/
pulse.c
2938 lines (2543 loc) · 85.3 KB
/
pulse.c
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/*
* OpenConnect (SSL + DTLS) VPN client
*
* Copyright © 2019 David Woodhouse.
*
* Author: David Woodhouse <dwmw2@infradead.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1, as published by the Free Software Foundation.
*
* This program 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
* Lesser General Public License for more details.
*/
#include <config.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <stdarg.h>
#include <sys/types.h>
#include "openconnect-internal.h"
#define VENDOR_JUNIPER 0xa4c
#define VENDOR_JUNIPER2 0x583
#define VENDOR_TCG 0x5597
#define IFT_VERSION_REQUEST 1
#define IFT_VERSION_RESPONSE 2
#define IFT_CLIENT_AUTH_REQUEST 3
#define IFT_CLIENT_AUTH_SELECTION 4
#define IFT_CLIENT_AUTH_CHALLENGE 5
#define IFT_CLIENT_AUTH_RESPONSE 6
#define IFT_CLIENT_AUTH_SUCCESS 7
/* IF-T/TLS v1 authentication messages all start
* with the Auth Type Vendor (Juniper) + Type (1) */
#define JUNIPER_1 ((VENDOR_JUNIPER << 8) | 1)
#define AVP_VENDOR 0x80
#define AVP_MANDATORY 0x40
#define EAP_REQUEST 1
#define EAP_RESPONSE 2
#define EAP_SUCCESS 3
#define EAP_FAILURE 4
#define EAP_TYPE_IDENTITY 1
#define EAP_TYPE_GTC 6
#define EAP_TYPE_TLS 0x0d
#define EAP_TYPE_TTLS 0x15
#define EAP_TYPE_EXPANDED 0xfe
#define EXPANDED_JUNIPER ((EAP_TYPE_EXPANDED << 24) | VENDOR_JUNIPER)
#define AVP_CODE_EAP_MESSAGE 79
#if defined(OPENCONNECT_OPENSSL)
#define TTLS_SEND SSL_write
#define TTLS_RECV SSL_read
#elif defined(OPENCONNECT_GNUTLS)
#define TTLS_SEND gnutls_record_send
#define TTLS_RECV gnutls_record_recv
#endif
/* Flags for prompt handling during authentication, based on the contents of the 0xd73 AVP (qv). */
#define PROMPT_PRIMARY 1
#define PROMPT_USERNAME 2
#define PROMPT_PASSWORD 4
#define PROMPT_GTC_NEXT 0x10000
/* Request codes for the Juniper Expanded/2 auth requests. */
#define J2_PASSCHANGE 0x43
#define J2_PASSREQ 0x01
#define J2_PASSRETRY 0x81
#define J2_PASSFAIL 0xc5
/* Limit to TLS record size. */
#define TLS_RECORD_MAX (16384)
/* Outbound fragment size limit */
#define TTLS_MAXFRAG (8192)
#define TTLS_LENGTH (1<<7)
#define TTLS_MOREFRAGS (1<<6)
#define TTLS_START (1<<5)
static void buf_append_be16(struct oc_text_buf *buf, uint16_t val)
{
unsigned char b[2];
store_be16(b, val);
buf_append_bytes(buf, b, 2);
}
static void buf_append_be32(struct oc_text_buf *buf, uint32_t val)
{
unsigned char b[4];
store_be32(b, val);
buf_append_bytes(buf, b, 4);
}
static void buf_append_ift_hdr(struct oc_text_buf *buf, uint32_t vendor, uint32_t type)
{
uint32_t b[4];
store_be32(&b[0], vendor);
store_be32(&b[1], type);
b[2] = 0; /* Length will be filled in later. */
b[3] = 0;
buf_append_bytes(buf, b, 16);
}
/* Append EAP header, using VENDOR_JUNIPER and the given subtype if
* the main type is EAP_TYPE_EXPANDED */
static int buf_append_eap_hdr(struct oc_text_buf *buf, uint8_t code, uint8_t ident, uint8_t type,
uint32_t subtype)
