1 files changed, 134 insertions, 0 deletions
diff --git a/accel-pptpd/auth_pap.c b/accel-pptpd/auth_pap.c
new file mode 100644
index 00000000..42a70f50
--- /dev/null
+++ b/accel-pptpd/auth_pap.c
@@ -0,0 +1,134 @@
+#include "log.h"
+#include "ppp_auth.h"
+
+static int lcp_get_conf_req(struct auth_driver_t*, struct ppp_layer_t*, struct lcp_opt32_t*);
+static int lcp_recv_conf_req(struct auth_driver_t*, struct ppp_layer_t*, struct lcp_opt32_t*);
+static int lcp_conf_established(struct auth_driver_t*, struct ppp_layer_t*);
+static void pap_recv(struct ppp_handler_t*h);
+
+struct pap_proto_t
+{
+	struct ppp_handler_t h;
+	struct ppp_t *ppp;
+	struct ppp_layer_t *lcp;
+};
+
+struct pap_hdr_t
+{
+	uint8_t code;
+	uint8_t id;
+	uint16_t len;
+} __attribute__((packed));
+
+static struct auth_driver_t pap=
+{
+	.type=PPP_PAP,
+	.get_conf_req=lcp_get_conf_req,
+	.recv_conf_req=lcp_recv_conf_req,
+	.established=lcp_established,
+};
+
+
+int plugin_init(void)
+{
+	if (auth_register(&pap))
+	{
+		log_error("pap: failed to register driver\n");
+		return -1;
+	}
+
+	return 0;
+}
+
+static int lcp_established(struct auth_driver_t*d, struct ppp_layer_t*lcp)
+{
+	struct pap_proto_t *p=malloc(sizeof(*l));
+
+	memset(&p,0,sizeof(*l));
+	p->h.proto=PPP_PAP;
+	p->h.recv=pap_recv;
+	p->ppp=lcp->ppp;
+	p->lcp=lcp;
+
+	ppp_register_handler(p->ppp,p->h);
+}
+
+static int lcp_get_conf_req(struct auth_driver_t*, struct ppp_layer_t*, struct lcp_opt32_t*)
+{
+}
+
+static int lcp_recv_conf_req(struct auth_driver_t*, struct ppp_layer_t*, struct lcp_opt32_t*)
+{
+}
+
+static void pap_send_nack(struct pap_proto_t *p,struct pap_hdr_t *hdr)
+{
+
+}
+
+static int pap_recv_req(struct pap_proto_t *p,struct pap_hdr_t *hdr)
+{
+	int ret;
+	char *peer_id;
+	char *passwd;
+	int peer_id_len;
+	int passwd_len;
+	uint8_t *ptr=(uint8_t*)(hdr+1);
+	
+	peer_id_len=*(uint8_t*)ptr; ptr++;
+	if (peer_id_len>htons(hdr->len)-sizeof(*hdr)-1)
+	{
+		log_warn("PAP: short packet received\n");
+		return -1;
+	}
+	peer_id=ptr; ptr+=peer_id_len;
+
+	passwd_len=*(uint8_t*)ptr; ptr++;
+	if (passwd_len>htons(hdr->len)-sizeof(*hdr)-2-peer_id_len)
+	{
+		log_warn("PAP: short packet received\n");
+		return -1;
+	}
+
+	peer_id=stdndup(peer_id,peer_id_len);
+	passwd=stdndup(ptr,passwd_len);
+
+	if (pwdb_check(peer_id,passwd))
+	{
+		log_warn("PAP: authentication error\n");
+		pap_send_nack(p,hdr);
+		ret=-1;
+	}else ret=0;
+
+	free(peer_id);
+	free(passwd);
+
+	pap_send_ack(p,hdr);
+	return 0;
+}
+
+static void pap_recv(struct ppp_handler_t*h)
+{
+	struct pap_proto_t *p=container_of(h,typeof(*p),h);
+	struct pap_hdr_t *hdr;
+
+	if (p->ppp->in_buf_size<sizeof(*hdr)+2 || htons(hdr->len)<sizeof(*hdr) || htons(hdr->len)<p->ppp->in_buf_size-2)
+	{
+		log_warn("PAP: short packet received\n");
+		return;
+	}
+
+	hdr=(struct pap_hdr_t *)p->ppp->in_buf;
+	if (ntohs(hdr->len)<sizeof(*hdr) ||)
+	{
+		log_warn("PAP: short packet received\n");
+		return;
+	}
+
+	if (hdr->code==PAP_REQ) pap_recv_req(p,hdr);
+	else
+	{
+		log_warn("PAP: unknown code received %x\n",hdr->code);
+	}
+}
+