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Adjust test case with invalid base64

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Now that Base64 validates the number of trailing equals, adjust the PEM test
case that has a Base64 payload with a wrong number of trailing equals, where
`mbedtls_pem_read_buffer()` now returns a different error code. I'm not sure
what the exact intent of the test was, so add a variant with trailing equals
as well.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2025-06-10 09:42:03 +02:00
parent 13cc0c2122
commit 55d211388a
2 changed files with 17 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
tests/suites/test_suite_pem.data
View File

@@ -49,13 +49,21 @@ PEM read (malformed PEM DES-EDE3-CBC)
depends_on:MBEDTLS_MD_CAN_MD5:MBEDTLS_DES_C:MBEDTLS_CIPHER_MODE_CBC
mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: DES-EDE3-CBC,AA94892A169FA426\n\nMAAA\n-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH:""
PEM read (malformed PEM AES-128-CBC)
PEM read (malformed PEM AES-128-CBC: 3-byte ciphertext)
depends_on:MBEDTLS_MD_CAN_MD5:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_CBC
mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-128-CBC,AA94892A169FA426AA94892A169FA426\n\nMAAA\n-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH:""
PEM read (malformed PEM AES-128-CBC with fewer than 4 base64 chars)
PEM read (malformed PEM AES-128-CBC: 1-byte ciphertext)
depends_on:MBEDTLS_MD_CAN_MD5:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_CBC
mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-128-CBC,7BA38DE00F67851E4207216809C3BB15\n\n8Q-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_PEM_INVALID_DATA:""
mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-128-CBC,7BA38DE00F67851E4207216809C3BB15\n\n8Q==-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH:""
PEM read (malformed PEM AES-128-CBC: empty ciphertext)
depends_on:MBEDTLS_MD_CAN_MD5:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_CBC
mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-128-CBC,7BA38DE00F67851E4207216809C3BB15\n\n-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_PEM_BAD_INPUT_DATA:""
PEM read (malformed PEM AES-128-CBC: base64 with missing equals)
depends_on:MBEDTLS_MD_CAN_MD5:MBEDTLS_AES_C:MBEDTLS_CIPHER_MODE_CBC
mbedtls_pem_read_buffer:"-----BEGIN EC PRIVATE KEY-----":"-----END EC PRIVATE KEY-----":"-----BEGIN EC PRIVATE KEY-----\nProc-Type\: 4,ENCRYPTED\nDEK-Info\: AES-128-CBC,7BA38DE00F67851E4207216809C3BB15\n\n8Q-----END EC PRIVATE KEY-----":"pwd":MBEDTLS_ERR_PEM_INVALID_DATA + MBEDTLS_ERR_BASE64_INVALID_CHARACTER:""
# The output sequence's length is not multiple of block size (16 bytes). This
# proves that the pem_context->len value is properly updated based on the SEQUENCE

13
tests/suites/test_suite_pem.function
View File

@@ -15,16 +15,16 @@ void mbedtls_pem_write_buffer(char *start, char *end, data_t *buf,
ret = mbedtls_pem_write_buffer(start, end, buf->x, buf->len, NULL, 0, &olen);
TEST_ASSERT(ret == MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL);
TEST_EQUAL(ret, MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL);
check_buf = (unsigned char *) mbedtls_calloc(1, olen);
TEST_ASSERT(check_buf != NULL);
ret = mbedtls_pem_write_buffer(start, end, buf->x, buf->len, check_buf, olen, &olen2);
TEST_ASSERT(olen2 <= olen);
TEST_ASSERT(olen > strlen((char *) result_str));
TEST_ASSERT(ret == 0);
TEST_LE_U(olen2, olen);
TEST_LE_U(strlen((char *) result_str) + 1, olen);
TEST_EQUAL(ret, 0);
TEST_ASSERT(strncmp((char *) check_buf, (char *) result_str, olen) == 0);
exit:
@@ -76,15 +76,14 @@ void mbedtls_pem_read_buffer(char *header, char *footer, char *data,
ret = mbedtls_pem_read_buffer(&ctx, header, footer, (unsigned char *) data,
(unsigned char *) pwd, pwd_len, &use_len);
TEST_ASSERT(ret == res);
TEST_EQUAL(ret, res);
if (ret != 0) {
goto exit;
}
use_len = 0;
buf = mbedtls_pem_get_buffer(&ctx, &use_len);
TEST_EQUAL(use_len, out->len);
TEST_ASSERT(memcmp(out->x, buf, out->len) == 0);
TEST_MEMORY_COMPARE(out->x, out->len, buf, use_len);
exit:
mbedtls_pem_free(&ctx);