#ifndef lint
static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/tcpdump/print-esp.c,v 1.39 2003-05-02 08:43:28 guy Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/tcpdump/print-esp.c,v 1.40 2003-07-17 11:01:06 itojun Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
extern char *strsep (char **stringp, const char *delim); /* Missing/strsep.c */
#endif
-#define AVOID_CHURN 1
#include "interface.h"
#include "addrtoname.h"
#include "extract.h"
-enum cipher { NONE,
- DESCBC,
- BLOWFISH,
- RC5,
- CAST128,
- DES3CBC};
-
-
+enum cipher { NONE, DESCBC, BLOWFISH, RC5, CAST128, DES3CBC};
struct esp_algorithm {
- const char *name;
- enum cipher algo;
- int ivlen;
- int authlen;
- int replaysize; /* number of bytes, in excess of 4,
- may be negative */
+ const char *name;
+ enum cipher algo;
+ int ivlen;
+ int authlen;
+ int replaysize; /* number of bytes, in excess of 4,
+ may be negative */
};
struct esp_algorithm esp_xforms[]={
#endif /* HAVE_SOCKADDR_STORAGE */
struct sa_list {
- struct sa_list *next;
- struct sockaddr_storage daddr;
- u_int32_t spi;
- struct esp_algorithm *xform;
- char secret[256]; /* is that big enough for all secrets? */
- int secretlen;
+ struct sa_list *next;
+ struct sockaddr_storage daddr;
+ u_int32_t spi;
+ struct esp_algorithm *xform;
+ char secret[256]; /* is that big enough for all secrets? */
+ int secretlen;
};
-static struct sa_list *sa_list_head=NULL;
-static struct sa_list *sa_default=NULL;
+static struct sa_list *sa_list_head = NULL;
+static struct sa_list *sa_default = NULL;
static void esp_print_addsa(struct sa_list *sa, int sa_def)
{
- /* copy the "sa" */
+ /* copy the "sa" */
- struct sa_list *nsa;
+ struct sa_list *nsa;
- nsa = (struct sa_list *)malloc(sizeof(struct sa_list));
- if (nsa == NULL)
- error("ran out of memory to allocate sa structure");
+ nsa = (struct sa_list *)malloc(sizeof(struct sa_list));
+ if (nsa == NULL)
+ error("ran out of memory to allocate sa structure");
- *nsa = *sa;
+ *nsa = *sa;
- if(sa_def) {
- sa_default = nsa;
- }
+ if (sa_def)
+ sa_default = nsa;
- nsa->next = sa_list_head;
- sa_list_head = nsa;
+ nsa->next = sa_list_head;
+ sa_list_head = nsa;
}
static int hexdigit(char hex)
{
- if(hex >= '0' && hex <= '9') {
+ if (hex >= '0' && hex <= '9')
return (hex - '0');
- } else if(hex >= 'A' && hex <= 'F') {
+ else if (hex >= 'A' && hex <= 'F')
return (hex - 'A' + 10);
- } else if(hex >= 'a' && hex <= 'f') {
+ else if (hex >= 'a' && hex <= 'f')
return (hex - 'a' + 10);
- } else {
+ else {
printf("invalid hex digit %c in espsecret\n", hex);
return 0;
}
{
int byte;
- byte = (hexdigit(hexstring[0]) << 4) +
- hexdigit(hexstring[1]);
+ byte = (hexdigit(hexstring[0]) << 4) + hexdigit(hexstring[1]);
return byte;
}
* causes us to go read from this file instead.
