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ft: expose ft_build_authenticate_ies

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The building of the FT IEs for Action/Authenticate
frames will need to be shared between ft and netdev
once FT-over-DS is refactored.

The building was refactored to work off the callers
buffer rather than internal stack buffers. An argument
'new_snonce' was included as FT-over-DS will generate
a new snonce for the initial action frame, hence the
handshakes snonce cannot be used.
This commit is contained in:
James Prestwood 2021-04-27 12:49:41 -07:00 committed by Denis Kenzior
parent f3e4266add
commit f4d515fc79
2 changed files with 38 additions and 28 deletions
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62
src/ft.c
View File

@ -727,19 +727,16 @@ static void ft_sm_free(struct auth_proto *ap)
l_free(ft);
}
static bool ft_start(struct auth_proto *ap)
bool ft_build_authenticate_ies(struct handshake_state *hs,
const uint8_t *new_snonce, uint8_t *buf,
size_t *len)
{
struct ft_sm *ft = l_container_of(ap, struct ft_sm, ap);
struct handshake_state *hs = ft->hs;
uint32_t kck_len = handshake_state_get_kck_len(hs);
bool is_rsn = hs->supplicant_ie != NULL;
uint8_t mde[5];
struct iovec iov[3];
size_t iov_elems = 0;
uint8_t *ptr = buf;
if (is_rsn) {
struct ie_rsn_info rsn_info;
uint8_t *rsne;
/*
* Rebuild the RSNE to include the PMKR0Name and append
@ -760,26 +757,18 @@ static bool ft_start(struct auth_proto *ap)
rsn_info.num_pmkids = 1;
rsn_info.pmkids = hs->pmk_r0_name;
rsne = alloca(256);
ie_build_rsne(&rsn_info, rsne);
iov[iov_elems].iov_base = rsne;
iov[iov_elems].iov_len = rsne[1] + 2;
iov_elems += 1;
ie_build_rsne(&rsn_info, ptr);
ptr += ptr[1] + 2;
}
/* The MDE advertised by the BSS must be passed verbatim */
mde[0] = IE_TYPE_MOBILITY_DOMAIN;
mde[1] = 3;
memcpy(mde + 2, hs->mde + 2, 3);
iov[iov_elems].iov_base = mde;
iov[iov_elems].iov_len = 5;
iov_elems += 1;
ptr[0] = IE_TYPE_MOBILITY_DOMAIN;
ptr[1] = 3;
memcpy(ptr + 2, hs->mde + 2, 3);
ptr += 5;
if (is_rsn) {
struct ie_ft_info ft_info;
uint8_t *fte;
/*
* 12.8.2: "If present, the FTE shall be set as follows:
@ -796,17 +785,34 @@ static bool ft_start(struct auth_proto *ap)
memcpy(ft_info.r0khid, hs->r0khid, hs->r0khid_len);
ft_info.r0khid_len = hs->r0khid_len;
memcpy(ft_info.snonce, hs->snonce, 32);
memcpy(ft_info.snonce, new_snonce, 32);
fte = alloca(256);
ie_build_fast_bss_transition(&ft_info, kck_len, fte);
ie_build_fast_bss_transition(&ft_info, kck_len, ptr);
iov[iov_elems].iov_base = fte;
iov[iov_elems].iov_len = fte[1] + 2;
iov_elems += 1;
ptr += ptr[1] + 2;
}
ft->tx_auth(iov, iov_elems, ft->user_data);
if (len)
*len = ptr - buf;
return true;
}
static bool ft_start(struct auth_proto *ap)
{
struct ft_sm *ft = l_container_of(ap, struct ft_sm, ap);
struct handshake_state *hs = ft->hs;
struct iovec iov;
uint8_t buf[512];
size_t len;
if (!ft_build_authenticate_ies(hs, hs->snonce, buf, &len))
return false;
iov.iov_base = buf;
iov.iov_len = len;
ft->tx_auth(&iov, 1, ft->user_data);
return true;
}

4
src/ft.h
View File

@ -25,6 +25,10 @@ typedef void (*ft_tx_authenticate_func_t)(struct iovec *iov, size_t iov_len,
typedef void (*ft_tx_associate_func_t)(struct iovec *ie_iov, size_t iov_len,
void *user_data);
bool ft_build_authenticate_ies(struct handshake_state *hs,
const uint8_t *new_snonce, uint8_t *buf,
size_t *len);
struct auth_proto *ft_over_air_sm_new(struct handshake_state *hs,
ft_tx_authenticate_func_t tx_auth,
ft_tx_associate_func_t tx_assoc,