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POReading and Verifying Certificates
 

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  1. POReading and Verifying Certificates
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    <p>Hi I have two certificates, i.e mycert.crt and root.crt. and I need to verfiy if my certificate is signed by root certificate. I am using the following code to do so using the following code but I am getting an error <strong>Segmentation fault (core dumped)</strong></p> <pre><code>static int verifyCerti (BYTE *cert1, BYTE *cert2, int certlenght1, int certlenght2); int main (int ac, char **av) { FILE *f_in, *f_in2; BYTE *certBuf, *certBuf2; UINT32 certBufLen,certBufLen2; UINT32 certLen,certLen2; int result; //////////// Reading first certificate///// certBufLen = 0; certBuf = malloc (1); //for (i=0; i&lt;nCerts; i++) { if ((f_in = fopen (av[1], "rb")) == NULL) { fprintf (stderr, "Unable to open file %s for input\n", av[1]); exit (1); } fseek (f_in, 0, SEEK_END); certLen = ftell (f_in); fseek (f_in, 0, SEEK_SET); certBuf = realloc (certBuf, certBufLen + certLen); if (fread (certBuf+certBufLen, 1, certLen, f_in) != certLen) { fprintf (stderr, "Failed to read file %s\n", av[1]); exit (1); } if (certBuf[certBufLen] != 0x30) { fprintf (stderr, "Certificate file %s not in binary format\n", av[1]); exit (1); } fclose (f_in); printf ("we reach here %s \n", av[1]); ////////////////Reading second certificate///////////////////////////////////////////////// certBufLen2 = 0; certBuf2 = malloc (1); if ((f_in2 = fopen (av[2], "rb")) == NULL) { fprintf (stderr, "Unable to open file %s for input\n", av[2]); exit (1); } fseek (f_in2, 0, SEEK_END); certLen2 = ftell (f_in2); fseek (f_in2, 0, SEEK_SET); certBuf2 = realloc (certBuf2, certBufLen2 + certLen2); if (fread (certBuf2+certBufLen2, 1, certLen2, f_in2) != certLen2) { fprintf (stderr, "Failed to read file %s\n", av[2]); exit (1); } if (certBuf2[certBufLen2] != 0x30) { fprintf (stderr, "Certificate file %s not in binary format\n", av[2]); exit (1); } fclose (f_in2); printf ("we reach here %s \n", av[2]); if (verifyCerti (certBuf, certBuf2, certBufLen, certBufLen2) &lt; 0) { fprintf (stderr, "Certificate chain is incorrect\n"); exit (1); } } static int verifyCerti (BYTE *cert1, BYTE *cert2, int certLen1, int certLen2) { X509 *root; X509 *mycert; root = d2i_X509 (NULL, (unsigned char const **)&amp;cert2, certLen2); mycert = d2i_X509 (NULL, (unsigned char const **)&amp;cert1, certLen1); //Get root certificate into root //Get mycert into mycert. //Get the public key. EVP_PKEY *pubkey = X509_get_pubkey(root); //verify. result less than or 0 means not verified or some error. int result = X509_verify(mycert, pubkey); //free the public key. EVP_PKEY_free(pubkey); return result; } </code></pre> <p>The error is i think because of X509_verify(), but I am not sure.</p>
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    1. CODid you bother running this under a debugger? And is there any particular reason you're not using `X509 *d2i_X509_fp(FILE *fp, X509 **x)` for your file loads?
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    2. COHave you checked the value of root and mycert before passing to X509_verify? They should be a valid certificate.
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      1. USdoptimusprime
    3. COFor d2i functions, the format of the certificate should be DER. See if the format of the certificate files is DER. If it is other than this, then convert it to DER.
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