len;
static char to_str[EXPRESSION_LENGTH + 1];
char* contact_str;
contact_t* c;
/* turn off control, allow any routing */
if ((!perm_allow[idx].rules) && (!perm_deny[idx].rules)) {
LM_DBG("no rules => allow any registration\n");
return 1;
}
/*
* Note: We do not parse the whole header field here although the message can
* contain multiple Contact header fields. We try contacts one by one and if one
* of them causes reject then we don't look at others, this could improve performance
* a little bit in some situations
*/
if (parse_headers(msg, HDR_TO_F | HDR_CONTACT_F, 0) == -1) {
LM_ERR("failed to parse headers\n");
return -1;
}
if (!msg->to) {
LM_ERR("To or Contact not found\n");
return -1;
}
if (!msg->contact) {
/* REGISTER messages that contain no Contact header field
* are allowed. Such messages do not modify the contents of
* the user location database anyway and thus are not harmful
*/
LM_DBG("no Contact found, allowing\n");
return 1;
}
/* Check if the REGISTER message contains start Contact and if
* so then allow it
*/
if (parse_contact(msg->contact) < 0) {
LM_ERR("failed to parse Contact HF\n");
return -1;
}
if (((contact_body_t*)msg->contact->parsed)->star) {
LM_DBG("* Contact found, allowing\n");
return 1;
}
len = ((struct to_body*)msg->to->parsed)->uri.len;
if (len > EXPRESSION_LENGTH) {
LM_ERR("To header field is too long: %d chars\n", len);
return -1;
}
strncpy(to_str, ((struct to_body*)msg->to->parsed)->uri.s, len);
to_str[len] = '\0';
if (contact_iterator(&c, msg, 0) < 0) {
return -1;
}
while(c) {
contact_str = get_plain_uri(&c->uri);
if (!contact_str) {
LM_ERR("can't extract plain Contact URI\n");
return -1;
}
LM_DBG("looking for To: %s Contact: %s\n", to_str, contact_str);
/* rule exists in allow file */
if (search_rule(perm_allow[idx].rules, to_str, contact_str)) {
if (perm_check_all_branches) goto skip_deny;
}
/* rule exists in deny file */
if (search_rule(perm_deny[idx].rules, to_str, contact_str)) {
LM_DBG("deny rule found => Register denied\n");
return -1;
}
skip_deny:
if (contact_iterator(&c, msg, c) < 0) {
return -1;
}
}
LM_DBG("no contact denied => Allowed\n");
return 1;
}
int allow_register_1(struct sip_msg* msg, char* basename, char* s)
{
return check_register(msg, (int)(long)basename);
}
int allow_register_2(struct sip_msg* msg, char* allow_file, char* deny_file)
{
return check_register(msg, (int)(long)allow_file);
}
/*
* determines the permission to an uri
* return values:
* -1: deny
* 1: allow
*/
static int allow_uri(struct sip_msg* msg, char* _idx, char* _sp)
{
struct hdr_field *from;
int idx, len;
static char from_str[EXPRESSION_LENGTH+1];
static char uri_str[EXPRESSION_LENGTH+1];
pv_spec_t *sp;
pv_value_t pv_val;
idx = (int)(long)_idx;
sp = (pv_spec_t *)_sp;
/* turn off control, allow any uri */
if ((!perm_allow[idx].rules) && (!perm_deny[idx].rules)) {
LM_DBG("no rules => allow any uri\n");
return 1;
}
/* looking for FROM HF */
if ((!msg->from) && (parse_headers(msg, HDR_FROM_F, 0) == -1)) {
LM_ERR("failed to parse message\n");
return -1;
}
if (!msg->from) {
LM_ERR("FROM header field not found\n");
return -1;
}
/* we must call parse_from_header explicitly */
if ((!(msg->from)->parsed) && (parse_from_header(msg) < 0)) {
LM_ERR("failed to parse From body\n");
return -1;
}
from = msg->from;
len = ((struct to_body*)from->parsed)->uri.len;
if (len > EXPRESSION_LENGTH) {
LM_ERR("From header field is too long: %d chars\n", len);
return -1;
}
strncpy(from_str, ((struct to_body*)from->parsed)->uri.s, len);
from_str[len] = '\0';
if (sp && (pv_get_spec_value(msg, sp, &pv_val) == 0)) {
if (pv_val.flags & PV_VAL_STR) {
if (pv_val.rs.len > EXPRESSION_LENGTH) {
LM_ERR("pseudo variable value is too "
"long: %d chars\n", pv_val.rs.len);
return -1;
}
strncpy(uri_str, pv_val.rs.s, pv_val.rs.len);
uri_str[pv_val.rs.len] = '\0';
} else {
LM_ERR("pseudo variable value is not string\n");
return -1;
}
} else {
LM_ERR("cannot get pseudo variable value\n");
return -1;
}
LM_DBG("looking for From: %s URI: %s\n", from_str, uri_str);
/* rule exists in allow file */
if (search_rule(perm_allow[idx].rules, from_str, uri_str)) {
LM_DBG("allow rule found => URI is allowed\n");
return 1;
}
/* rule exists in deny file */
if (search_rule(perm_deny[idx].rules, from_str, uri_str)) {
LM_DBG("deny rule found => URI is denied\n");
return -1;
}
LM_DBG("neither allow nor deny rule found => URI is allowed\n");
return 1;
}
/*
* Test URI against Contact.
