Thu Apr 8 01:21:03 2010

Asterisk developer's documentation

acl.c File Reference

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"
Include dependency graph for acl.c:

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)
 Append ACL entry to host access list.
int ast_apply_ha (struct ast_ha *ha, struct sockaddr_in *sin)
 Check IP address with host access list.
void ast_copy_ha (const struct ast_ha *from, struct ast_ha *to)
 Copy ha structure.
static struct ast_ha * ast_duplicate_ha (struct ast_ha *original)
struct ast_ha * ast_duplicate_ha_list (struct ast_ha *original)
 Copy host access list.
int ast_find_ourip (struct in_addr *ourip, struct sockaddr_in bindaddr)
void ast_free_ha (struct ast_ha *ha)
 Free host access list.
int ast_get_ip (struct sockaddr_in *sin, const char *value)
int ast_get_ip_or_srv (struct sockaddr_in *sin, const char *value, const char *service)
int ast_ouraddrfor (struct in_addr *them, struct in_addr *us)
int ast_str2cos (const char *value, unsigned int *cos)
int ast_str2tos (const char *value, unsigned int *tos)
const char * ast_tos2str (unsigned int tos)
static int get_local_address (struct in_addr *ourip)

Variables

static struct dscp_codepoint dscp_pool1 []

Detailed Description

Various sorts of access control.

Author:
Mark Spencer <markster@digium.com>

Definition in file acl.c.

Function Documentation

struct ast_ha* ast_append_ha ( const char *  sense,
const char *  stuff,
struct ast_ha *  path,
int *  error 
) [read]

Append ACL entry to host access list.

Definition at line 265 of file acl.c.

References ast_debug, ast_free, ast_inet_ntoa(), ast_log(), ast_malloc, AST_SENSE_ALLOW, AST_SENSE_DENY, ast_strdupa, 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(), and reload_config().

00266 {
00267    struct ast_ha *ha;
00268    char *nm;
00269    struct ast_ha *prev = NULL;
00270    struct ast_ha *ret;
00271    int x;
00272    char *tmp = ast_strdupa(stuff);
00273 
00274    ret = path;
00275    while (path) {
00276       prev = path;
00277       path = path->next;
00278    }
00279 
00280    ha = ast_malloc(sizeof(*ha));
00281    if (!ha)
00282       return ret;
00283 
00284    nm = strchr(tmp, '/');
00285    if (!nm) {
00286       /* assume /32. Yes, htonl does not do anything for this particular mask
00287          but we better use it to show we remember about byte order */
00288       ha->netmask.s_addr = htonl(0xFFFFFFFF);
00289    } else {
00290       *nm = '\0';
00291       nm++;
00292 
00293       if (!strchr(nm, '.')) {
00294          if ((sscanf(nm, "%30d", &x) == 1) && (x >= 0) && (x <= 32))
00295             if (x == 0) {
00296                /* This is special-cased to prevent unpredictable
00297                 * behavior of shifting left 32 bits
00298                 */
00299                ha->netmask.s_addr = 0;
00300             } else {
00301                ha->netmask.s_addr = htonl(0xFFFFFFFF << (32 - x));
00302             }
00303          else {
00304             ast_log(LOG_WARNING, "Invalid CIDR in %s\n", stuff);
00305             ast_free(ha);
00306             if (error)
00307                *error = 1;
00308             return ret;
00309          }
00310       } else if (!inet_aton(nm, &ha->netmask)) {
00311          ast_log(LOG_WARNING, "Invalid mask in %s\n", stuff);
00312          ast_free(ha);
00313          if (error)
00314             *error = 1;
00315          return ret;
00316       }
00317    }
00318 
00319    if (!inet_aton(tmp, &ha->netaddr)) {
00320       ast_log(LOG_WARNING, "Invalid IP address in %s\n", stuff);
00321       ast_free(ha);
00322       if (error)
00323          *error = 1;
00324       return ret;
00325    }
00326 
00327    ha->netaddr.s_addr &= ha->netmask.s_addr;
00328 
00329    ha->sense = strncasecmp(sense, "p", 1) ? AST_SENSE_DENY : AST_SENSE_ALLOW;
00330 
00331    ha->next = NULL;
00332    if (prev) {
00333       prev->next = ha;
00334    } else {
00335       ret = ha;
00336    }
00337 
00338    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);
00339 
00340    return ret;
00341 }

int ast_apply_ha ( struct ast_ha *  ha,
struct sockaddr_in *  sin 
)

Check IP address with host access list.

Definition at line 343 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().

