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reworked message layout, minor protocol fixes

master
Michael Preisach 4 years ago
parent
60d1c56c54
commit
edc8390e84
5 changed files with 103 additions and 175 deletions
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  1. 12
      common.h
  2. 2
      issuer.c
  3. 93
      member.c
  4. 152
      verifier.c
  5. 1
      verifier.h

12
common.h
View File

@ -7,18 +7,20 @@
#include <string.h>
#include <stdint.h>
#define ISSUERIP "192.168.10.11"
#define ISSUERPORT 6590
#define MEMBERIP "192.168.10.12"
#define MEMBERPORT 6591
#define VERIFIERIP "192.168.10.10"
#define VERIFIERPORT 6592
#define MAX_CLIENTS 10
#define MAX_BUFSIZE 40960
#define MAX_MSGSIZE ((MAX_BUFSIZE - 1536) / 2)
#define MAX_MSGSIZE 15360
#define MAX_CHKSUMSIZE 1024
#define MAX_BUFSIZE (((MAX_MSGSIZE + 2) / 3) * 4) + (((MAX_CHKSUMSIZE + 2) / 3) * 4) + 1536
/* #define MAX_MSGSIZE ((MAX_BUFSIZE - 1536) / 2) - MAX_CHKSUMSIZE //for bin to hex*/
/* #define MAX_MSGSIZE ((MAX_BUFSIZE - 1536) / 4 * 3) - MAX_CHKSUMSIZE //for base64 */
#define MAX_BSNSIZE 128
#define NONCE_SIZE 384
#define MSGFILE "msg.txt"
#define CHKSUMFILE "chksum.txt"
typedef int (*conn_handler)(char *buffer);

2
issuer.c
View File

@ -238,7 +238,7 @@ int issuer_reset(char *buffer) {
return -1;
}
bzero(buffer, MAX_BUFSIZE);
strncpy(buffer, "RESETDONE\n", 10);
strncpy(buffer, "OK\n", 3);
return 0;
}

