Various sorts of access control. More...
#include "asterisk.h"
#include "asterisk/network.h"
#include "asterisk/acl.h"
#include "asterisk/channel.h"
#include "asterisk/utils.h"
#include "asterisk/lock.h"
#include "asterisk/srv.h"
Go to the source code of this file.
Data Structures | |
struct | dscp_codepoint |
Functions | |
struct ast_ha * | ast_append_ha (const char *sense, const char *stuff, struct ast_ha *path, int *error) |
Add a new rule to a list of HAs. | |
int | ast_apply_ha (struct ast_ha *ha, struct sockaddr_in *sin) |
Apply a set of rules to a given IP address. | |
void | ast_copy_ha (const struct ast_ha *from, struct ast_ha *to) |
Copy the contents of one HA to another. | |
static struct ast_ha * | ast_duplicate_ha (struct ast_ha *original) |
struct ast_ha * | ast_duplicate_ha_list (struct ast_ha *original) |
Duplicate the contents of a list of host access rules. | |
int | ast_find_ourip (struct in_addr *ourip, struct sockaddr_in bindaddr) |
Find our IP address. | |
void | ast_free_ha (struct ast_ha *ha) |
Free a list of HAs. | |
int | ast_get_ip (struct sockaddr_in *sin, const char *value) |
Get the IP address given a hostname. | |
int | ast_get_ip_or_srv (struct sockaddr_in *sin, const char *value, const char *service) |
Get the IP address given a hostname and optional service. | |
int | ast_ouraddrfor (struct in_addr *them, struct in_addr *us) |
Get our local IP address when contacting a remote host. | |
int | ast_str2cos (const char *value, unsigned int *cos) |
Convert a string to the appropriate COS value. | |
int | ast_str2tos (const char *value, unsigned int *tos) |
Convert a string to the appropriate TOS value. | |
const char * | ast_tos2str (unsigned int tos) |
Convert a TOS value into its string representation. | |
static int | get_local_address (struct in_addr *ourip) |
Variables | |
static struct dscp_codepoint | dscp_pool1 [] |
Various sorts of access control.
Definition in file acl.c.
struct ast_ha* ast_append_ha | ( | const char * | sense, |
const char * | stuff, | ||
struct ast_ha * | path, | ||
int * | error | ||
) | [read] |
Add a new rule to a list of HAs.
This adds the new host access rule to the end of the list whose head is specified by the path parameter. Rules are evaluated in a way such that if multiple rules apply to a single IP address/subnet mask, then the rule latest in the list will be used.
sense | Either "permit" or "deny" (Actually any 'p' word will result in permission, and any other word will result in denial) | |
stuff | The IP address and subnet mask, separated with a '/'. The subnet mask can either be in dotted-decimal format or in CIDR notation (i.e. 0-32). | |
path | The head of the HA list to which we wish to append our new rule. If NULL is passed, then the new rule will become the head of the list | |
[out] | error | The integer error points to will be set non-zero if an error occurs |
Definition at line 272 of file acl.c.
References ast_debug, ast_free, ast_inet_ntoa(), ast_log(), ast_malloc, AST_SENSE_ALLOW, AST_SENSE_DENY, ast_strdupa, inet_aton(), LOG_WARNING, ast_ha::netaddr, ast_ha::netmask, ast_ha::next, and ast_ha::sense.
Referenced by __init_manager(), add_calltoken_ignore(), build_callno_limits(), build_device(), build_gateway(), build_peer(), build_user(), config_parse_variables(), and reload_config().
