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Add mbedtls_x509_dn_gets hexstring output

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If the data is a bitstring or an octet string, instead use the hexstring
of the BER encoding (RFC 4514 Section 2.4)

Signed-off-by: Agathiyan Bragadeesh <agathiyan.bragadeesh2@arm.com>
This commit is contained in:
Agathiyan Bragadeesh 2023-07-26 15:51:49 +01:00
parent ef299d6735
commit ddc720d209
1 changed files with 76 additions and 28 deletions
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104
library/x509.c
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@ -43,6 +43,10 @@
#include "mbedtls/pem.h"
#endif
#if defined(MBEDTLS_ASN1_WRITE_C)
#include "mbedtls/asn1write.h"
#endif
#include "mbedtls/platform.h"
#if defined(MBEDTLS_HAVE_TIME)
@ -822,11 +826,16 @@ static char nibble_to_hex_digit(int i)
int mbedtls_x509_dn_gets(char *buf, size_t size, const mbedtls_x509_name *dn)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t i, j, n;
size_t i, j, n, asn1_len_size;
unsigned char asn1_len_buf[5];
int asn1_len_start;
unsigned char *asn1_len_p;
unsigned char c, merge = 0;
const mbedtls_x509_name *name;
const char *short_name = NULL;
char numericoid[MBEDTLS_X509_MAX_DN_NAME_SIZE];
char s[MBEDTLS_X509_MAX_DN_NAME_SIZE], *p;
int is_numericoid = 0;
memset(s, 0, sizeof(s));
@ -845,43 +854,82 @@ int mbedtls_x509_dn_gets(char *buf, size_t size, const mbedtls_x509_name *dn)
MBEDTLS_X509_SAFE_SNPRINTF;
}
ret = mbedtls_oid_get_attr_short_name(&name->oid, &short_name);
is_numericoid = (name->val.tag == MBEDTLS_ASN1_BIT_STRING) || (name->val.tag == MBEDTLS_ASN1_OCTET_STRING);
if (ret == 0) {
ret = mbedtls_snprintf(p, n, "%s=", short_name);
} else {
ret = mbedtls_snprintf(p, n, "\?\?=");
if(is_numericoid) {
ret = mbedtls_oid_get_numeric_string(numericoid,MBEDTLS_X509_MAX_DN_NAME_SIZE,&name->oid);
if (ret > 0) {
ret = mbedtls_snprintf(p, n, "%s=", numericoid);
} else {
ret = mbedtls_snprintf(p, n, "\?\?=");
}
MBEDTLS_X509_SAFE_SNPRINTF;
}
MBEDTLS_X509_SAFE_SNPRINTF;
for (i = 0, j = 0; i < name->val.len; i++, j++) {
if (j >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
else {
ret = mbedtls_oid_get_attr_short_name(&name->oid, &short_name);
if (ret == 0) {
ret = mbedtls_snprintf(p, n, "%s=", short_name);
} else {
ret = mbedtls_snprintf(p, n, "\?\?=");
}
MBEDTLS_X509_SAFE_SNPRINTF;
}
c = name->val.p[i];
// Special characters requiring escaping, RFC 4514 Section 2.4
if (c) {
if (strchr(",=+<>;\"\\+", c) ||
((i == 0) && strchr("# ", c)) ||
((i == name->val.len-1) && (c == ' '))) {
if (j + 1 >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
s[j++] = '\\';
}
}
if (c < 32 || c >= 127) {
if (j + 3 >= sizeof(s) - 1) {
if(is_numericoid) {
s[0] = '#';
c = name->val.tag;
char lowbits = (c & 0x0F);
char highbits = c>>4;
s[1] = nibble_to_hex_digit(highbits);
s[2] = nibble_to_hex_digit(lowbits);
asn1_len_p = asn1_len_buf+5;
asn1_len_size = mbedtls_asn1_write_len(&asn1_len_p,asn1_len_buf,name->val.len);
asn1_len_start = 5 - asn1_len_size;
for (i = 0, j = 3; i < asn1_len_size + name->val.len; i++, j++) {
if (j + 1 >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
s[j++] = '\\';
if(i < asn1_len_size) {
c = asn1_len_buf[asn1_len_start+i];
}
else {
c = name->val.p[i-asn1_len_size];
}
char lowbits = (c & 0x0F);
char highbits = c>>4;
s[j++] = nibble_to_hex_digit(highbits);
s[j] = nibble_to_hex_digit(lowbits);
} else {
s[j] = c;
}
} else {
for (i = 0, j = 0; i < name->val.len; i++, j++) {
if (j >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
c = name->val.p[i];
// Special characters requiring escaping, RFC 4514 Section 2.4
if (c) {
if (strchr(",=+<>;\"\\+", c) ||
((i == 0) && strchr("# ", c)) ||
((i == name->val.len-1) && (c == ' '))) {
if (j + 1 >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
s[j++] = '\\';
}
}
if (c < 32 || c >= 127) {
if (j + 3 >= sizeof(s) - 1) {
return MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
}
s[j++] = '\\';
char lowbits = (c & 0x0F);
char highbits = c>>4;
s[j++] = nibble_to_hex_digit(highbits);
s[j] = nibble_to_hex_digit(lowbits);
} else {
s[j] = c;
}
}
}
s[j] = '\0';