00344 {
00345    /* Start optimistic */
00346    int res = AST_SENSE_ALLOW;
00347    while (ha) {
00348 #if 0 /* debugging code */
00349       char iabuf[INET_ADDRSTRLEN];
00350       char iabuf2[INET_ADDRSTRLEN];
00351       /* DEBUG */
00352       ast_copy_string(iabuf, ast_inet_ntoa(sin->sin_addr), sizeof(iabuf));
00353       ast_copy_string(iabuf2, ast_inet_ntoa(ha->netaddr), sizeof(iabuf2));
00354       ast_debug(1, "##### Testing %s with %s\n", iabuf, iabuf2);
00355 #endif
00356       /* For each rule, if this address and the netmask = the net address
00357          apply the current rule */
00358       if ((sin->sin_addr.s_addr & ha->netmask.s_addr) == ha->netaddr.s_addr)
00359          res = ha->sense;
00360       ha = ha->next;
00361    }
00362    return res;
00363 }

void ast_copy_ha ( const struct ast_ha *  from,
struct ast_ha *  to 
)

Copy ha structure.

Definition at line 223 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().

00224 {
00225    memcpy(&to->netaddr, &from->netaddr, sizeof(from->netaddr));
00226    memcpy(&to->netmask, &from->netmask, sizeof(from->netmask));
00227    to->sense = from->sense;
00228 }

static struct ast_ha* ast_duplicate_ha ( struct ast_ha *  original  )  [static, read]

Definition at line 231 of file acl.c.

References ast_copy_ha(), and ast_malloc.

Referenced by ast_duplicate_ha_list().

00232 {
00233    struct ast_ha *new_ha;
00234 
00235    if ((new_ha = ast_malloc(sizeof(*new_ha)))) {
00236       /* Copy from original to new object */
00237       ast_copy_ha(original, new_ha);
00238    }
00239 
00240    return new_ha;
00241 }

struct ast_ha* ast_duplicate_ha_list ( struct ast_ha *  original  )  [read]

Copy host access list.

Definition at line 245 of file acl.c.

References ast_duplicate_ha(), and ast_ha::next.

00246 {
00247    struct ast_ha *start = original;
00248    struct ast_ha *ret = NULL;
00249    struct ast_ha *current, *prev = NULL;
00250 
00251    while (start) {
00252       current = ast_duplicate_ha(start);  /* Create copy of this object */
00253       if (prev)
00254          prev->next = current;      /* Link previous to this object */
00255 
00256       if (!ret)
00257          ret = current;    /* Save starting point */
00258 
00259       start = start->next;    /* Go to next object */
00260       prev = current;         /* Save pointer to this object */
00261    }
00262    return ret;             /* Return start of list */
00263 }

int ast_find_ourip ( struct in_addr *  ourip,
struct sockaddr_in  bindaddr 
)

Definition at line 502 of file acl.c.

References ast_debug, ast_gethostbyname(), ast_log(), ast_ouraddrfor(), get_local_address(), hp, LOG_WARNING, MAXHOSTNAMELEN, and ourhost.

Referenced by __oh323_rtp_create(), gtalk_create_candidates(), jingle_create_candidates(), load_module(), and reload_config().

00503 {
00504    char ourhost[MAXHOSTNAMELEN] = "";
00505    struct ast_hostent ahp;
00506    struct hostent *hp;
00507    struct in_addr saddr;
00508 
00509    /* just use the bind address if it is nonzero */
00510    if (ntohl(bindaddr.sin_addr.s_addr)) {
00511       memcpy(ourip, &bindaddr.sin_addr, sizeof(*ourip));
00512       ast_debug(3, "Attached to given IP address\n");
00513       return 0;
00514    }
00515    /* try to use our hostname */
00516    if (gethostname(ourhost, sizeof(ourhost) - 1)) {
00517       ast_log(LOG_WARNING, "Unable to get hostname\n");
00518    } else {
00519       hp = ast_gethostbyname(ourhost, &ahp);
00520       if (hp) {
00521          memcpy(ourip, hp->h_addr, sizeof(*ourip));
00522          ast_debug(3, "Found one IP address based on local hostname %s.\n", ourhost);
00523          return 0;
00524       }
00525    }
00526    ast_debug(3, "Trying to check A.ROOT-SERVERS.NET and get our IP address for that connection\n");
00527    /* A.ROOT-SERVERS.NET. */
00528    if (inet_aton("198.41.0.4", &saddr) && !ast_ouraddrfor(&saddr, ourip))
00529       return 0;
00530    return get_local_address(ourip);
00531 }

void ast_free_ha ( struct ast_ha *  ha  ) 

Free host access list.

Definition at line 212 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().

00213 {
00214    struct ast_ha *hal;
00215    while (ha) {
00216       hal = ha;
00217       ha = ha->next;
00218       ast_free(hal);
00219    }
00220 }

int ast_get_ip ( struct sockaddr_in *  sin,
const char *  value 
)

Definition at line 466 of file acl.c.