*
*/
-
static void esp_print_decode_onesecret(char *line)
{
- struct esp_algorithm *xf;
- struct sa_list sa1;
- int sa_def;
-
- char *spikey;
- char *decode;
-
- spikey = strsep(&line, " \t");
- sa_def = 0;
- memset(&sa1, 0, sizeof(struct sa_list));
-
- /* if there is only one token, then it is an algo:key token */
- if(line == NULL) {
- decode = spikey;
- spikey = NULL;
- /* memset(&sa1.daddr, 0, sizeof(sa1.daddr)); */
- /* sa1.spi = 0; */
- sa_def = 1;
- } else {
- decode = line;
- }
-
- if(spikey && strcasecmp(spikey, "file")==0) {
- /* open file and read it */
- FILE *secretfile;
- char fileline[1024];
- char *nl;
-
- secretfile = fopen(line, FOPEN_READ_TXT);
- if(secretfile == NULL) {
- perror(line);
- exit(3);
- }
-
- while(fgets(fileline, sizeof(fileline)-1, secretfile) != NULL) {
-
- /* remove newline from the line */
- nl = strchr(fileline, '\n');
- if(nl) {
- *nl = '\0';
- }
- if(fileline[0]=='#') continue;
- if(fileline[0]=='\0') continue;
-
- esp_print_decode_onesecret(fileline);
- }
- fclose(secretfile);
-
- return;
- }
-
- if(spikey) {
- char *spistr, *foo;
- u_int32_t spino;
- struct sockaddr_in *sin;
+ struct esp_algorithm *xf;
+ struct sa_list sa1;
+ int sa_def;
+
+ char *spikey;
+ char *decode;
+
+ spikey = strsep(&line, " \t");
+ sa_def = 0;
+ memset(&sa1, 0, sizeof(struct sa_list));
+
+ /* if there is only one token, then it is an algo:key token */
+ if (line == NULL) {
+ decode = spikey;
+ spikey = NULL;
+ /* memset(&sa1.daddr, 0, sizeof(sa1.daddr)); */
+ /* sa1.spi = 0; */
+ sa_def = 1;
+ } else
+ decode = line;
+
+ if (spikey && strcasecmp(spikey, "file") == 0) {
+ /* open file and read it */
+ FILE *secretfile;
+ char fileline[1024];
+ char *nl;
+
+ secretfile = fopen(line, FOPEN_READ_TXT);
+ if (secretfile == NULL) {
+ perror(line);
+ exit(3);
+ }
+
+ while (fgets(fileline, sizeof(fileline)-1, secretfile) != NULL) {
+ /* remove newline from the line */
+ nl = strchr(fileline, '\n');
+ if (nl)
+ *nl = '\0';
+ if (fileline[0] == '#') continue;
+ if (fileline[0] == '\0') continue;
+
+ esp_print_decode_onesecret(fileline);
+ }
+ fclose(secretfile);
+
+ return;
+ }
+
+ if (spikey) {
+ char *spistr, *foo;
+ u_int32_t spino;
+ struct sockaddr_in *sin;
#ifdef INET6
- struct sockaddr_in6 *sin6;
+ struct sockaddr_in6 *sin6;
#endif
- spistr = strsep(&spikey, "@");
-
- spino = strtoul(spistr, &foo, 0);
- if(spistr == foo || !spikey) {
- printf("print_esp: failed to decode spi# %s\n", foo);
- return;
- }
+ spistr = strsep(&spikey, "@");
+
+ spino = strtoul(spistr, &foo, 0);
+ if (spistr == foo || !spikey) {
+ printf("print_esp: failed to decode spi# %s\n", foo);
+ return;
+ }
- sa1.spi = spino;
+ sa1.spi = spino;
- sin = (struct sockaddr_in *)&sa1.daddr;
+ sin = (struct sockaddr_in *)&sa1.daddr;
#ifdef INET6
- sin6 = (struct sockaddr_in6 *)&sa1.daddr;
- if(inet_pton(AF_INET6, spikey, &sin6->sin6_addr) == 1) {
+ sin6 = (struct sockaddr_in6 *)&sa1.daddr;
+ if (inet_pton(AF_INET6, spikey, &sin6->sin6_addr) == 1) {
#ifdef HAVE_SOCKADDR_SA_LEN
- sin6->sin6_len = sizeof(struct sockaddr_in6);
+ sin6->sin6_len = sizeof(struct sockaddr_in6);
#endif
- sin6->sin6_family = AF_INET6;
- } else
+ sin6->sin6_family = AF_INET6;
+ } else
#endif
- if(inet_pton(AF_INET, spikey, &sin->sin_addr) == 1) {
+ if (inet_pton(AF_INET, spikey, &sin->sin_addr) == 1) {
#ifdef HAVE_SOCKADDR_SA_LEN
- sin->sin_len = sizeof(struct sockaddr_in);
+ sin->sin_len = sizeof(struct sockaddr_in);
#endif
- sin->sin_family = AF_INET;
- } else {
- printf("print_esp: can not decode IP# %s\n", spikey);
- return;
- }
- }
-
- if(decode) {
- char *colon;
- char espsecret_key[256];
- unsigned int len, i;
-
- /* skip any blank spaces */