93
member.c
View File

@ -24,6 +24,9 @@ typedef struct member {
member_t member;
uint8_t msg[MAX_MSGSIZE];
size_t msg_len;
uint8_t chksum[MAX_CHKSUMSIZE];
size_t chksum_len;
int member_join(char *buffer);
int member_verifymsg(char *buffer);
@ -36,7 +39,7 @@ int member_joinfinish(char *buffer);
int main(int argc, char **argv) {
char buffer[MAX_BUFSIZE];
char *remote_ip = argv[2];
char *remote_ip;
int ret = 0;
//strncpy(member.bsn, "mybasename", 10);
//member.bsn_len = strlen(member.bsn);
@ -44,6 +47,7 @@ int main(int argc, char **argv) {
case 3:
if( 0 == strncasecmp("--join", argv[1], 6) || 0 == strncasecmp("-j", argv[1], 2)) {
member.state = ON;
remote_ip = argv[2];
ret = client_connect(&member_join, remote_ip, ISSUERPORT);
if (0 >= ret || JOINED != member.state) {
printf("Join process failed!\n");
@ -51,15 +55,16 @@ int main(int argc, char **argv) {
} else {
printf("Join process was successful\n");
}
} else {
printf("2 arguments but not join\n");
}
break;
case 4:
if( 0 == strncasecmp("--send", argv[1], 6) || 0 == strncasecmp("-s", argv[1], 2)) {
msg_len = ecdaa_read_from_file(msg, MAX_MSGSIZE, argv[3]);
else if( 0 == strncasecmp("--send", argv[1], 6) || 0 == strncasecmp("-s", argv[1], 2)) {
msg_len = ecdaa_read_from_file(msg, MAX_MSGSIZE, MSGFILE);
if (msg_len < 0) {
printf("Could not open message file %s\n", argv[3]);
printf("Could not open message file %s\n", MSGFILE);
return 1;
}
chksum_len = ecdaa_read_from_file(chksum, MAX_CHKSUMSIZE, CHKSUMFILE);
if (chksum_len < 0) {
printf("Could not open checksum file %s\n", CHKSUMFILE);
return 1;
}
if (0 > ecdaa_read_from_file(member.nonce, NONCE_SIZE, member_nonce_file) ||
@ -71,18 +76,20 @@ int main(int argc, char **argv) {
return 1;
}
member.state = JOINED;
remote_ip = argv[2];
ret = client_connect(&member_verifymsg, remote_ip, VERIFIERPORT);
if (0 >= ret || JOINED != member.state) {
printf("connection to verifier failed\n");
}
} else {
printf("3 arguments but not send\n");
printf("arguments invalid\n");
}
break;
default:
printf("Usage: \n Join an issuer's group: %s --join <issuer's IPv4>\n", argv[0]);
printf("Send a signed message to the verifier: %s --send <verifier's IPv4> <msgfile>\n", argv[0]);
printf("Send a signed message to the verifier: %s --send <verifier's IPv4>\n", argv[0]);
printf("Before sending a DAA-signed message, the member must join a DAA group\n");
printf("%s must not exceed %d Bytes, %s must be smaller than %d Bytes\n", MSGFILE, MAX_MSGSIZE, CHKSUMFILE, MAX_CHKSUMSIZE);
break;
}
return 0;
@ -125,7 +132,7 @@ int member_join(char *buffer) {
case APPEND:
if (0 == strncasecmp("JOINSTART", buffer, 9)) {
printf("ISSUER > MEMBER: %s\n", buffer);
member_joinappend(buffer);
member_joinappend(&buffer[10]);
member.state = JOINPROCEED;
} else {
printf("member_join: did not get nonce from issuer\n");
@ -136,7 +143,7 @@ int member_join(char *buffer) {
case JOINPROCEED:
if (0 == strncasecmp("JOINPROCEED", buffer, 11)) {
printf("ISSUER > MEMBER: %s\n", buffer);
member_joinfinish(buffer);
member_joinfinish(&buffer[12]);
member.state = JOINED;
ret = 1;
} else {
@ -154,28 +161,24 @@ int member_join(char *buffer) {
return ret;
}
//"VERIFYMSG" > "VERIFYMSG <attestval>"
//"VERIFYMSG <msg><checksum>0<signature>" or
//"VERIFYMSG <msg><checksum>1<signature with bsn>"
int member_verifymsg(char *buffer) {
char *current = buffer;
uint8_t binbuf[MAX_BUFSIZE];
uint8_t has_nym = member.bsn_len > 0 ? 1 : 0;
struct ecdaa_signature_FP256BN sig;
size_t sig_len = has_nym ? ecdaa_signature_FP256BN_with_nym_length() : ecdaa_signature_FP256BN_length();
int ret = 0;