{
unsigned char b[24];
int len_ofs = -1;
if (!buf_error(buf))
len_ofs = buf->pos;
b[0] = code;
b[1] = ident;
b[2] = b[3] = 0; /* Length is filled in later. */
if (type == EAP_TYPE_EXPANDED) {
store_be32(b + 4, EXPANDED_JUNIPER);
store_be32(b + 8, subtype);
buf_append_bytes(buf, b, 12);
} else {
b[4] = type;
buf_append_bytes(buf, b, 5);
}
return len_ofs;
}
/* For an IF-T/TLS auth frame containing the Juniper/1 Auth Type,
* the EAP header is at offset 0x14. Fill in the length field,
* based on the current length of the buf */
static void buf_fill_eap_len(struct oc_text_buf *buf, int ofs)
{
/* EAP length word is always at 0x16, and counts bytes from 0x14 */
if (ofs >= 0 && !buf_error(buf) && buf->pos >= ofs + 4)
store_be16(buf->data + ofs + 2, buf->pos - ofs);
}
static void buf_append_avp(struct oc_text_buf *buf, uint32_t type, const void *bytes, int len)
{
buf_append_be32(buf, type);
buf_append_be16(buf, 0x8000);
buf_append_be16(buf, len + 12);
buf_append_be32(buf, VENDOR_JUNIPER2);
buf_append_bytes(buf, bytes, len);
if (len & 3) {
uint32_t pad = 0;
buf_append_bytes(buf, &pad, 4 - ( len & 3 ));
}
}
static void buf_append_avp_string(struct oc_text_buf *buf, uint32_t type, const char *str)
{
buf_append_avp(buf, type, str, strlen(str));
}
static void buf_append_avp_be32(struct oc_text_buf *buf, uint32_t type, uint32_t val)
{
uint32_t val_be;
store_be32(&val_be, val);
buf_append_avp(buf, type, &val_be, sizeof(val_be));
}
static int valid_ift_success(unsigned char *bytes, int len)
{
if (len != 0x18 || (load_be32(bytes) & 0xffffff) != VENDOR_TCG ||
load_be32(bytes + 4) != IFT_CLIENT_AUTH_SUCCESS ||
load_be32(bytes + 8) != len ||
load_be32(bytes + 0x10) != JUNIPER_1 ||
bytes[0x14] != EAP_SUCCESS ||
load_be16(bytes + 0x16) != len - 0x14)
return 0;
return 1;
}
/* Check for a valid IF-T/TLS auth challenge of the Juniper/1 Auth Type */
static int valid_ift_auth(unsigned char *bytes, int len)
{
if (len < 0x14 || (load_be32(bytes) & 0xffffff) != VENDOR_TCG ||
load_be32(bytes + 4) != IFT_CLIENT_AUTH_CHALLENGE ||
load_be32(bytes + 8) != len ||
load_be32(bytes + 0x10) != JUNIPER_1)
return 0;
return 1;
}
static int valid_ift_auth_eap(unsigned char *bytes, int len)
{
/* Needs to be a valid IF-T/TLS auth challenge with the
* expect Auth Type, *and* the payload has to be a valid
* EAP request with correct length field. */
if (!valid_ift_auth(bytes, len) || len < 0x19 ||
bytes[0x14] != EAP_REQUEST ||
load_be16(bytes + 0x16) != len - 0x14)
return 0;
return 1;
}
static int valid_ift_auth_eap_exj1(unsigned char *bytes, int len)
{
/* Also needs to be the Expanded Juniper/1 EAP Type */
if (!valid_ift_auth_eap(bytes, len) || len < 0x20 ||
load_be32(bytes + 0x18) != EXPANDED_JUNIPER ||
load_be32(bytes + 0x1c) != 1)
return 0;
return 1;
}
/* We behave like CSTP — create a linked list in vpninfo->cstp_options
* with the strings containing the information we got from the server,
* and oc_ip_info contains const copies of those pointers. */
