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-rw-r--r--methods/gpgv.cc87
1 files changed, 70 insertions, 17 deletions
diff --git a/methods/gpgv.cc b/methods/gpgv.cc
index 41f138be6..490833d8c 100644
--- a/methods/gpgv.cc
+++ b/methods/gpgv.cc
@@ -15,6 +15,8 @@
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
+
+#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
@@ -37,14 +39,15 @@ class GPGVMethod : public pkgAcqMethod
{
private:
string VerifyGetSigners(const char *file, const char *outfile,
- vector<string> &GoodSigners,
+ std::string const &key,
+ vector<string> &GoodSigners,
vector<string> &BadSigners,
vector<string> &WorthlessSigners,
vector<string> &NoPubKeySigners);
protected:
- virtual bool Fetch(FetchItem *Itm);
- virtual bool Configuration(string Message);
+ virtual bool URIAcquire(std::string const &Message, FetchItem *Itm) APT_OVERRIDE;
+ virtual bool Configuration(string Message) APT_OVERRIDE;
public:
GPGVMethod() : pkgAcqMethod("1.0",SingleInstance | SendConfig) {};
@@ -61,6 +64,7 @@ bool GPGVMethod::Configuration(string Message)
}
string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
+ std::string const &key,
vector<string> &GoodSigners,
vector<string> &BadSigners,
vector<string> &WorthlessSigners,
@@ -72,6 +76,7 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
std::clog << "inside VerifyGetSigners" << std::endl;
int fd[2];
+ bool const keyIsID = (key.empty() == false && key[0] != '/');
if (pipe(fd) < 0)
return "Couldn't create pipe";
@@ -80,12 +85,13 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
if (pid < 0)
return string("Couldn't spawn new process") + strerror(errno);
else if (pid == 0)
- ExecGPGV(outfile, file, 3, fd);
+ ExecGPGV(outfile, file, 3, fd, (keyIsID ? "" : key));
close(fd[1]);
FILE *pipein = fdopen(fd[0], "r");
// Loop over the output of apt-key (which really is gnupg), and check the signatures.
+ std::vector<std::string> ValidSigners;
size_t buffersize = 0;
char *buffer = NULL;
while (1)
@@ -105,32 +111,31 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
std::clog << "Got BADSIG! " << std::endl;
BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
}
-
- if (strncmp(buffer, GNUPGNOPUBKEY, sizeof(GNUPGNOPUBKEY)-1) == 0)
+ else if (strncmp(buffer, GNUPGNOPUBKEY, sizeof(GNUPGNOPUBKEY)-1) == 0)
{
if (Debug == true)
std::clog << "Got NO_PUBKEY " << std::endl;
NoPubKeySigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
}
- if (strncmp(buffer, GNUPGNODATA, sizeof(GNUPGBADSIG)-1) == 0)
+ else if (strncmp(buffer, GNUPGNODATA, sizeof(GNUPGBADSIG)-1) == 0)
{
if (Debug == true)
std::clog << "Got NODATA! " << std::endl;
BadSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
}
- if (strncmp(buffer, GNUPGKEYEXPIRED, sizeof(GNUPGKEYEXPIRED)-1) == 0)
+ else if (strncmp(buffer, GNUPGKEYEXPIRED, sizeof(GNUPGKEYEXPIRED)-1) == 0)
{
if (Debug == true)
std::clog << "Got KEYEXPIRED! " << std::endl;
WorthlessSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
}
- if (strncmp(buffer, GNUPGREVKEYSIG, sizeof(GNUPGREVKEYSIG)-1) == 0)
+ else if (strncmp(buffer, GNUPGREVKEYSIG, sizeof(GNUPGREVKEYSIG)-1) == 0)
{
if (Debug == true)
std::clog << "Got REVKEYSIG! " << std::endl;
WorthlessSigners.push_back(string(buffer+sizeof(GNUPGPREFIX)));
}
- if (strncmp(buffer, GNUPGGOODSIG, sizeof(GNUPGGOODSIG)-1) == 0)
+ else if (strncmp(buffer, GNUPGGOODSIG, sizeof(GNUPGGOODSIG)-1) == 0)
{
char *sig = buffer + sizeof(GNUPGPREFIX);
char *p = sig + sizeof("GOODSIG");
@@ -141,10 +146,48 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