if (0 == strncasecmp("OK", buffer, 2)) {
return 1;
} else if (0 == strncasecmp("ERR", buffer, 3)) {
printf("member_verifymsg: Verifier refused signature\n");
return 1;
}
int bytes = 0;
bzero(buffer, MAX_BUFSIZE);
strncpy(current, "VERIFYMSG ", 10);
current = &current[10];
ret = ecdaa_encode(msg, current, msg_len);
current = &current[2 * MAX_MSGSIZE];
bytes = ecdaa_encode(msg, current, MAX_MSGSIZE);
current = &current[bytes];
bytes = ecdaa_encode(chksum, current, MAX_CHKSUMSIZE);
current = &current[bytes];
if(has_nym) {
if (0 != ecdaa_signature_FP256BN_sign(&sig, msg, msg_len, member.bsn, member.bsn_len, &member.msk, &member.cred, ecdaa_rand)) {
printf("member_verifymsg: Signing message failed\n");
@ -194,40 +197,22 @@ int member_verifymsg(char *buffer) {
bzero(binbuf, MAX_BUFSIZE);
ecdaa_signature_FP256BN_serialize(binbuf, &sig, has_nym);
ret = ecdaa_encode(binbuf, current, sig_len);
bytes = ecdaa_encode(binbuf, current, sig_len);
printf("member_verifymsg: has_nym: %u, sig_len: %lu\n",has_nym, sig_len);
printf("member_verifymsg: msg: %s, len: %lu\n",msg, msg_len);
printf("member_verifymsg: bsn: %s, len: %lu\n",(char *)member.bsn, strlen((char *)member.bsn));
printf("member_verifymsg: msg: %s, len: %lu\n", msg, msg_len);
printf("member_verifymsg: chksum: %s, len: %lu\n", chksum, chksum_len);
printf("member_verifymsg: bsn: %s, len: %lu\n", (char *)member.bsn, strlen((char *)member.bsn));
printf("member_verifymsg: sig: %s, len: %lu\n", current, sig_len);
current[ret] = '\n';
return 0;
current[bytes] = '\n';
return 1;
}
//"PUBLISH" > "PUBLISH <member.mpk>"
/* int member_publish(char *buffer) { */
/* char *current; */
/* int ret = 0; */
/* uint8_t binbuf[MAX_BUFSIZE]; */
/* bzero(buffer, MAX_BUFSIZE); */
/* strncpy(buffer, "PUBLISH ", 8); */
/* current = &buffer[8]; */
/* bzero(binbuf, MAX_BUFSIZE); */
/* ecdaa_member_public_key_FP256BN_serialize(binbuf, &member.mpk); */
/* ret = ecdaa_encode(binbuf, current, ECDAA_MEMBER_PUBLIC_KEY_FP256BN_LENGTH); */
/* current[ret] = '\n'; */
/* return 0; */
/* } */
//"JOINSTART <issuer.nonce>" > "APPEND <member.mpk>"
int member_joinappend(char *buffer) {
char *current = &buffer[10];
char *current = buffer;
uint8_t binbuf[MAX_BUFSIZE];
int ret = ecdaa_decode(current, member.nonce, NONCE_SIZE);
int bytes = ecdaa_decode(current, member.nonce, NONCE_SIZE);
ecdaa_write_buffer_to_file(member_nonce_file, member.nonce, NONCE_SIZE);
// if (0 != ecdaa_member_key_pair_TPM_FP256BN_generate(&member.mpk, member.nonce, NONCE_SIZE)) {
if (0 != ecdaa_member_key_pair_FP256BN_generate(&member.mpk, &member.msk, member.nonce, NONCE_SIZE, ecdaa_rand)) {
@ -240,14 +225,14 @@ int member_joinappend(char *buffer) {
current = &buffer[7];
bzero(binbuf, MAX_BUFSIZE);
ecdaa_member_public_key_FP256BN_serialize(binbuf, &member.mpk);
ret = ecdaa_encode(binbuf, current, ECDAA_MEMBER_PUBLIC_KEY_FP256BN_LENGTH);
current[ret] = '\n';
bytes = ecdaa_encode(binbuf, current, ECDAA_MEMBER_PUBLIC_KEY_FP256BN_LENGTH);
current[bytes] = '\n';
return 0;
}
//"JOINPROCEED <member.cred><member.cred_sig>" > ""
int member_joinfinish(char *buffer) {
char *current = &buffer[12];
char *current = buffer;
uint8_t *bincur;
uint8_t binbuf[MAX_BUFSIZE];
int ret = 0;
@ -273,11 +258,7 @@ int member_joinfinish(char *buffer) {
0 != ecdaa_member_secret_key_FP256BN_serialize_file(member_secret_key_file, &member.msk) ||
0 != ecdaa_credential_FP256BN_serialize_file(member_credential_file, &member.cred)) {
printf("issuer_setup: Error saving key-pair or credential to disk\n");
strncpy(buffer, "ERR", 3);
ret = -1;
} else {
strncpy(buffer, "OK", 2);
}
return ret;
}