static const char *add_option(struct openconnect_info *vpninfo, const char *opt,
const char *val, int val_len)
{
struct oc_vpn_option *new = malloc(sizeof(*new));
if (!new)
return NULL;
new->option = strdup(opt);
if (!new->option) {
free(new);
return NULL;
}
if (val_len >= 0)
new->value = strndup(val, val_len);
else
new->value = strdup(val);
if (!new->value) {
free(new->option);
free(new);
return NULL;
}
new->next = vpninfo->cstp_options;
vpninfo->cstp_options = new;
return new->value;
}
static int process_attr(struct openconnect_info *vpninfo, uint16_t type,
unsigned char *data, int attrlen)
{
struct oc_split_include *xc;
char buf[80];
int i;
switch (type) {
case 0x0001:
if (attrlen != 4)
goto badlen;
snprintf(buf, sizeof(buf), "%d.%d.%d.%d", data[0], data[1], data[2], data[3]);
vpn_progress(vpninfo, PRG_DEBUG, _("Received internal Legacy IP address %s\n"), buf);
vpninfo->ip_info.addr = add_option(vpninfo, "ipaddr", buf, -1);
break;
case 0x0002:
if (attrlen != 4)
goto badlen;
snprintf(buf, sizeof(buf), "%d.%d.%d.%d", data[0], data[1], data[2], data[3]);
vpn_progress(vpninfo, PRG_DEBUG, _("Received netmask %s\n"), buf);
vpninfo->ip_info.netmask = add_option(vpninfo, "netmask", buf, -1);
break;
case 0x0003:
if (attrlen != 4)
goto badlen;
snprintf(buf, sizeof(buf), "%d.%d.%d.%d", data[0], data[1], data[2], data[3]);
vpn_progress(vpninfo, PRG_DEBUG, _("Received DNS server %s\n"), buf);
for (i = 0; i < 3; i++) {
if (!vpninfo->ip_info.dns[i]) {
vpninfo->ip_info.dns[i] = add_option(vpninfo, "DNS", buf, -1);
break;
}
}
break;
case 0x0004:
if (attrlen != 4)
goto badlen;
snprintf(buf, sizeof(buf), "%d.%d.%d.%d", data[0], data[1], data[2], data[3]);
vpn_progress(vpninfo, PRG_DEBUG, _("Received WINS server %s\n"), buf);
for (i = 0; i < 3; i++) {
if (!vpninfo->ip_info.nbns[i]) {
vpninfo->ip_info.nbns[i] = add_option(vpninfo, "WINS", buf, -1);
break;
}
}
break;
case 0x0008:
if (attrlen != 17)
goto badlen;
if (!inet_ntop(AF_INET6, data, buf, sizeof(buf))) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to handle IPv6 address\n"));
return -EINVAL;
}
vpninfo->ip_info.addr6 = add_option(vpninfo, "ip6addr", buf, -1);
i = strlen(buf);
snprintf(buf + i, sizeof(buf) - i, "/%d", data[16]);
vpninfo->ip_info.netmask6 = add_option(vpninfo, "ip6netmask", buf, -1);
vpn_progress(vpninfo, PRG_DEBUG, _("Received internal IPv6 address %s\n"), buf);
break;
case 0x000a:
if (attrlen != 16)
goto badlen;
if (!inet_ntop(AF_INET6, data, buf, sizeof(buf))) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to handle IPv6 address\n"));
return -EINVAL;
}
for (i = 0; i < 3; i++) {
if (!vpninfo->ip_info.dns[i]) {
vpninfo->ip_info.dns[i] = add_option(vpninfo, "DNS", buf, -1);
break;
}
}
vpn_progress(vpninfo, PRG_DEBUG, _("Received DNS server %s\n"), buf);
break;
case 0x000f:
if (attrlen != 17)
goto badlen;
if (!inet_ntop(AF_INET6, data, buf, sizeof(buf))) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to handle IPv6 address\n"));
return -EINVAL;
}