{ struct ast_ha *ha; char *nm; struct ast_ha *prev = NULL; struct ast_ha *ret; int x; char *tmp = ast_strdupa(stuff); ret = path; while (path) { prev = path; path = path->next; } if (!(ha = ast_malloc(sizeof(*ha)))) { return ret; } if (!(nm = strchr(tmp, '/'))) { /* assume /32. Yes, htonl does not do anything for this particular mask but we better use it to show we remember about byte order */ ha->netmask.s_addr = htonl(0xFFFFFFFF); } else { *nm = '\0'; nm++; if (!strchr(nm, '.')) { if ((sscanf(nm, "%30d", &x) == 1) && (x >= 0) && (x <= 32)) { if (x == 0) { /* This is special-cased to prevent unpredictable * behavior of shifting left 32 bits */ ha->netmask.s_addr = 0; } else { ha->netmask.s_addr = htonl(0xFFFFFFFF << (32 - x)); } } else { ast_log(LOG_WARNING, "Invalid CIDR in %s\n", stuff); ast_free(ha); if (error) { *error = 1; } return ret; } } else if (!inet_aton(nm, &ha->netmask)) { ast_log(LOG_WARNING, "Invalid mask in %s\n", stuff); ast_free(ha); if (error) { *error = 1; } return ret; } } if (!inet_aton(tmp, &ha->netaddr)) { ast_log(LOG_WARNING, "Invalid IP address in %s\n", stuff); ast_free(ha); if (error) { *error = 1; } return ret; } ha->netaddr.s_addr &= ha->netmask.s_addr; ha->sense = strncasecmp(sense, "p", 1) ? AST_SENSE_DENY : AST_SENSE_ALLOW; ha->next = NULL; if (prev) { prev->next = ha; } else { ret = ha; } ast_debug(1, "%s/%s sense %d appended to acl for peer\n", ast_strdupa(ast_inet_ntoa(ha->netaddr)), ast_strdupa(ast_inet_ntoa(ha->netmask)), ha->sense); return ret; }
int ast_apply_ha | ( | struct ast_ha * | ha, |
struct sockaddr_in * | sin | ||
) |
Apply a set of rules to a given IP address.
The list of host access rules is traversed, beginning with the input rule. If the IP address given matches a rule, the "sense" of that rule is used as the return value. Note that if an IP address matches multiple rules that the last one matched will be the one whose sense will be returned.
ha | The head of the list of host access rules to follow |
sin | A sockaddr_in whose address is considered when matching rules |
AST_SENSE_ALLOW | The IP address passes our ACL |
AST_SENSE_DENY | The IP address fails our ACL |
Definition at line 352 of file acl.c.
References ast_copy_string(), ast_debug, ast_inet_ntoa(), AST_SENSE_ALLOW, ast_ha::netaddr, ast_ha::netmask, ast_ha::next, and ast_ha::sense.
Referenced by ast_sip_ouraddrfor(), authenticate(), check_access(), check_peer_ok(), parse_register_contact(), register_verify(), and skinny_register().
{ /* Start optimistic */ int res = AST_SENSE_ALLOW; while (ha) { #if 0 /* debugging code */ char iabuf[INET_ADDRSTRLEN]; char iabuf2[INET_ADDRSTRLEN]; /* DEBUG */ ast_copy_string(iabuf, ast_inet_ntoa(sin->sin_addr), sizeof(iabuf)); ast_copy_string(iabuf2, ast_inet_ntoa(ha->netaddr), sizeof(iabuf2)); ast_debug(1, "##### Testing %s with %s\n", iabuf, iabuf2); #endif /* For each rule, if this address and the netmask = the net address apply the current rule */ if ((sin->sin_addr.s_addr & ha->netmask.s_addr) == ha->netaddr.s_addr) { res = ha->sense; } ha = ha->next; } return res; }
Copy the contents of one HA to another.
This copies the internals of the 'from' HA to the 'to' HA. It is important that the 'to' HA has been allocated prior to calling this function
from | Source HA to copy |
to | Destination HA to copy to |
void |
Definition at line 228 of file acl.c.
References ast_ha::netaddr, ast_ha::netmask, and ast_ha::sense.
Referenced by add_calltoken_ignore(), ast_duplicate_ha(), and build_callno_limits().
Definition at line 236 of file acl.c.
References ast_copy_ha(), and ast_malloc.
Referenced by ast_duplicate_ha_list().
{ struct ast_ha *new_ha; if ((new_ha = ast_malloc(sizeof(*new_ha)))) { /* Copy from original to new object */ ast_copy_ha(original, new_ha); } return new_ha; }
Duplicate the contents of a list of host access rules.
A deep copy of all ast_has in the list is made. The returned value is allocated on the heap and must be freed independently of the input parameter when finished.
original | The ast_ha to copy |
The | head of the list of duplicated ast_has |
Definition at line 250 of file acl.c.
References ast_duplicate_ha(), and ast_ha::next.