- while(isspace((unsigned char)*decode)) decode++;
-
- colon = strchr(decode, ':');
- if(colon == NULL) {
- printf("failed to decode espsecret: %s\n", decode);
- return;
- }
-
- len = colon - decode;
- xf = esp_xforms;
- while(xf->name && strncasecmp(decode, xf->name, len)!=0) {
- xf++;
- }
- if(xf->name == NULL) {
- printf("failed to find cipher algo %s\n", decode);
- /* set to NULL transform */
- return;
- }
- sa1.xform = xf;
-
- colon++;
- if(colon[0]=='0' && colon[1]=='x') {
- /* decode some hex! */
- colon+=2;
- len = strlen(colon) / 2;
-
- if(len > 256) {
- printf("secret is too big: %d\n", len);
- return;
- }
-
- i = 0;
- while(colon[0] != '\0' && colon[1]!='\0') {
- espsecret_key[i]=hex2byte(colon);
- colon+=2;
- i++;
- }
- memcpy(sa1.secret, espsecret_key, i);
- sa1.secretlen=i;
- } else {
- i = strlen(colon);
- if(i < sizeof(sa1.secret)) {
- memcpy(sa1.secret, espsecret_key, i);
- sa1.secretlen = i;
- } else {
- memcpy(sa1.secret, espsecret_key, sizeof(sa1.secret));
- sa1.secretlen = sizeof(sa1.secret);
- }
- }
-
- }
-
- esp_print_addsa(&sa1, sa_def);
+ sin->sin_family = AF_INET;
+ } else {
+ printf("print_esp: can not decode IP# %s\n", spikey);
+ return;
+ }
+ }
+
+ if (decode) {
+ char *colon;
+ char espsecret_key[256];
+ unsigned int len, i;
+
+ /* skip any blank spaces */
+ while (isspace((unsigned char)*decode))
+ decode++;
+
+ colon = strchr(decode, ':');
+ if (colon == NULL) {
+ printf("failed to decode espsecret: %s\n", decode);
+ return;
+ }
+
+ len = colon - decode;
+ xf = esp_xforms;
+ while (xf->name && strncasecmp(decode, xf->name, len) != 0)
+ xf++;
+ if (xf->name == NULL) {
+ printf("failed to find cipher algo %s\n", decode);
+ /* set to NULL transform */
+ return;
+ }
+ sa1.xform = xf;
+
+ colon++;
+ if (colon[0] == '0' && colon[1] == 'x') {
+ /* decode some hex! */
+ colon += 2;
+ len = strlen(colon) / 2;
+
+ if (len > 256) {
+ printf("secret is too big: %d\n", len);
+ return;
+ }
+
+ i = 0;
+ while (colon[0] != '\0' && colon[1]!='\0') {
+ espsecret_key[i] = hex2byte(colon);
+ colon += 2;
+ i++;
+ }
+ memcpy(sa1.secret, espsecret_key, i);
+ sa1.secretlen=i;
+ } else {
+ i = strlen(colon);
+ if (i < sizeof(sa1.secret)) {
+ memcpy(sa1.secret, espsecret_key, i);
+ sa1.secretlen = i;
+ } else {
+ memcpy(sa1.secret, espsecret_key,
+ sizeof(sa1.secret));
+ sa1.secretlen = sizeof(sa1.secret);
+ }
+ }
+ }
+
+ esp_print_addsa(&sa1, sa_def);
}
static void esp_print_decodesecret(void)
{
- char *line;
- char *p;
-
- if(espsecret == NULL) {
- sa_list_head = NULL;
- return;
- }
-
- if(sa_list_head != NULL) {
- return;
- }
-
- p=espsecret;
-
- while(espsecret && espsecret[0]!='\0') {
- /* pick out the first line or first thing until a comma */
- if((line = strsep(&espsecret, "\n,"))==NULL) {
- line=espsecret;
- espsecret=NULL;
- }
-
- esp_print_decode_onesecret(line);
- }
+ char *line;
+ char *p;
+
+ if (espsecret == NULL) {
+ sa_list_head = NULL;
+ return;
+ }
+
+ if (sa_list_head != NULL)
+ return;
+
+ p = espsecret;
+
+ while (espsecret && espsecret[0] != '\0') {
+ /* pick out the first line or first thing until a comma */
+ if ((line = strsep(&espsecret, "\n,")) == NULL) {
+ line = espsecret;
+ espsecret = NULL;
+ }
+
+ esp_print_decode_onesecret(line);
+ }
}
int
printf(")");
/* if we don't have decryption key, we can't decrypt this packet. */
- if(sa_list_head == NULL) {
- if (!espsecret) {
- goto fail;
- }
- esp_print_decodesecret();
+ if (sa_list_head == NULL) {
+ if (!espsecret)
+ goto fail;
+ esp_print_decodesecret();
}
- if(sa_list_head == NULL) {
+ if (sa_list_head == NULL)
goto fail;
- }
ip = (struct ip *)bp2;
switch (IP_V(ip)) {
/* if we didn't find the specific one, then look for
* an unspecified one.