i = strlen(buf);
snprintf(buf + i, sizeof(buf) - i, "/%d", data[16]);
xc = malloc(sizeof(*xc));
if (xc) {
xc->route = add_option(vpninfo, "split-include6", buf, -1);
if (xc->route) {
xc->next = vpninfo->ip_info.split_includes;
vpninfo->ip_info.split_includes = xc;
} else
free(xc);
}
vpn_progress(vpninfo, PRG_DEBUG, _("Received IPv6 split include %s\n"), buf);
break;
case 0x0010:
if (attrlen != 17)
goto badlen;
if (!inet_ntop(AF_INET6, data, buf, sizeof(buf))) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to handle IPv6 address\n"));
return -EINVAL;
}
i = strlen(buf);
snprintf(buf + i, sizeof(buf) - i, "/%d", data[16]);
xc = malloc(sizeof(*xc));
if (xc) {
xc->route = add_option(vpninfo, "split-exclude6", buf, -1);
if (xc->route) {
xc->next = vpninfo->ip_info.split_excludes;
vpninfo->ip_info.split_excludes = xc;
} else
free(xc);
}
vpn_progress(vpninfo, PRG_DEBUG, _("Received IPv6 split exclude %s\n"), buf);
break;
case 0x4005:
if (attrlen != 4) {
badlen:
vpn_progress(vpninfo, PRG_ERR,
_("Unexpected length %d for attr 0x%x\n"),
attrlen, type);
return -EINVAL;
}
vpninfo->ip_info.mtu = load_be32(data);
vpn_progress(vpninfo, PRG_DEBUG,
_("Received MTU %d from server\n"),
vpninfo->ip_info.mtu);
break;
case 0x4006:
if (!attrlen)
goto badlen;
if (!data[attrlen-1])
attrlen--;
vpn_progress(vpninfo, PRG_DEBUG, _("Received DNS search domain %.*s\n"),
attrlen, (char *)data);
vpninfo->ip_info.domain = add_option(vpninfo, "search", (char *)data, attrlen);
if (vpninfo->ip_info.domain) {
char *p = (char *)vpninfo->ip_info.domain;
while ((p = strchr(p, ',')))
*p = ' ';
}
break;
case 0x400b:
if (attrlen != 4)
goto badlen;
snprintf(buf, sizeof(buf), "%d.%d.%d.%d", data[0], data[1], data[2], data[3]);
vpn_progress(vpninfo, PRG_DEBUG, _("Received internal gateway address %s\n"), buf);
/* Hm, what are we supposed to do with this? It's a tunnel;
having a gateway is meaningless. */
add_option(vpninfo, "ipaddr", buf, -1);
break;
case 0x4010: {
const char *enctype;
uint16_t val;
if (attrlen != 2)
goto badlen;
val = load_be16(data);
if (val == ENC_AES_128_CBC) {
enctype = "AES-128";
vpninfo->enc_key_len = 16;
} else if (val == ENC_AES_256_CBC) {
enctype = "AES-256";
vpninfo->enc_key_len = 32;
} else
enctype = "unknown";
vpn_progress(vpninfo, PRG_DEBUG, _("ESP encryption: 0x%04x (%s)\n"),
val, enctype);
vpninfo->esp_enc = val;
break;
}
case 0x4011: {
const char *mactype;
uint16_t val;
if (attrlen != 2)
goto badlen;
val = load_be16(data);
if (val == HMAC_MD5) {
mactype = "MD5";
vpninfo->hmac_key_len = 16;
} else if (val == HMAC_SHA1) {
mactype = "SHA1";
vpninfo->hmac_key_len = 20;
} else if (val == HMAC_SHA256) {
mactype = "SHA256";
vpninfo->hmac_key_len = 32;
} else
mactype = "unknown";
vpn_progress(vpninfo, PRG_DEBUG, _("ESP HMAC: 0x%04x (%s)\n"),
val, mactype);
vpninfo->esp_hmac = val;
break;
}
case 0x4012:
if (attrlen != 4)
goto badlen;
vpninfo->esp_lifetime_seconds = load_be32(data);
vpn_progress(vpninfo, PRG_DEBUG, _("ESP key lifetime: %u seconds\n"),