std::clog << "Got GOODSIG, key ID:" << sig << std::endl;
GoodSigners.push_back(string(sig));
}
+ else if (strncmp(buffer, GNUPGVALIDSIG, sizeof(GNUPGVALIDSIG)-1) == 0)
+ {
+ char *sig = buffer + sizeof(GNUPGVALIDSIG);
+ char *p = sig;
+ while (*p && isxdigit(*p))
+ p++;
+ *p = 0;
+ if (Debug == true)
+ std::clog << "Got VALIDSIG, key ID: " << sig << std::endl;
+ ValidSigners.push_back(string(sig));
+ }
}
fclose(pipein);
free(buffer);
+ // apt-key has a --keyid parameter, but this requires gpg, so we call it without it
+ // and instead check after the fact which keyids where used for verification
+ if (keyIsID == true)
+ {
+ if (Debug == true)
+ std::clog << "GoodSigs needs to be limited to keyid " << key << std::endl;
+ std::vector<std::string>::iterator const foundItr = std::find(ValidSigners.begin(), ValidSigners.end(), key);
+ bool const found = (foundItr != ValidSigners.end());
+ std::copy(GoodSigners.begin(), GoodSigners.end(), std::back_insert_iterator<std::vector<std::string> >(NoPubKeySigners));
+ if (found)
+ {
+ // we look for GOODSIG here as well as an expired sig is a valid sig as well (but not a good one)
+ std::string const goodlongkeyid = "GOODSIG " + key.substr(24, 16);
+ bool const foundGood = std::find(GoodSigners.begin(), GoodSigners.end(), goodlongkeyid) != GoodSigners.end();
+ if (Debug == true)
+ std::clog << "Key " << key << " is valid sig, is " << goodlongkeyid << " also a good one? " << (foundGood ? "yes" : "no") << std::endl;
+ GoodSigners.clear();
+ if (foundGood)
+ {
+ GoodSigners.push_back(goodlongkeyid);
+ NoPubKeySigners.erase(std::remove(NoPubKeySigners.begin(), NoPubKeySigners.end(), goodlongkeyid), NoPubKeySigners.end());
+ }
+ }
+ else
+ GoodSigners.clear();
+ }
+
int status;
waitpid(pid, &status, 0);
if (Debug == true)
@@ -154,8 +197,18 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
if (WEXITSTATUS(status) == 0)
{
- if (GoodSigners.empty())
- return _("Internal error: Good signature, but could not determine key fingerprint?!");
+ if (keyIsID)
+ {
+ // gpgv will report success, but we want to enforce a certain keyring
+ // so if we haven't found the key the valid we found is in fact invalid
+ if (GoodSigners.empty())
+ return _("At least one invalid signature was encountered.");
+ }
+ else
+ {
+ if (GoodSigners.empty())
+ return _("Internal error: Good signature, but could not determine key fingerprint?!");
+ }
return "";
}
else if (WEXITSTATUS(status) == 1)
@@ -174,11 +227,11 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
return _("Unknown error executing apt-key");
}
-bool GPGVMethod::Fetch(FetchItem *Itm)
+bool GPGVMethod::URIAcquire(std::string const &Message, FetchItem *Itm)
{
- URI Get = Itm->Uri;
- string Path = Get.Host + Get.Path; // To account for relative paths
- string keyID;
+ URI const Get = Itm->Uri;
+ string const Path = Get.Host + Get.Path; // To account for relative paths
+ std::string const key = LookupTag(Message, "Signed-By");
vector<string> GoodSigners;
vector<string> BadSigners;
// a worthless signature is a expired or revoked one
@@ -190,7 +243,7 @@ bool GPGVMethod::Fetch(FetchItem *Itm)
URIStart(Res);
// Run apt-key on file, extract contents and get the key ID of the signer
- string msg = VerifyGetSigners(Path.c_str(), Itm->DestFile.c_str(),
+ string msg = VerifyGetSigners(Path.c_str(), Itm->DestFile.c_str(), key,
GoodSigners, BadSigners, WorthlessSigners,
NoPubKeySigners);
if (GoodSigners.empty() || !BadSigners.empty() || !NoPubKeySigners.empty())
generated by cgit v1.2.3 (git 2.25.1) at 2024-05-23 08:57:37 +0000