152
verifier.c
View File

@ -1,10 +1,8 @@
#include "verifier.h"
typedef enum verifierstate {
ON,
ASKISSUER,
GOTISSUER,
ASKATTEST,
} verifierstate_e;
typedef struct verifier {
@ -15,21 +13,50 @@ typedef struct verifier {
} verifier_t;
verifier_t verifier;
uint8_t msg[MAX_MSGSIZE];
size_t msg_len;
uint8_t chksum[MAX_CHKSUMSIZE];
size_t chksum_len;
int verifier_getissuer(char *buffer);
//int verifier_getmember(char *buffer);
int verifier_attestmember(char *buffer);
int verifier_checklink(char *buffer);
int verifier_checkattest(char *buffer);
int verifier_verifymsg(char *buffer);
int main() {
verifier.revocations.sk_list = NULL;
verifier.revocations.bsn_list = NULL;
char *remote_ip;
if (2 != server_start(&process_verifier, VERIFIERPORT)) {
switch(argc) {
case 1:
if (0 != ecdaa_issuer_public_key_FP256BN_deserialize_file(&verifier.ipk, verifier_ipk_file)) {
printf("Could not import key file. Importing from %s was not successful",verifier_ipk_file);
return 1;
}
verifier.state = GOTISSUER;
break;
case 3:
if( 0 == strncasecmp("--public", argv[1], 6) || 0 == strncasecmp("-p", argv[1], 2)) {
verifier.state = ON;
remote_ip = argv[2];
ret = client_connect(&verifier_getissuer, remote_ip, VERIFIERPORT);
if (0 >= ret || GOTISSUER != verifier.state) {
printf("connection to issuer failed\n");
}
} else {
printf("arguments invalid\n");
}
break;
default:
printf("Usage: \n Get issuer's public key: %s --public <issuer's IPv4>\n", argv[0]);
printf("If the public key is already saved, no arguments are needed\n");
break;
}
if (GOTISSUER == verifier.state && 2 != server_start(&process_verifier, VERIFIERPORT)) {
printf("server failed\n");
}
return 0;
@ -42,9 +69,7 @@ int process_verifier(char *buffer) {
printf("> VERIFIER: %s\n", buffer);
if (0 == strncasecmp("VERIFYMSG", buffer, 9)) {
switch (verifier.state) {
case GOTISSUER:
ret = verifier_checkattest(&buffer[10]);
ret = verifier_verifymsg(&buffer[10]);
bzero(buffer, MAX_BUFSIZE);
if (-1 == ret) {
printf("process_verifier: member public key is malformed!\n");
@ -56,44 +81,6 @@ int process_verifier(char *buffer) {
strncpy(buffer, "OK\n", 3);
}
break;
default:
bzero(buffer, MAX_BUFSIZE);
strncpy(buffer, "ERR\n", 4);
}
ret = 0;
} else if (0 == strncasecmp("ATTEST", buffer, 6)) {
strncpy(remote_ip, &buffer[7], 15);
ret = client_connect(&verifier_attestmember, remote_ip, MEMBERPORT);
if (0 >= ret) {
printf("process_verifier: member verification failed\n");
bzero(buffer, MAX_BUFSIZE);
strncpy(buffer, "ERR\n", 4);
} else {
bzero(buffer, MAX_BUFSIZE);
strncpy(buffer, "OK\n", 3);
}
ret = 0;
} else if (0 == strncasecmp("LINK", buffer, 4)) {
bzero(buffer, MAX_BUFSIZE);
verifier_checklink(buffer);
} else if (0 == strncasecmp("GETPUBLIC", buffer, 9)) {
verifier.state = ON;
int iplen = strlen(&buffer[10]);
if (iplen >= 7 && iplen <= 15) {
strncpy(remote_ip, &buffer[10], 15);
ret = client_connect(&verifier_getissuer, remote_ip, ISSUERPORT);
if (0 >= ret || GOTISSUER != verifier.state) {
printf("process_verifier: issuer connection failed\n");
bzero(buffer, MAX_BUFSIZE);
strncpy(buffer, "ERR\n", 4);
} else {
bzero(buffer, MAX_BUFSIZE);
strncpy(buffer, "OK\n", 3);
}
} else {
printf("process_verifier: no valid ip\n");
bzero(buffer, MAX_BUFSIZE);
strncpy(buffer, "ERR\n", 4);
}
ret = 0;
} else if (0 == strncasecmp("EXIT", buffer, 4)) {
@ -116,7 +103,6 @@ int process_verifier(char *buffer) {
return ret;
}
//"GETPUBLIC <IPv4>" > "OK"
int verifier_getissuer(char *buffer) {
int ret = 0;