vpninfo->esp_lifetime_seconds);
break;
case 0x4013:
if (attrlen != 4)
goto badlen;
vpninfo->esp_lifetime_bytes = load_be32(data);
vpn_progress(vpninfo, PRG_DEBUG, _("ESP key lifetime: %u bytes\n"),
vpninfo->esp_lifetime_bytes);
break;
case 0x4014:
if (attrlen != 4)
goto badlen;
vpninfo->esp_replay_protect = load_be32(data);
vpn_progress(vpninfo, PRG_DEBUG, _("ESP replay protection: %d\n"),
load_be32(data));
break;
case 0x4016:
if (attrlen != 2)
goto badlen;
i = load_be16(data);
udp_sockaddr(vpninfo, i);
vpn_progress(vpninfo, PRG_DEBUG, _("ESP port: %d\n"), i);
break;
case 0x4017:
if (attrlen != 4)
goto badlen;
vpninfo->esp_ssl_fallback = load_be32(data);
vpn_progress(vpninfo, PRG_DEBUG, _("ESP to SSL fallback: %u seconds\n"),
vpninfo->esp_ssl_fallback);
break;
case 0x401a:
if (attrlen != 1)
goto badlen;
/* Amusingly, this isn't enforced. It's client-only */
vpn_progress(vpninfo, PRG_DEBUG, _("ESP only: %d\n"),
data[0]);
break;
#if 0
case GRP_ATTR(7, 1):
if (attrlen != 4)
goto badlen;
memcpy(&vpninfo->esp_out.spi, data, 4);
vpn_progress(vpninfo, PRG_DEBUG, _("ESP SPI (outbound): %x\n"),
load_be32(data));
break;
case GRP_ATTR(7, 2):
if (attrlen != 0x40)
goto badlen;
/* data contains enc_key and hmac_key concatenated */
memcpy(vpninfo->esp_out.enc_key, data, 0x40);
vpn_progress(vpninfo, PRG_DEBUG, _("%d bytes of ESP secrets\n"),
attrlen);
break;
#endif
/* 0x4022: disable proxy
0x400a: preserve proxy
0x4008: proxy (string)
0x4000: disconnect when routes changed
0x4015: tos copy
0x4001: tunnel routes take precedence
0x401f: tunnel routes with subnet access (also 4001 set)
0x4020: Enforce IPv4
0x4021: Enforce IPv6
0x401e: Server IPv6 address
0x000f: IPv6 netmask?
*/
default:
buf[0] = 0;
for (i=0; i < 16 && i < attrlen; i++)
sprintf(buf + strlen(buf), " %02x", data[i]);
if (attrlen > 16)
sprintf(buf + strlen(buf), "...");
vpn_progress(vpninfo, PRG_DEBUG,
_("Unknown attr 0x%x len %d:%s\n"),
type, attrlen, buf);
}
return 0;
}
static int recv_ift_packet(struct openconnect_info *vpninfo, void *buf, int len)
{
int ret = vpninfo->ssl_read(vpninfo, buf, len);
if (ret > 0 && vpninfo->dump_http_traffic) {
vpn_progress(vpninfo, PRG_TRACE,
_("Read %d bytes of IF-T/TLS record\n"), ret);
dump_buf_hex(vpninfo, PRG_TRACE, '<', buf, ret);
}
return ret;
}
static int send_ift_bytes(struct openconnect_info *vpninfo, void *bytes, int len)
{
int ret;
store_be32(((char *)bytes) + 12, vpninfo->ift_seq++);
dump_buf_hex(vpninfo, PRG_DEBUG, '>', (void *)bytes, len);
ret = vpninfo->ssl_write(vpninfo, bytes, len);
if (ret != len) {
if (ret >= 0) {
vpn_progress(vpninfo, PRG_ERR,
_("Short write to IF-T/TLS\n"));
ret = -EIO;
}
return ret;
}
return 0;
}
static int send_ift_packet(struct openconnect_info *vpninfo, struct oc_text_buf *buf)
{
if (buf_error(buf) || buf->pos < 16) {
vpn_progress(vpninfo, PRG_ERR,
_("Error creating IF-T packet\n"));
return buf_error(buf);
}
/* Fill in the length word in the header with the full length of the buffer.