*/
int allow_test(char *file, char *uri, char *contact)
{
char *pathname;
int idx;
pathname = get_pathname(file);
if (!pathname) {
LM_ERR("Cannot get pathname of <%s>\n", file);
return 0;
}
idx = find_index(perm_allow, pathname);
if (idx == -1) {
LM_ERR("File <%s> has not been loaded\n", pathname);
pkg_free(pathname);
return 0;
}
pkg_free(pathname);
/* turn off control, allow any routing */
if ((!perm_allow[idx].rules) && (!perm_deny[idx].rules)) {
LM_DBG("No rules => Allowed\n");
return 1;
}
LM_DBG("Looking for URI: %s, Contact: %s\n", uri, contact);
/* rule exists in allow file */
if (search_rule(perm_allow[idx].rules, uri, contact)) {
LM_DBG("Allow rule found => Allowed\n");
return 1;
}
/* rule exists in deny file */
if (search_rule(perm_deny[idx].rules, uri, contact)) {
LM_DBG("Deny rule found => Denied\n");
return 0;
}
LM_DBG("Neither allow or deny rule found => Allowed\n");
return 1;
}
/**
*
*/
static int fixup_allow_address(void** param, int param_no)
{
if(param_no==1)
return fixup_igp_null(param, 1);
if(param_no==2)
return fixup_spve_null(param, 1);
if(param_no==3)
return fixup_igp_null(param, 1);
return 0;
}
static const char* rpc_trusted_reload_doc[2] = {
"Reload permissions trusted table",
0
};
static const char* rpc_address_reload_doc[2] = {
"Reload permissions address table",
0
};
static const char* rpc_trusted_dump_doc[2] = {
"Dump permissions trusted table",
0
};
static const char* rpc_address_dump_doc[2] = {
"Dump permissions address table",
0
};
static const char* rpc_subnet_dump_doc[2] = {
"Dump permissions subnet table",
0
};
static const char* rpc_domain_name_dump_doc[2] = {
"Dump permissions domain name table",
0
};
static const char* rpc_test_uri_doc[2] = {
"Tests if (URI, Contact) pair is allowed according to allow/deny files",
0
};
rpc_export_t permissions_rpc[] = {
{"permissions.trustedReload", rpc_trusted_reload, rpc_trusted_reload_doc, 0},
{"permissions.addressReload", rpc_address_reload, rpc_address_reload_doc, 0},
{"permissions.trustedDump", rpc_trusted_dump, rpc_trusted_dump_doc, 0},
{"permissions.addressDump", rpc_address_dump, rpc_address_dump_doc, RET_ARRAY},
{"permissions.subnetDump", rpc_subnet_dump, rpc_subnet_dump_doc, RET_ARRAY},
{"permissions.domainDump", rpc_domain_name_dump, rpc_domain_name_dump_doc, 0},
{"permissions.testUri", rpc_test_uri, rpc_test_uri_doc, 0},
{"permissions.allowUri", rpc_test_uri, rpc_test_uri_doc, 0},
{0, 0, 0, 0}
};
static int permissions_init_rpc(void)
{
if (rpc_register_array(permissions_rpc)!=0)
{
LM_ERR("failed to register RPC commands\n");
return -1;
}
return 0;
}
/**
*
*/
/* clang-format off */
static sr_kemi_t sr_kemi_permissions_exports[] = {
{ str_init("permissions"), str_init("allow_source_address"),
SR_KEMIP_INT, allow_source_address,
{ SR_KEMIP_INT, SR_KEMIP_NONE, SR_KEMIP_NONE,
SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
},
{ str_init("permissions"), str_init("allow_address"),
SR_KEMIP_INT, allow_address,
{ SR_KEMIP_INT, SR_KEMIP_STR, SR_KEMIP_INT,
SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
},
{ str_init("permissions"), str_init("allow_source_address_group"),
SR_KEMIP_INT, ki_allow_source_address_group,
{ SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE,
SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
},
{ str_init("permissions"), str_init("allow_address_group"),
SR_KEMIP_INT, ki_allow_address_group,
{ SR_KEMIP_STR, SR_KEMIP_INT, SR_KEMIP_NONE,
SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
},
{ str_init("permissions"), str_init("allow_trusted"),
SR_KEMIP_INT, allow_trusted_0,
{ SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE,
SR_KEMIP_NONE, SR_KEMIP_NONE, SR_KEMIP_NONE }
},
{ {0, 0}, {0, 0}, 0, NULL, { 0, 0, 0, 0, 0, 0 } }
};
/* clang-format on */
/**
*
*/
int mod_register(char *path, int *dlflags, void *p1, void *p2)
{
sr_kemi_modules_add(sr_kemi_permissions_exports);
return 0;
}