@ -158,50 +144,10 @@ int verifier_getissuer(char *buffer) {
return ret;
}
int verifier_attestmember(char *buffer) {
int ret = 0;
switch (verifier.state) {
case GOTISSUER:
bzero(buffer, MAX_BUFSIZE);
strncpy(buffer, "ATTEST\n", 7);
verifier.state = ASKATTEST;
break;
case ASKATTEST:
if (0 == strncasecmp("ATTEST", buffer, 6)) {
printf("MEMBER > VERIFIER: %s", buffer);
ret = verifier_checkattest(&buffer[7]);
if (-1 == ret) {
printf("verifier_attestmember: group public key is malformed!\n");
ret = -1;
} else if (-2 == ret) {
printf("verifier_attestmember: signature of group public key is invalid\n");
ret = -1;
} else {
verifier.state = GOTISSUER;
ret = 1;
}
} else {
printf("verifier_attestmember: did not get correct message from member\n");
ret = -1;
}
break;
default:
ret = -1;
}
if (0 == ret) {
printf("MEMBER < VERIFIER: %s", buffer);
}
return ret;
}
//"ATTEST <msg>0<signature w/o bsn>" or
//"ATTEST <msg>1<signature with bsn>"
int verifier_checkattest(char *buffer) {
int verifier_verifymsg(char *buffer) {
char *current = buffer;
char msg[MAX_MSGSIZE];
size_t msg_len = 0;
int has_nym = 0;
char bsn[MAX_BSNSIZE];
size_t bsn_len = 0;
@ -213,7 +159,11 @@ int verifier_checkattest(char *buffer) {
bzero(msg, MAX_MSGSIZE);
ret = ecdaa_decode(current, msg, MAX_MSGSIZE);
msg_len = strlen(msg);
current = &current[2 * MAX_MSGSIZE];
current = &current[ret];
bzero(chksum, MAX_CHKSUMSIZE);
ret = ecdaa_decode(current, chksum, MAX_CHKSUMSIZE);
chksum_len = strlen(chksum);
current = &current[ret];
has_nym = current[0] - '0';
current = &current[1];
@ -224,36 +174,32 @@ int verifier_checkattest(char *buffer) {
current = &current[MAX_BSNSIZE];
sig_len = ecdaa_signature_FP256BN_with_nym_length();
} else {
sig_len = ecdaa_signature_FP256BN_length();
}
bzero(binbuf, MAX_BUFSIZE);
ecdaa_decode(current, binbuf, sig_len);
ret = ecdaa_signature_FP256BN_deserialize(&sig, binbuf, has_nym);
if (0 != ret) {
printf("verifier_checkattest: error reading signature\n");
printf("verifier_verifymsg: error reading signature\n");
return -1;
}
printf("verifier_checkattest: msg: %s, len: %lu\n",msg, msg_len);
printf("verifier_checkattest: bsn: %s, len: %lu\n",bsn, bsn_len);
printf("verifier_checkattest: sig: %s, len: %lu\n", current, sig_len);
printf("verifier_verifymsg: has_nym: %u, sig_len: %lu\n", has_nym, sig_len);
printf("verifier_verifymsg: msg: %s, len: %lu\n", msg, msg_len);
printf("verifier_verifymsg: chksum: %s, len: %lu\n", chksum, chksum_len);
printf("verifier_verifymsg: bsn: %s, len: %lu\n", bsn, bsn_len);
printf("verifier_verifymsg: sig: %s, len: %lu\n", current, sig_len);
ret = ecdaa_signature_FP256BN_verify(&sig, &verifier.ipk.gpk, &verifier.revocations, (uint8_t *) msg, msg_len,
(uint8_t *) bsn, bsn_len);
if (0 != ret) {
printf("verifier_checkattest: signature not valid, ret = %i\n", ret);
printf("verifier_verifymsg: signature not valid, ret = %i\n", ret);
return -1;
}
printf("writing message to %s\n", verifier_message_file);
ecdaa_write_buffer_to_file(verifier_message_file, msg, msg_len);
return 0;
}
//"LINK" > "NOT IMPLEMENTED"
int verifier_checklink(char *buffer) {
strncat(buffer, "NOT_IMPLEMENTED\n", 17);
ecdaa_write_buffer_to_file(MSGFILE, msg, msg_len);
ecdaa_write_buffer_to_file(CHKSUMFILE, chksum, chksum_len);
return 0;
}

1
verifier.h
View File

@ -8,6 +8,5 @@
#include "common.h"
int process_verifier(char *buffer);
const char* verifier_message_file = "vmsg.txt";
#endif //ECDAA_VERIFIER_H

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