{ struct ast_ha *start = original; struct ast_ha *ret = NULL; struct ast_ha *current, *prev = NULL; while (start) { current = ast_duplicate_ha(start); /* Create copy of this object */ if (prev) { prev->next = current; /* Link previous to this object */ } if (!ret) { ret = current; /* Save starting point */ } start = start->next; /* Go to next object */ prev = current; /* Save pointer to this object */ } return ret; /* Return start of list */ }
int ast_find_ourip | ( | struct in_addr * | ourip, |
struct sockaddr_in | bindaddr | ||
) |
Find our IP address.
This function goes through many iterations in an attempt to find our IP address. If any step along the way should fail, we move to the next item in the list. Here are the steps taken:
[out] | ourip | Our IP address is written here when it is found |
bindaddr | A hint used for finding our IP. See the steps above for more details |
0 | Success |
-1 | Failure |
Definition at line 512 of file acl.c.
References ast_debug, ast_gethostbyname(), ast_log(), ast_ouraddrfor(), get_local_address(), hp, inet_aton(), LOG_WARNING, MAXHOSTNAMELEN, and ourhost.
Referenced by __oh323_rtp_create(), gtalk_create_candidates(), jingle_create_candidates(), load_module(), and reload_config().
{ char ourhost[MAXHOSTNAMELEN] = ""; struct ast_hostent ahp; struct hostent *hp; struct in_addr saddr; /* just use the bind address if it is nonzero */ if (ntohl(bindaddr.sin_addr.s_addr)) { memcpy(ourip, &bindaddr.sin_addr, sizeof(*ourip)); ast_debug(3, "Attached to given IP address\n"); return 0; } /* try to use our hostname */ if (gethostname(ourhost, sizeof(ourhost) - 1)) { ast_log(LOG_WARNING, "Unable to get hostname\n"); } else { if ((hp = ast_gethostbyname(ourhost, &ahp))) { memcpy(ourip, hp->h_addr, sizeof(*ourip)); ast_debug(3, "Found one IP address based on local hostname %s.\n", ourhost); return 0; } } ast_debug(3, "Trying to check A.ROOT-SERVERS.NET and get our IP address for that connection\n"); /* A.ROOT-SERVERS.NET. */ if (inet_aton("198.41.0.4", &saddr) && !ast_ouraddrfor(&saddr, ourip)) { return 0; } return get_local_address(ourip); }
void ast_free_ha | ( | struct ast_ha * | ha | ) |
Free a list of HAs.
Given the head of a list of HAs, it and all appended HAs are freed
ha | The head of the list of HAs to free |
void |
Definition at line 217 of file acl.c.
References ast_free, and ast_ha::next.
Referenced by __init_manager(), add_calltoken_ignore(), build_callno_limits(), build_peer(), build_user(), destroy_gateway(), oh323_destroy_peer(), oh323_destroy_user(), peer_destructor(), reload_config(), sip_destroy_peer(), unload_module(), and user_destructor().
int ast_get_ip | ( | struct sockaddr_in * | sin, |
const char * | value | ||
) |
Get the IP address given a hostname.
Similar in nature to ast_gethostbyname, except that instead of getting an entire hostent structure, you instead are given only the IP address inserted into a sockaddr_in structure.
[out] | sin | The IP address is written into sin->sin_addr |
value | The hostname to look up |
0 | Success |
-1 | Failure |
Definition at line 477 of file acl.c.
References ast_get_ip_or_srv().
Referenced by build_gateway(), build_peer(), build_user(), config_parse_variables(), and peer_set_srcaddr().
{ return ast_get_ip_or_srv(sin, value, NULL); }
int ast_get_ip_or_srv | ( | struct sockaddr_in * | sin, |
const char * | value, | ||
const char * | service | ||
) |
Get the IP address given a hostname and optional service.
If the service parameter is non-NULL, then an SRV lookup will be made by prepending the service to the value parameter, separated by a '.' For example, if value is "example.com" and service is "_sip._udp" then an SRV lookup will be done for "_sip._udp.example.com". If service is NULL, then this function acts exactly like a call to ast_get_ip.
[out] | sin | The IP address is written into sin->sin_addr |
value | The hostname to look up | |
service | A specific service provided by the host. A NULL service results in an A-record lookup instead of an SRV lookup |
0 | Success |
-1 | Failure |
Definition at line 375 of file acl.c.
References ast_get_srv(), ast_gethostbyname(), ast_log(), hp, and LOG_WARNING.