*/
- if(sa == NULL) {
+ if (sa == NULL) {
sa = sa_default;
}
/* if not found fail */
- if(sa == NULL)
+ if (sa == NULL)
goto fail;
/* if we can't get nexthdr, we do not need to decrypt it */
DES_set_key_unchecked((const_DES_cblock *)secret, &schedule);
DES_cbc_encrypt((const unsigned char *)p, p,
- (long)(ep - p), &schedule, (DES_cblock *)iv,
- DES_DECRYPT);
+ (long)(ep - p), &schedule, (DES_cblock *)iv, DES_DECRYPT);
#elif OPENSSL_VERSION_NUMBER >= 0x00907000L
DES_set_key_unchecked((DES_cblock *)secret, schedule);
DES_cbc_encrypt((const unsigned char *)p, p,
- (long)(ep - p), schedule, (DES_cblock *)iv,
- DES_DECRYPT);
+ (long)(ep - p), schedule, (DES_cblock *)iv, DES_DECRYPT);
#else
des_check_key = 0;
des_set_key((void *)secret, schedule);
des_cbc_encrypt((void *)p, (void *)p,
- (long)(ep - p), schedule, (void *)iv,
- DES_DECRYPT);
+ (long)(ep - p), schedule, (void *)iv, DES_DECRYPT);
#endif
advance = ivoff - (u_char *)esp + ivlen;
break;
DES_set_odd_parity((DES_cblock *)(secret + 8));
DES_set_odd_parity((DES_cblock *)(secret + 16));
#if OPENSSL_VERSION_NUMBER >= 0x00908000L
- if(DES_set_key_checked((const_DES_cblock *)secret, &s1) != 0) {
- printf("failed to schedule key 1\n");
- }
- if(DES_set_key_checked((const_DES_cblock *)(secret + 8), &s2)!=0) {
- printf("failed to schedule key 2\n");
- }
- if(DES_set_key_checked((const_DES_cblock *)(secret + 16), &s3)!=0) {
- printf("failed to schedule key 3\n");
- }
+ if (DES_set_key_checked((const_DES_cblock *)secret, &s1) != 0)
+ printf("failed to schedule key 1\n");
+ if (DES_set_key_checked((const_DES_cblock *)(secret + 8), &s2) != 0)
+ printf("failed to schedule key 2\n");
+ if (DES_set_key_checked((const_DES_cblock *)(secret + 16), &s3) != 0)
+ printf("failed to schedule key 3\n");
#else
- if(DES_set_key_checked((DES_cblock *)secret, s1) != 0) {
- printf("failed to schedule key 1\n");
- }
- if(DES_set_key_checked((DES_cblock *)(secret + 8), s2)!=0) {
- printf("failed to schedule key 2\n");
- }
- if(DES_set_key_checked((DES_cblock *)(secret + 16), s3)!=0) {
- printf("failed to schedule key 3\n");
- }
+ if (DES_set_key_checked((DES_cblock *)secret, s1) != 0)
+ printf("failed to schedule key 1\n");
+ if (DES_set_key_checked((DES_cblock *)(secret + 8), s2) != 0)
+ printf("failed to schedule key 2\n");
+ if (DES_set_key_checked((DES_cblock *)(secret + 16), s3) != 0)
+ printf("failed to schedule key 3\n");
#endif
p = ivoff + ivlen;
DES_ede3_cbc_encrypt((const unsigned char *)p, p,
- (long)(ep - p),
- &s1, &s2, &s3,
- (DES_cblock *)ivoff, DES_DECRYPT);
+ (long)(ep - p), &s1, &s2, &s3, (DES_cblock *)ivoff,
+ DES_DECRYPT);
#else
des_key_schedule s1, s2, s3;
des_set_odd_parity((void *)secret);
des_set_odd_parity((void *)(secret + 8));
des_set_odd_parity((void *)(secret + 16));
- if(des_set_key((void *)secret, s1) != 0) {
- printf("failed to schedule key 1\n");
- }
- if(des_set_key((void *)(secret + 8), s2)!=0) {
- printf("failed to schedule key 2\n");
- }
- if(des_set_key((void *)(secret + 16), s3)!=0) {
- printf("failed to schedule key 3\n");
- }
+ if (des_set_key((void *)secret, s1) != 0)
+ printf("failed to schedule key 1\n");
+ if (des_set_key((void *)(secret + 8), s2) != 0)
+ printf("failed to schedule key 2\n");
+ if (des_set_key((void *)(secret + 16), s3) != 0)
+ printf("failed to schedule key 3\n");
p = ivoff + ivlen;
des_ede3_cbc_encrypt((void *)p, (void *)p,
- (long)(ep - p),
- s1, s2, s3,
- (void *)ivoff, DES_DECRYPT);
+ (long)(ep - p), s1, s2, s3, (void *)ivoff, DES_DECRYPT);
#endif
advance = ivoff - (u_char *)esp + ivlen;
break;
projects / tcpdump / commitdiff
