Got it, thank you Matt.
On Mon, Mar 28, 2022 at 6:29 PM Matt Caswell <matt@xxxxxxxxxxx> wrote:
On 28/03/2022 13:11, Brahmaji K wrote:
> Hi Team,
>
> I'm trying to store the invalid EC certificate as a negative test for my
> application. My application calls the X509_STORE_load_locations() to
> load the certificate from a specific path. For invalid EC certificate it
> is expected to FAIL but it is returning the SUCCESS.
>
> I have done some debugging and found the following:
>
> pubkey_cb() calls x509_pubkey_decode(), the x509_pubkey_decode() has the
> check only for -1 as shown below:
>
> 46 if (x509_pubkey_decode(&pubkey->pkey, pubkey) == -1)
> 47 return 0;
>
> But x509_pubkey_decode() can return zero ("0") also in the failure case.
> Is there any intention to have the above check? or is it a known issue?
The fuller context around these lines gives the answer:
/*
* Opportunistically decode the key but remove any non fatal errors
* from the queue. Subsequent explicit attempts to decode/use
the key
* will return an appropriate error.
*/
ERR_set_mark();
if (x509_pubkey_decode(&pubkey->pkey, pubkey) == -1)
return 0;
ERR_pop_to_mark();
The -1 return from x509_pubkey_decode() indicates a fatal error (e.g. a
malloc failure). A 0 error return is considered non-fatal (e.g. an
unrecognised key) and the code is deliberately written to continue in
the case of non-fatal errors.
Matt
>
> Call trace for more information:
> #0 x509_pubkey_decode (ppkey=ppkey@entry=0x123d5ffd0,
> key=key@entry=0x123d5ffc0) at crypto/x509/x_pubkey.c:125
> #1 0x00000001201f5888 in pubkey_cb (operation=operation@entry=5,
> pval=pval@entry=0x123d5fe40, it=it@entry=0x1206026c8,
> exarg=exarg@entry=0x0) at crypto/x509/x_pubkey.c:46
> #2 0x0000000120152bac in asn1_item_embed_d2i (pval=pval@entry=0x123d5fe40,
> in=in@entry=0xffff654288, len=0, it=0x1206026c8, tag=<optimized out>,
> tag@entry=-1, aclass=<optimized out>, aclass@entry=0,
> opt=<optimized out>, ctx=ctx@entry=0xffff6546a0, depth=<optimized out>,
> depth@entry=2) at crypto/asn1/tasn_dec.c:413
> #3 0x0000000120153660 in asn1_template_noexp_d2i (val=0x123d5fe40,
> in=0xffff6543a0, len=322, tt=0x120618ad8, opt=<optimized out>,
> ctx=0xffff6546a0, depth=<optimized out>) at crypto/asn1/tasn_dec.c:624
> #4 0x0000000120153968 in asn1_template_ex_d2i (val=0x123d5fe40,
> in=in@entry=0xffff6543a0, inlen=<optimized out>,
> tt=tt@entry=0x120618ad8,
> opt=<optimized out>, ctx=ctx@entry=0xffff6546a0, depth=depth@entry=2)
> at crypto/asn1/tasn_dec.c:499
> #5 0x0000000120153064 in asn1_item_embed_d2i (pval=pval@entry=0xffff654490,
> in=in@entry=0xffff654488, len=322, it=0x1206027f8, tag=<optimized out>,
> tag@entry=-1, aclass=<optimized out>, aclass@entry=0,
> opt=<optimized out>, ctx=ctx@entry=0xffff6546a0, depth=2,
> depth@entry=1)
> at crypto/asn1/tasn_dec.c:363
> #6 0x0000000120153660 in asn1_template_noexp_d2i (val=0xffff654490,
> in=0xffff6545a0, len=507, tt=0x120618970, opt=<optimized out>,
> ctx=0xffff6546a0, depth=<optimized out>) at crypto/asn1/tasn_dec.c:624
> #7 0x0000000120153968 in asn1_template_ex_d2i (val=0x123d5fdf0,
> in=in@entry=0xffff6545a0, inlen=<optimized out>,
> tt=tt@entry=0x120618970,
> opt=<optimized out>, ctx=ctx@entry=0xffff6546a0, depth=depth@entry=1)
> at crypto/asn1/tasn_dec.c:499
> #8 0x0000000120153064 in asn1_item_embed_d2i (pval=pval@entry=0x123d5ef40,
> in=0xffff654710, len=507, it=it@entry=0x1206027c0, tag=<optimized out>,
> aclass=<optimized out>, opt=<optimized out>, ctx=0xffff6546a0, depth=1,
> depth@entry=0) at crypto/asn1/tasn_dec.c:363
> #9 0x0000000120153ac8 in ASN1_item_ex_d2i (pval=0x123d5ef40,
> in=<optimized out>, len=<optimized out>, it=0x1206027c0,
> tag=<optimized out>, aclass=<optimized out>, opt=<optimized out>,
> ctx=<optimized out>) at crypto/asn1/tasn_dec.c:124
> #10 0x0000000120153b60 in ASN1_item_d2i (pval=0x123d5ef40,
> in=<optimized out>, len=<optimized out>, it=<optimized out>)
> at crypto/asn1/tasn_dec.c:114
> #11 0x00000001202cd744 in PEM_X509_INFO_read_bio (bp=0x123d5ee50, sk=0x0,
> cb=0, u=0x1204ca0c0) at crypto/pem/pem_info.c:195
> #12 0x0000000120285fe8 in X509_load_cert_crl_file (file=<optimized out>,
> ctx=0x123d5f3c0, type=<optimized out>) at crypto/x509/by_file.c:202
> #13 X509_load_cert_crl_file (ctx=0x123d5f3c0, file=<optimized out>,
> type=<optimized out>) at crypto/x509/by_file.c:188
> #14 0x00000001202861c8 in by_file_ctrl (ctx=<optimized out>,
> cmd=<optimized out>, argp=<optimized out>, argl=<optimized out>,
> ret=<optimized out>) at crypto/x509/by_file.c:64
> #15 0x00000001201e60ec in X509_STORE_load_locations (ctx=0x123d5f2c0,
> file=0xffff654868 "/certs/test.crt", path=0x0)
> at crypto/x509/x509_d2.c:44