Referenced by ast_dnsmgr_lookup(), ast_get_ip(), create_addr(), dnsmgr_refresh(), and proxy_update().
{ struct hostent *hp; struct ast_hostent ahp; char srv[256]; char host[256]; int tportno = ntohs(sin->sin_port); if (service) { snprintf(srv, sizeof(srv), "%s.%s", service, value); if (ast_get_srv(NULL, host, sizeof(host), &tportno, srv) > 0) { sin->sin_port = htons(tportno); value = host; } } if ((hp = ast_gethostbyname(value, &ahp))) { sin->sin_family = hp->h_addrtype; memcpy(&sin->sin_addr, hp->h_addr, sizeof(sin->sin_addr)); } else { ast_log(LOG_WARNING, "Unable to lookup '%s'\n", value); return -1; } return 0; }
int ast_ouraddrfor | ( | struct in_addr * | them, |
struct in_addr * | us | ||
) |
Get our local IP address when contacting a remote host.
This function will attempt to connect(2) to them over UDP using a source port of 5060. If the connect(2) call is successful, then we inspect the sockaddr_in output parameter of connect(2) to determine the IP address used to connect to them. This IP address is then copied into us.
them | The IP address to which we wish to attempt to connect | |
[out] | us | The source IP address used to connect to them |
-1 | Failure |
0 | Success |
Definition at line 482 of file acl.c.
References ast_debug, ast_log(), LOG_ERROR, LOG_WARNING, and s.
Referenced by ast_find_ourip(), ast_sip_ouraddrfor(), build_gateway(), and find_subchannel_and_lock().
{ int s; struct sockaddr_in sin; socklen_t slen; if ((s = socket(PF_INET, SOCK_DGRAM, 0)) < 0) { ast_log(LOG_ERROR, "Cannot create socket\n"); return -1; } sin.sin_family = AF_INET; sin.sin_port = htons(5060); sin.sin_addr = *them; if (connect(s, (struct sockaddr *)&sin, sizeof(sin))) { ast_log(LOG_WARNING, "Cannot connect\n"); close(s); return -1; } slen = sizeof(sin); if (getsockname(s, (struct sockaddr *)&sin, &slen)) { ast_log(LOG_WARNING, "Cannot get socket name\n"); close(s); return -1; } close(s); ast_debug(3, "Found IP address for this socket\n"); *us = sin.sin_addr; return 0; }
int ast_str2cos | ( | const char * | value, |
unsigned int * | cos | ||
) |
Convert a string to the appropriate COS value.
value | The COS string to convert | |
[out] | cos | The integer representation of that COS value |
-1 | Failure |
0 | Success |
Definition at line 430 of file acl.c.
Referenced by config_parse_variables(), reload_config(), and set_config().
{ int fval; if (sscanf(value, "%30d", &fval) == 1) { if (fval < 8) { *cos = fval; return 0; } } return -1; }
int ast_str2tos | ( | const char * | value, |
unsigned int * | tos | ||
) |
Convert a string to the appropriate TOS value.
value | The TOS string to convert | |
[out] | tos | The integer representation of that TOS value |
-1 | Failure |
0 | Success |
Definition at line 444 of file acl.c.
References ARRAY_LEN, name, and dscp_codepoint::space.
Referenced by config_parse_variables(), iax_template_parse(), reload_config(), and set_config().
{ int fval; unsigned int x; if (sscanf(value, "%30i", &fval) == 1) { *tos = fval & 0xFF; return 0; } for (x = 0; x < ARRAY_LEN(dscp_pool1); x++) { if (!strcasecmp(value, dscp_pool1[x].name)) { *tos = dscp_pool1[x].space << 2; return 0; } } return -1; }
const char* ast_tos2str | ( | unsigned int | tos | ) |
Convert a TOS value into its string representation.
tos | The TOS value to look up |
Definition at line 464 of file acl.c.
References ARRAY_LEN, dscp_codepoint::name, and dscp_codepoint::space.
Referenced by sip_show_settings().
{ unsigned int x; for (x = 0; x < ARRAY_LEN(dscp_pool1); x++) { if (dscp_pool1[x].space == (tos >> 2)) { return dscp_pool1[x].name; } } return "unknown"; }
static int get_local_address | ( | struct in_addr * | ourip | ) | [static] |
struct dscp_codepoint dscp_pool1[] [static] |