* Also populate the sequence number. */
store_be32(buf->data + 8, buf->pos);
return send_ift_bytes(vpninfo, buf->data, buf->pos);
}
/* We create packets with IF-T/TLS headers prepended because that's the
* larger header. In the case where they need to be sent over EAP-TTLS,
* convert the header to the EAP-Message AVP instead. */
static int send_eap_packet(struct openconnect_info *vpninfo, void *ttls, struct oc_text_buf *buf)
{
int ret;
if (buf_error(buf) || buf->pos < 16) {
vpn_progress(vpninfo, PRG_ERR,
_("Error creating EAP packet\n"));
return buf_error(buf);
}
if (!ttls)
return send_ift_packet(vpninfo, buf);
/* AVP EAP-Message header */
store_be32(buf->data + 0x0c, AVP_CODE_EAP_MESSAGE);
store_be32(buf->data + 0x10, buf->pos - 0xc);
dump_buf_hex(vpninfo, PRG_DEBUG, '.', (void *)(buf->data + 0x0c), buf->pos - 0x0c);
ret = TTLS_SEND(ttls, buf->data + 0x0c, buf->pos - 0x0c);
if (ret != buf->pos - 0x0c)
return -EIO;
return 0;
}
/*
* Using the given buffer, receive and validate an EAP request of the
* Expanded Juniper/1 type, either natively over IF-T/TLS or by EAP-TTLS
* over IF-T/TLS. Return a pointer to the EAP header, with its length and
* type already validated.
*/
static void *recv_eap_packet(struct openconnect_info *vpninfo, void *ttls, void *buf, int len)
{
unsigned char *cbuf = buf;
int ret;
if (!ttls) {
ret = recv_ift_packet(vpninfo, buf, len);
if (ret < 0)
return NULL;
if (!valid_ift_auth_eap_exj1(buf, ret)) {
vpn_progress(vpninfo, PRG_ERR,
_("Unexpected IF-T/TLS authentication challenge:\n"));
dump_buf_hex(vpninfo, PRG_ERR, '<', (void *)buf, ret);
return NULL;
}
return cbuf + 0x14;
} else {
ret = TTLS_RECV(ttls, buf, len);
if (ret <= 8)
return NULL;
if (/* EAP-Message AVP */
load_be32(cbuf) != AVP_CODE_EAP_MESSAGE ||
/* Ignore the mandatory bit */
(load_be32(cbuf+0x04) & ~0x40000000) != ret ||
cbuf[0x08] != EAP_REQUEST ||
load_be16(cbuf+0x0a) != ret - 8 ||
load_be32(cbuf+0x0c) != EXPANDED_JUNIPER ||
load_be32(cbuf+0x10) != 1) {
vpn_progress(vpninfo, PRG_ERR,
_("Unexpected EAP-TTLS payload:\n"));
dump_buf_hex(vpninfo, PRG_ERR, '<', buf, ret);
return NULL;
}
return cbuf + 0x08;
}
}
static void dump_avp(struct openconnect_info *vpninfo, uint8_t flags,
uint32_t vendor, uint32_t code, void *p, int len)
{
struct oc_text_buf *buf = buf_alloc();
const char *pretty;
int i;
for (i = 0; i < len; i++)
if (!isprint( ((char *)p)[i] ))
break;
if (i == len) {
buf_append(buf, " '");
buf_append_bytes(buf, p, len);
buf_append(buf, "'");
} else {
for (i = 0; i < len; i++)
buf_append(buf, " %02x", ((unsigned char *)p)[i]);
}
if (buf_error(buf))
pretty = " <error>";
else
pretty = buf->data;
if (flags & AVP_VENDOR)
vpn_progress(vpninfo, PRG_TRACE, _("AVP 0x%x/0x%x:%s\n"), vendor, code, pretty);
else