References ast_get_ip_or_srv().

Referenced by build_device(), build_gateway(), build_peer(), build_user(), and peer_set_srcaddr().

00467 {
00468    return ast_get_ip_or_srv(sin, value, NULL);
00469 }

int ast_get_ip_or_srv ( struct sockaddr_in *  sin,
const char *  value,
const char *  service 
)

Definition at line 365 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().

00366 {
00367    struct hostent *hp;
00368    struct ast_hostent ahp;
00369    char srv[256];
00370    char host[256];
00371    int tportno = ntohs(sin->sin_port);
00372    if (service) {
00373       snprintf(srv, sizeof(srv), "%s.%s", service, value);
00374       if (ast_get_srv(NULL, host, sizeof(host), &tportno, srv) > 0) {
00375          sin->sin_port = htons(tportno);
00376          value = host;
00377       }
00378    }
00379    hp = ast_gethostbyname(value, &ahp);
00380    if (hp) {
00381       memcpy(&sin->sin_addr, hp->h_addr, sizeof(sin->sin_addr));
00382    } else {
00383       ast_log(LOG_WARNING, "Unable to lookup '%s'\n", value);
00384       return -1;
00385    }
00386    return 0;
00387 }

int ast_ouraddrfor ( struct in_addr *  them,
struct in_addr *  us 
)

Definition at line 471 of file acl.c.

References ast_debug, ast_log(), LOG_ERROR, and LOG_WARNING.

Referenced by ast_find_ourip(), ast_sip_ouraddrfor(), build_gateway(), and find_subchannel_and_lock().

00472 {
00473    int s;
00474    struct sockaddr_in sin;
00475    socklen_t slen;
00476 
00477    s = socket(PF_INET, SOCK_DGRAM, 0);
00478    if (s < 0) {
00479       ast_log(LOG_ERROR, "Cannot create socket\n");
00480       return -1;
00481    }
00482    sin.sin_family = AF_INET;
00483    sin.sin_port = htons(5060);
00484    sin.sin_addr = *them;
00485    if (connect(s, (struct sockaddr *)&sin, sizeof(sin))) {
00486       ast_log(LOG_WARNING, "Cannot connect\n");
00487       close(s);
00488       return -1;
00489    }
00490    slen = sizeof(sin);
00491    if (getsockname(s, (struct sockaddr *)&sin, &slen)) {
00492       ast_log(LOG_WARNING, "Cannot get socket name\n");
00493       close(s);
00494       return -1;
00495    }
00496    close(s);
00497    ast_debug(3, "Found IP address for this socket\n");
00498    *us = sin.sin_addr;
00499    return 0;
00500 }

int ast_str2cos ( const char *  value,
unsigned int *  cos 
)

Definition at line 420 of file acl.c.

Referenced by reload_config(), and set_config().

00421 {
00422    int fval;
00423 
00424    if (sscanf(value, "%30d", &fval) == 1) {
00425       if (fval < 8) {
00426           *cos = fval;
00427           return 0;
00428       }
00429    }
00430 
00431    return -1;
00432 }

int ast_str2tos ( const char *  value,
unsigned int *  tos 
)

Definition at line 434 of file acl.c.

References ARRAY_LEN, name, and dscp_codepoint::space.

Referenced by iax_template_parse(), reload_config(), and set_config().

00435 {
00436    int fval;
00437    unsigned int x;
00438 
00439    if (sscanf(value, "%30i", &fval) == 1) {
00440       *tos = fval & 0xFF;
00441       return 0;
00442    }
00443 
00444    for (x = 0; x < ARRAY_LEN(dscp_pool1); x++) {
00445       if (!strcasecmp(value, dscp_pool1[x].name)) {
00446          *tos = dscp_pool1[x].space << 2;
00447          return 0;
00448       }
00449    }
00450 
00451    return -1;
00452 }

const char* ast_tos2str ( unsigned int  tos  ) 

Definition at line 454 of file acl.c.

References ARRAY_LEN, name, and dscp_codepoint::space.

Referenced by sip_show_settings().

00455 {
00456    unsigned int x;
00457 
00458    for (x = 0; x < ARRAY_LEN(dscp_pool1); x++) {
00459       if (dscp_pool1[x].space == (tos >> 2))
00460          return dscp_pool1[x].name;
00461    }
00462 
00463    return "unknown";
00464 }

static int get_local_address ( struct in_addr *  ourip  )  [static]

Definition at line 51 of file acl.c.

Referenced by ast_find_ourip().

00052 {
00053    return -1;
00054 }

Variable Documentation

struct dscp_codepoint dscp_pool1[] [static]

Definition at line 396 of file acl.c.

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