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SIM/USIM: Add function to get the MNC length from the SIM/USIM

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The EF-AD (administrative data) file may contain information about the
length of the MNC (2 or 3 digits) in the IMSI. This can be used to
construct the realm according to 3GPP TS 23.003 during EAP-SIM or
EAP-AKA authentication.

Signed-hostap: Simon Baatz <gmbnomis@gmail.com>
This commit is contained in:
Simon Baatz 2012-01-22 19:28:24 +02:00 committed by Jouni Malinen
parent 8aebb0e471
commit 8ab7a37089
2 changed files with 57 additions and 0 deletions
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55
src/utils/pcsc_funcs.c
View file

@ -1023,6 +1023,61 @@ int scard_get_imsi(struct scard_data *scard, char *imsi, size_t *len)
}
/**
* scard_get_mnc_len - Read length of MNC in the IMSI from SIM/USIM card
* @scard: Pointer to private data from scard_init()
* Returns: length (>0) on success, -1 if administrative data file cannot be
* selected, -2 if administrative data file selection returns invalid result
* code, -3 if parsing FSP template file fails (USIM only), -4 if length of
* the file is unexpected, -5 if reading file fails, -6 if MNC length is not
* in range (i.e. 2 or 3), -7 if MNC length is not available.
*
*/
int scard_get_mnc_len(struct scard_data *scard)
{
unsigned char buf[100];
size_t blen;
int file_size;
wpa_printf(MSG_DEBUG, "SCARD: reading MNC len from (GSM) EF-AD");
blen = sizeof(buf);
if (scard_select_file(scard, SCARD_FILE_GSM_EF_AD, buf, &blen))
return -1;
if (blen < 4) {
wpa_printf(MSG_WARNING, "SCARD: too short (GSM) EF-AD "
"header (len=%ld)", (long) blen);
return -2;
}
if (scard->sim_type == SCARD_GSM_SIM) {
file_size = (buf[2] << 8) | buf[3];
} else {
if (scard_parse_fsp_templ(buf, blen, NULL, &file_size))
return -3;
}
if (file_size == 3) {
wpa_printf(MSG_DEBUG, "SCARD: MNC length not available");
return -7;
}
if (file_size < 4 || file_size > sizeof(buf)) {
wpa_printf(MSG_DEBUG, "SCARD: invalid file length=%ld",
(long) file_size);
return -4;
}
if (scard_read_file(scard, buf, file_size))
return -5;
buf[3] = buf[3] & 0x0f; /* upper nibble reserved for future use */
if (buf[3] < 2 || buf[3] > 3) {
wpa_printf(MSG_DEBUG, "SCARD: invalid MNC length=%ld",
(long) buf[3]);
return -6;
}
wpa_printf(MSG_DEBUG, "SCARD: MNC length=%ld", (long) buf[3]);
return buf[3];
}
/**
* scard_gsm_auth - Run GSM authentication command on SIM card
* @scard: Pointer to private data from scard_init()

2
src/utils/pcsc_funcs.h
View file

@ -26,6 +26,7 @@
#define SCARD_FILE_GSM_DF 0x7F20
#define SCARD_FILE_UMTS_DF 0x7F50
#define SCARD_FILE_GSM_EF_IMSI 0x6F07
#define SCARD_FILE_GSM_EF_AD 0x6FAD
#define SCARD_FILE_EF_DIR 0x2F00
#define SCARD_FILE_EF_ICCID 0x2FE2
#define SCARD_FILE_EF_CK 0x6FE1
@ -47,6 +48,7 @@ void scard_deinit(struct scard_data *scard);
int scard_set_pin(struct scard_data *scard, const char *pin);
int scard_get_imsi(struct scard_data *scard, char *imsi, size_t *len);
int scard_get_mnc_len(struct scard_data *scard);
int scard_gsm_auth(struct scard_data *scard, const unsigned char *_rand,
unsigned char *sres, unsigned char *kc);
int scard_umts_auth(struct scard_data *scard, const unsigned char *_rand,