Encrypting against a SHA1 hash and with a different secret per number
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aa1cd2ced4
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@ -25,6 +25,7 @@
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#include <stdio.h>
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#include <string.h>
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#include <errno.h>
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#include <openssl/sha.h>
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#include <System.h>
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#include "Phone.h"
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@ -34,8 +35,8 @@
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/* types */
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typedef struct _SMSCrypt
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{
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char * secret;
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size_t secret_len;
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unsigned char buf[20];
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size_t len;
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} SMSCrypt;
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@ -43,6 +44,7 @@ typedef struct _SMSCrypt
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static int _smscrypt_init(PhonePlugin * plugin);
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static int _smscrypt_destroy(PhonePlugin * plugin);
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static int _smscrypt_event(PhonePlugin * plugin, PhoneEvent event, ...);
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static int _smscrypt_secret(PhonePlugin * plugin, char const * number);
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static void _smscrypt_settings(PhonePlugin * plugin);
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@ -67,24 +69,14 @@ PhonePlugin plugin =
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static int _smscrypt_init(PhonePlugin * plugin)
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{
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SMSCrypt * smscrypt;
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char const * secret;
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if((secret = plugin->helper->config_get(plugin->helper->phone,
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"smscrypt", "secret")) == NULL)
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return 1;
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#ifdef DEBUG
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fprintf(stderr, "DEBUG: %s() secret=\"%s\"\n", __func__, secret);
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#endif
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if((smscrypt = malloc(sizeof(*smscrypt))) == NULL)
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return error_set_code(1, "%s", strerror(errno));
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plugin->priv = smscrypt;
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smscrypt->secret = strdup(secret);
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smscrypt->secret_len = strlen(secret);
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if(smscrypt->secret == NULL || smscrypt->secret_len == 0)
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{
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_smscrypt_destroy(plugin);
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return error_set_code(1, "%s", strerror(errno));
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}
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smscrypt->len = sizeof(smscrypt->buf);
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return 0;
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}
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@ -94,26 +86,22 @@ static int _smscrypt_destroy(PhonePlugin * plugin)
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{
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SMSCrypt * smscrypt = plugin->priv;
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if(smscrypt->secret != NULL)
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memset(smscrypt->secret, 0, smscrypt->secret_len);
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free(smscrypt->secret);
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free(smscrypt);
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return 0;
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}
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/* smscrypt_event */
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static int _smscrypt_event_sms_receiving(SMSCrypt * smscrypt,
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static int _smscrypt_event_sms_receiving(PhonePlugin * plugin,
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char const * number, PhoneEncoding * encoding, char ** buf,
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size_t * len);
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static int _smscrypt_event_sms_sending(SMSCrypt * smscrypt,
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static int _smscrypt_event_sms_sending(PhonePlugin * plugin,
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char const * number, PhoneEncoding * encoding, char ** buf,
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size_t * len);
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static int _smscrypt_event(PhonePlugin * plugin, PhoneEvent event, ...)
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{
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int ret = 0;
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SMSCrypt * smscrypt = plugin->priv;
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va_list ap;
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char const * number;
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PhoneEncoding * encoding;
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@ -129,7 +117,7 @@ static int _smscrypt_event(PhonePlugin * plugin, PhoneEvent event, ...)
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encoding = va_arg(ap, PhoneEncoding *);
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buf = va_arg(ap, char **);
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len = va_arg(ap, size_t *);
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ret = _smscrypt_event_sms_receiving(smscrypt, number,
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ret = _smscrypt_event_sms_receiving(plugin, number,
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encoding, buf, len);
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break;
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case PHONE_EVENT_SMS_SENDING:
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@ -137,7 +125,7 @@ static int _smscrypt_event(PhonePlugin * plugin, PhoneEvent event, ...)
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encoding = va_arg(ap, PhoneEncoding *);
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buf = va_arg(ap, char **);
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len = va_arg(ap, size_t *);
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ret = _smscrypt_event_sms_sending(smscrypt, number,
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ret = _smscrypt_event_sms_sending(plugin, number,
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encoding, buf, len);
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break;
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/* ignore the rest */
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@ -148,10 +136,11 @@ static int _smscrypt_event(PhonePlugin * plugin, PhoneEvent event, ...)
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return ret;
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}
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static int _smscrypt_event_sms_receiving(SMSCrypt * smscrypt,
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static int _smscrypt_event_sms_receiving(PhonePlugin * plugin,
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char const * number, PhoneEncoding * encoding, char ** buf,
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size_t * len)
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{
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SMSCrypt * smscrypt = plugin->priv;
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size_t i;
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size_t j = 0;
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@ -161,37 +150,66 @@ static int _smscrypt_event_sms_receiving(SMSCrypt * smscrypt,
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#endif
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if(*encoding != PHONE_ENCODING_DATA)
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return 0; /* not for us */
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if(_smscrypt_secret(plugin, number) != 0)
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return 0; /* XXX warn */
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for(i = 0; i < *len; i++)
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{
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(*buf)[i] ^= smscrypt->secret[j++];
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j %= smscrypt->secret_len;
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(*buf)[i] ^= smscrypt->buf[j++];
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j %= smscrypt->len;
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}
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*encoding = PHONE_ENCODING_UTF8;
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return 0;
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}
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static int _smscrypt_event_sms_sending(SMSCrypt * smscrypt,
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static int _smscrypt_event_sms_sending(PhonePlugin * plugin,
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char const * number, PhoneEncoding * encoding, char ** buf,
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size_t * len)
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{
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SMSCrypt * smscrypt = plugin->priv;
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size_t i;
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size_t j = 0;
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#ifdef DEBUG
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fprintf(stderr, "DEBUG: %s(%u, buf, %lu)\n", __func__, *encoding, *len);
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fprintf(stderr, "DEBUG: %s(\"%s\", %u, buf, %lu)\n", __func__, number,
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*encoding, *len);
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#endif
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if(*encoding != PHONE_ENCODING_UTF8)
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return 0; /* not for us */
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if(_smscrypt_secret(plugin, number) != 0)
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return 0; /* XXX warn */
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*encoding = PHONE_ENCODING_DATA;
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for(i = 0; i < *len; i++)
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{
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(*buf)[i] ^= smscrypt->secret[j++];
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j %= smscrypt->secret_len;
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(*buf)[i] ^= smscrypt->buf[j++];
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j %= smscrypt->len;
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}
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*encoding = PHONE_ENCODING_DATA;
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return 0;
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}
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/* smscrypt_secret */
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static int _smscrypt_secret(PhonePlugin * plugin, char const * number)
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{
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SMSCrypt * smscrypt = plugin->priv;
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char const * secret = NULL;
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SHA_CTX sha1;
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if(number != NULL)
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secret = plugin->helper->config_get(plugin->helper->phone,
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"smscrypt", number);
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if(secret == NULL)
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secret = plugin->helper->config_get(plugin->helper->phone,
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"smscrypt", "secret");
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if(secret == NULL)
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return 1;
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SHA1_Init(&sha1);
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SHA1_Update(&sha1, (unsigned char const *)secret, strlen(secret));
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SHA1_Final(smscrypt->buf, &sha1);
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return 0;
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}
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/* smscrypt_settings */
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static void _smscrypt_settings(PhonePlugin * plugin)
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{
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