vpn_progress(vpninfo, PRG_TRACE, _("AVP %d:%s\n"), code, pretty);
buf_free(buf);
}
/* RFC5281 §10 */
static int parse_avp(struct openconnect_info *vpninfo, void **pkt, int *pkt_len,
void **avp_out, int *avp_len, uint8_t *avp_flags,
uint32_t *avp_vendor, uint32_t *avp_code)
{
unsigned char *p = *pkt;
int l = *pkt_len;
uint32_t code, len, vendor = 0;
uint8_t flags;
if (l < 8)
return -EINVAL;
code = load_be32(p);
len = load_be32(p + 4) & 0xffffff;
flags = p[4];
if (len > l || len < 8)
return -EINVAL;
p += 8;
l -= 8;
len -= 8;
/* Vendor field is optional. */
if (flags & AVP_VENDOR) {
if (l < 4)
return -EINVAL;
vendor = load_be32(p);
p += 4;
l -= 4;
len -= 4;
}
*avp_vendor = vendor;
*avp_flags = flags;
*avp_code = code;
*avp_out = p;
*avp_len = len;
/* Now set up packet pointer and length for next AVP,
* aligned to 4 octets (if they exist in the packet) */
len = (len + 3) & ~3;
if (len > l)
len = l;
*pkt = p + len;
*pkt_len = l - len;
return 0;
}
static int pulse_request_realm_entry(struct openconnect_info *vpninfo, struct oc_text_buf *reqbuf)
{
struct oc_auth_form f;
struct oc_form_opt o;
int ret;
memset(&f, 0, sizeof(f));
memset(&o, 0, sizeof(o));
f.auth_id = (char *)"pulse_realm_entry";
f.opts = &o;
f.message = _("Enter Pulse user realm:");
o.next = NULL;
o.type = OC_FORM_OPT_TEXT;
o.name = (char *)"realm";
o.label = (char *)_("Realm:");
ret = process_auth_form(vpninfo, &f);
if (ret)
return ret;
if (o._value) {
buf_append_avp_string(reqbuf, 0xd50, o._value);
free_pass(&o._value);
return 0;
}
return -EINVAL;
}
static int pulse_request_realm_choice(struct openconnect_info *vpninfo, struct oc_text_buf *reqbuf,
int realms, unsigned char *eap)
{
uint8_t avp_flags;
uint32_t avp_code;
uint32_t avp_vendor;
int avp_len;
void *avp_p;
struct oc_auth_form f;
struct oc_form_opt_select o;
int i = 0, ret;
void *p;
int l;
l = load_be16(eap + 2) - 0x0c; /* Already validated */
p = eap + 0x0c;
memset(&f, 0, sizeof(f));
memset(&o, 0, sizeof(o));
f.auth_id = (char *)"pulse_realm_choice";
f.opts = &o.form;
f.authgroup_opt = &o;
f.authgroup_selection = 1;
f.message = _("Choose Pulse user realm:");
o.form.next = NULL;
o.form.type = OC_FORM_OPT_SELECT;
o.form.name = (char *)"realm_choice";
o.form.label = (char *)_("Realm:");
o.nr_choices = realms;
o.choices = calloc(realms, sizeof(*o.choices));
if (!o.choices)
return -ENOMEM;
while (l) {
if (parse_avp(vpninfo, &p, &l, &avp_p, &avp_len, &avp_flags,
&avp_vendor, &avp_code)) {
vpn_progress(vpninfo, PRG_ERR,
_("Failed to parse AVP\n"));
ret = -EINVAL;
goto out;
}
if (avp_vendor != VENDOR_JUNIPER2 || avp_code != 0xd4e)
continue;
o.choices[i] = malloc(sizeof(struct oc_choice));
if (!o.choices[i]) {
ret = -ENOMEM;
goto out;
}
o.choices[i]->name = o.choices[i]->label = strndup(avp_p, avp_len);
if (!o.choices[i]->name) {
ret = -ENOMEM;
