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core: Handle multiple TOFU_USER lines in verify

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* src/verify.c (op_data_t): Add conflict_user_seen.
(parse_tofu_user): Return ERR_DUP_VALUE for mutltiple TOFU_USERS.
(_gpgme_verify_status_handler): Handle ERR_DUP_VALUE from
parse_tofu_user to ignore the next TOFU_STATS.

--
This fixes TOFU Conflict verification with GnuPG-2.1.17 and 2.1.18

GnuPG-Bug-Id: 2914
This commit is contained in:
Andre Heinecke 2017-02-02 14:02:31 +01:00
parent 15050ce5fc
commit 195c735892
1 changed files with 31 additions and 8 deletions
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39
src/verify.c
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@ -46,6 +46,7 @@ typedef struct
int did_prepare_new_sig;
int only_newsig_seen;
int plaintext_seen;
int conflict_user_seen;
} *op_data_t;
@ -680,6 +681,14 @@ parse_tofu_user (gpgme_signature_t sig, char *args, gpgme_protocol_t protocol)
goto leave;
}
if (sig->key && sig->key->fpr && strcmp (sig->key->fpr, fpr))
{
/* GnuPG since 2.1.17 emits multiple TOFU_USER lines with
different fingerprints in case of conflicts for a signature. */
err = GPG_ERR_DUP_VALUE;
goto leave;
}
args = tail;
tail = strchr (args, ' ');
if (tail == args)
@ -708,12 +717,6 @@ parse_tofu_user (gpgme_signature_t sig, char *args, gpgme_protocol_t protocol)
err = trace_gpg_error (GPG_ERR_INTERNAL);
goto leave;
}
else if (strcmp (sig->key->fpr, fpr))
{
/* The engine did not emit NEWSIG before a new key. */
err = trace_gpg_error (GPG_ERR_INV_ENGINE);
goto leave;
}
err = _gpgme_key_append_name (sig->key, address, 0);
if (err)
@ -930,6 +933,7 @@ _gpgme_verify_status_handler (void *priv, gpgme_status_code_t code, char *args)
calc_sig_summary (sig);
err = prepare_new_sig (opd);
opd->only_newsig_seen = 1;
opd->conflict_user_seen = 0;
return err;
case GPGME_STATUS_GOODSIG:
@ -995,16 +999,35 @@ _gpgme_verify_status_handler (void *priv, gpgme_status_code_t code, char *args)
case GPGME_STATUS_TOFU_USER:
opd->only_newsig_seen = 0;
return sig ? parse_tofu_user (sig, args, ctx->protocol)
/* */ : trace_gpg_error (GPG_ERR_INV_ENGINE);
if (!sig)
return trace_gpg_error (GPG_ERR_INV_ENGINE);
err = parse_tofu_user (sig, args, ctx->protocol);
/* gpg emits TOFU User lines for each conflicting key.
GPGME does not expose this to have a clean API and
a GPGME user can do a keylisting with the address
normalisation.
So when a duplicated TOFU_USER line is encountered
we ignore the conflicting tofu stats emited afterwards.
*/
if (err == GPG_ERR_DUP_VALUE)
{
opd->conflict_user_seen = 1;
break;
}
opd->conflict_user_seen = 0;
return trace_gpg_error (err);
case GPGME_STATUS_TOFU_STATS:
opd->only_newsig_seen = 0;
if (opd->conflict_user_seen)
break;
return sig ? parse_tofu_stats (sig, args)
/* */ : trace_gpg_error (GPG_ERR_INV_ENGINE);
case GPGME_STATUS_TOFU_STATS_LONG:
opd->only_newsig_seen = 0;
if (opd->conflict_user_seen)
break;
return sig ? parse_tofu_stats_long (sig, args, ctx->raw_description)
/* */ : trace_gpg_error (GPG_ERR_INV_ENGINE);