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ie: Parse GTK and IGTK subelements in FTE

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Parse the contents of the GTK and IGTK subelements in an FT IE instead
of working with buffers containing the whole subelement.  Some more
validation of the subelement contents.  Drop support for GTK / IGTK when
building the FTE (unused).
This commit is contained in:
Andrew Zaborowski 2017-02-01 11:58:40 +01:00 committed by Denis Kenzior
parent e4c5b4b517
commit 9ceca7a521
2 changed files with 29 additions and 21 deletions
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42
src/ie.c
View File

@ -1460,8 +1460,18 @@ int ie_parse_fast_bss_transition(struct ie_tlv_iter *iter,
if (subelem_len < 35 || subelem_len > 51)
return -EINVAL;
memcpy(info->gtk, data, subelem_len);
info->gtk_len = subelem_len;
info->gtk_key_id = util_bit_field(data[0], 0, 2);
info->gtk_len = data[2];
/*
* Check Wrapped Key field length is Key Length plus
* padding (0 - 7 bytes) plus 8 bytes for AES key wrap.
*/
if (align_len(info->gtk_len, 8) + 8 != subelem_len - 11)
return -EINVAL;
memcpy(info->gtk_rsc, data + 3, 8);
memcpy(info->gtk, data + 11, subelem_len - 11);
break;
case 3:
@ -1475,11 +1485,17 @@ int ie_parse_fast_bss_transition(struct ie_tlv_iter *iter,
break;
case 4:
if (subelem_len < 1)
if (subelem_len != 33)
return -EINVAL;
memcpy(info->igtk, data, subelem_len);
info->igtk_len = subelem_len;
info->igtk_key_id = l_get_le16(data);
memcpy(info->igtk_ipn, data + 2, 6);
info->igtk_len = data[8];
if (info->igtk_len > 16)
return -EINVAL;
memcpy(info->igtk, data + 9, subelem_len - 9);
break;
}
@ -1538,13 +1554,7 @@ bool ie_build_fast_bss_transition(const struct ie_ft_info *info, uint8_t *to)
*len += 8;
}
if (info->gtk_len) {
to[0] = 2;
to[1] = info->gtk_len;
memcpy(to + 2, info->gtk, info->gtk_len);
to += 2 + info->gtk_len;
*len += 2 + info->gtk_len;
}
L_WARN_ON(info->gtk_len); /* Not implemented */
if (info->r0khid_len) {
to[0] = 3;
@ -1554,13 +1564,7 @@ bool ie_build_fast_bss_transition(const struct ie_ft_info *info, uint8_t *to)
*len += 2 + info->r0khid_len;
}
if (info->igtk_len) {
to[0] = 4;
to[1] = info->igtk_len;
memcpy(to + 2, info->igtk, info->igtk_len);
to += 2 + info->igtk_len;
*len += 2 + info->igtk_len;
}
L_WARN_ON(info->igtk_len); /* Not implemented */
return true;
}

8
src/ie.h
View File

@ -238,10 +238,14 @@ struct ie_ft_info {
size_t r0khid_len;
uint8_t r1khid[6];
bool r1khid_present:1;
uint8_t gtk[51];
uint8_t gtk_key_id;
uint8_t gtk_len;
uint8_t igtk[255];
uint8_t gtk_rsc[8];
uint8_t gtk[40];
uint16_t igtk_key_id;
uint8_t igtk_ipn[6];
uint8_t igtk_len;
uint8_t igtk[24];
};
/* See chapter 8.4.2.47 for radio measurement capability details */