goto out;
}
i++;
}
/* We don't need to do anything on group changes. */
do {
ret = process_auth_form(vpninfo, &f);
} while (ret == OC_FORM_RESULT_NEWGROUP);
if (!ret)
buf_append_avp_string(reqbuf, 0xd50, o.form._value);
out:
if (o.choices) {
for (i = 0; i < realms; i++) {
if (o.choices[i]) {
free(o.choices[i]->name);
free(o.choices[i]);
}
}
free(o.choices);
}
return ret;
}
static int pulse_request_session_kill(struct openconnect_info *vpninfo, struct oc_text_buf *reqbuf,
int sessions, unsigned char *eap)
{
uint8_t avp_flags;
uint32_t avp_code;
uint32_t avp_vendor;
int avp_len, avp_len2;
void *avp_p, *avp_p2;
struct oc_auth_form f;
struct oc_form_opt_select o;
int i = 0, ret;
void *p;
int l;
struct oc_text_buf *form_msg = buf_alloc();
char tmbuf[80];
struct tm tm;
l = load_be16(eap + 2) - 0x0c; /* Already validated */
p = eap + 0x0c;
memset(&f, 0, sizeof(f));
memset(&o, 0, sizeof(o));
f.auth_id = (char *)"pulse_session_kill";
f.opts = &o.form;
buf_append(form_msg, _("Session limit reached. Choose session to kill:\n"));
o.form.next = NULL;
o.form.type = OC_FORM_OPT_SELECT;
o.form.name = (char *)"session_choice";
o.form.label = (char *)_("Session:");
o.nr_choices = sessions;
o.choices = calloc(sessions, sizeof(*o.choices));
if (!o.choices) {
ret = -ENOMEM;
goto out;
}
while (l) {
char *from = NULL;
time_t when = 0;
char *sessid = NULL;
if (parse_avp(vpninfo, &p, &l, &avp_p, &avp_len, &avp_flags,
&avp_vendor, &avp_code)) {
badlist:
free(from);
free(sessid);
vpn_progress(vpninfo, PRG_ERR,
_("Failed to parse session list\n"));
ret = -EINVAL;
goto out;
}
if (avp_vendor != VENDOR_JUNIPER2 || avp_code != 0xd65)
continue;
while (avp_len) {
if (parse_avp(vpninfo, &avp_p, &avp_len, &avp_p2, &avp_len2,
&avp_flags, &avp_vendor, &avp_code))
goto badlist;
dump_avp(vpninfo, avp_flags, avp_vendor, avp_code, avp_p2, avp_len2);
if (avp_vendor == VENDOR_JUNIPER2 && avp_code == 0xd66) {
free(sessid);
sessid = strndup(avp_p2, avp_len2);
} else if (avp_vendor == VENDOR_JUNIPER2 && avp_code == 0xd67) {
free(from);
from = strndup(avp_p2, avp_len2);
} else if (avp_vendor == VENDOR_JUNIPER2 && avp_code == 0xd68 &&
avp_len2 == 8) {
when = load_be32((char *)avp_p2 + 4);
if (sizeof(time_t) > 4)
when |= ((uint64_t)load_be32(avp_p2)) << 32;
}
}
if (!from || !sessid || !when)
goto badlist;
if (0
#ifdef HAVE_LOCALTIME_S
|| !localtime_s(&tm, &when)
#endif
#ifdef HAVE_LOCALTIME_R
|| localtime_r(&when, &tm)
#endif
) {
strftime(tmbuf, sizeof(tmbuf), "%a, %d %b %Y %H:%M:%S %Z", &tm);
} else
snprintf(tmbuf, sizeof(tmbuf), "@%lu", (unsigned long)when);
buf_append(form_msg, " - %s from %s at %s\n", sessid, from, tmbuf);
free(from);
from = NULL;
o.choices[i] = malloc(sizeof(struct oc_choice));
if (!o.choices[i]) {
free(sessid);
ret = -ENOMEM;
goto out;
}