sgsn: add a minimalistic ACL
This adds a minimalistic ACL by which certain, individual roaming IMSIs can be authorized to use the SGSN. So you can selectively bypass the 'MCC+MNC == first 5 digits of IMSI' checking for a couple of IMSIs
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@ -15,6 +15,8 @@ struct sgsn_config {
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/* misc */
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struct gprs_ns_inst *nsi;
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struct llist_head imsi_acl;
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};
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struct sgsn_instance {
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@ -698,7 +698,8 @@ static int gsm48_rx_gmm_att_req(struct sgsn_mm_ctx *ctx, struct msgb *msg,
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* as long as it is part of 'our' network */
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char mccmnc[16];
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snprintf(mccmnc, sizeof(mccmnc), "%03d%02d", ra_id.mcc, ra_id.mnc);
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if (strncmp(mccmnc, mi_string, 5)) {
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if (strncmp(mccmnc, mi_string, 5) &&
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!sgsn_acl_lookup(mi_string)) {
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LOGP(DMM, LOGL_INFO, "Rejecting ATTACH REQUESET IMSI=%s\n",
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mi_string);
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return gsm48_tx_gmm_att_rej_oldmsg(msg,
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@ -75,6 +75,7 @@ static struct sgsn_instance sgsn_inst = {
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.config_file = "osmo_sgsn.cfg",
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.cfg = {
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.gtp_statedir = "./",
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.acl_enabled = 1,
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},
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};
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struct sgsn_instance *sgsn = &sgsn_inst;
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@ -1,5 +1,5 @@
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/*
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* (C) 2010 by Harald Welte <laforge@gnumonks.org>
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* (C) 2010-2013 by Harald Welte <laforge@gnumonks.org>
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* (C) 2010 by On-Waves
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* All Rights Reserved
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*
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@ -41,6 +41,10 @@
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static struct sgsn_config *g_cfg = NULL;
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struct imsi_acl_entry {
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struct llist_head list;
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char imsi[16+1];
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};
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#define GSM48_MAX_APN_LEN 102 /* 10.5.6.1 */
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static char *gprs_apn2str(uint8_t *apn, unsigned int len)
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@ -113,6 +117,7 @@ static struct cmd_node sgsn_node = {
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static int config_write_sgsn(struct vty *vty)
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{
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struct sgsn_ggsn_ctx *gctx;
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struct imsi_acl_entry *acl;
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vty_out(vty, "sgsn%s", VTY_NEWLINE);
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@ -126,6 +131,9 @@ static int config_write_sgsn(struct vty *vty)
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gctx->gtp_version, VTY_NEWLINE);
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}
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llist_for_each_entry(acl, &g_cfg->imsi_acl, list)
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vty_out(vty, " imsi-acl add %s%s", acl->imsi, VTY_NEWLINE);
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return CMD_SUCCESS;
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}
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@ -317,6 +325,73 @@ DEFUN(show_pdpctx_all, show_pdpctx_all_cmd,
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return CMD_SUCCESS;
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}
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/* temporary IMSI ACL hack */
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struct imsi_acl_entry *sgsn_acl_lookup(const char *imsi)
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{
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struct imsi_acl_entry *acl;
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llist_for_each_entry(acl, &g_cfg->imsi_acl, list) {
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if (!strcmp(imsi, acl->imsi))
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return acl;
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}
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return NULL;
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}
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int sgsn_acl_add(const char *imsi)
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{
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struct imsi_acl_entry *acl;
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if (sgsn_acl_lookup(imsi))
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return -EEXIST;
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acl = talloc_zero(NULL, struct imsi_acl_entry);
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if (!acl)
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return -ENOMEM;
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strncpy(acl->imsi, imsi, sizeof(acl->imsi));
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llist_add(&acl->list, &g_cfg->imsi_acl);
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return 0;
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}
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int sgsn_acl_del(const char *imsi)
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{
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struct imsi_acl_entry *acl;
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acl = sgsn_acl_lookup(imsi);
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if (!acl)
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return -ENODEV;
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llist_del(&acl->list);
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talloc_free(acl);
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return 0;
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}
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DEFUN(imsi_acl, cfg_imsi_acl_cmd,
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"imsi-acl (add|del) IMSI",
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"Access Control List of foreign IMSIs\n"
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"Add IMSI to ACL\n"
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"Remove IMSI from ACL\n"
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"IMSI of subscriber\n")
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{
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const char *op = argv[0];
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const char *imsi = argv[1];
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int rc;
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if (!strcmp(op, "add"))
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rc = sgsn_acl_add(imsi);
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else
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rc = sgsn_acl_del(imsi);
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if (rc < 0) {
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vty_out(vty, "%% unable to %s ACL\n", op);
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return CMD_WARNING;
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}
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return CMD_SUCCESS;
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}
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int sgsn_vty_init(void)
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{
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install_element_ve(&show_sgsn_cmd);
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@ -334,6 +409,7 @@ int sgsn_vty_init(void)
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install_element(SGSN_NODE, &cfg_ggsn_remote_ip_cmd);
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//install_element(SGSN_NODE, &cfg_ggsn_remote_port_cmd);
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install_element(SGSN_NODE, &cfg_ggsn_gtp_version_cmd);
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install_element(SGSN_NODE, &cfg_imsi_acl_cmd);
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return 0;
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}
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@ -343,6 +419,8 @@ int sgsn_parse_config(const char *config_file, struct sgsn_config *cfg)
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int rc;
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g_cfg = cfg;
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INIT_LLIST_HEAD(&g_cfg->imsi_acl);
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rc = vty_read_config_file(config_file, NULL);
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if (rc < 0) {
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fprintf(stderr, "Failed to parse the config file: '%s'\n", config_file);
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