/// <summary>
/// Deposit a ballot.
/// </summary>
/// <param name="ballot">Ballot in signed envleope.</param>
/// <returns>Vote receipt signed by the server.</returns>
public Signed<VoteReceipt> Vote(
IRpcConnection connection,
Signed<Envelope> signedEnvelope)
{
if (signedEnvelope == null)
throw new ArgumentNullException("ballot");
if (Status != VotingStatus.Voting)
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Voter id {1} (unverified) tried to vote, but status was {2}.",
connection.Id,
signedEnvelope.Certificate.Id.ToString(),
Status.ToString());
throw new PiArgumentException(ExceptionCode.WrongStatusForOperation, "Wrong status for operation.");
}
if (!signedEnvelope.Verify(this.certificateStorage))
{
if (signedEnvelope.VerifySimple())
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Voter id {1} (unverified) tried to vote, but his certificate had state {2}.",
connection.Id,
signedEnvelope.Certificate.Id.ToString(),
signedEnvelope.Certificate.Validate(this.certificateStorage).Text());
}
else
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Voter id {1} (unverified) tried to vote, but the signature on envelope was invalid.",
connection.Id,
signedEnvelope.Certificate.Id.ToString());
}
throw new PiArgumentException(ExceptionCode.VoteSignatureNotValid, "Vote signature not valid.");
}
if (!(signedEnvelope.Certificate is VoterCertificate))
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Voter id {1} (verified) tried to vote, but his certificate was not a voter certificate.",
connection.Id,
signedEnvelope.Certificate.Id.ToString());
throw new PiArgumentException(ExceptionCode.NoVoterCertificate, "Not a voter certificate.");
}
if (Parameters.GroupId != ((VoterCertificate)signedEnvelope.Certificate).GroupId)
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Voter id {1} (verified) tried to vote, but his group id was {2} when it should have been {3}.",
connection.Id,
signedEnvelope.Certificate.Id.ToString(),
((VoterCertificate)signedEnvelope.Certificate).GroupId,
Parameters.GroupId);
throw new PiArgumentException(ExceptionCode.BadGroupIdInCertificate, "Wrong group id in certificate.");
}
var envelope = signedEnvelope.Value;
if (envelope.Date.Subtract(DateTime.Now).TotalHours < -1d ||
envelope.Date.Subtract(DateTime.Now).TotalHours > 1d)
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Voter id {1} (verified) tried to vote, but the envelope was created at {2} and pushed at {3}.",
connection.Id,
signedEnvelope.Certificate.Id.ToString(),
envelope.Date.ToString(),
DateTime.Now.ToString());
throw new PiArgumentException(ExceptionCode.InvalidEnvelopeBadDateTime, "Invalid envelope. Date out of range.");
}
if (envelope.VoterId != signedEnvelope.Certificate.Id)
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Voter id {1} (verified) tried to vote, but the envelope voter id did not match his certificate.",
connection.Id,
signedEnvelope.Certificate.Id.ToString());
throw new PiArgumentException(ExceptionCode.InvalidEnvelopeBadVoterId, "Invalid envelope. Voter id does not match.");
}
if (envelope.Ballots.Count != Parameters.Questions.Count())
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Voter id {1} (verified) tried to vote, but there were {2} ballots in the envelope for {3} questions.",
connection.Id,
signedEnvelope.Certificate.Id.ToString(),
envelope.Ballots.Count,
Parameters.Questions.Count());
throw new PiArgumentException(ExceptionCode.InvalidEnvelopeBadBallotCount, "Invalid envelope. Ballot count does not match.");
}
for (int questionIndex = 0; questionIndex < parameters.Questions.Count(); questionIndex++)
{
var ballot = envelope.Ballots[questionIndex];
var question = parameters.Questions.ElementAt(questionIndex);
if (ballot.SumProves.Count != parameters.ProofCount)
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Voter id {1} (verified) tried to vote, but there were {2} sum proofs present where there sould have been {3}.",
connection.Id,
signedEnvelope.Certificate.Id.ToString(),
ballot.SumProves.Count,
parameters.ProofCount);
throw new PiArgumentException(ExceptionCode.InvalidEnvelopeBadProofCount, "Invalid envelope. Number of sum prooves does not match.");
}
if (ballot.Votes.Count != question.Options.Count())
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Voter id {1} (verified) tried to vote, but there were {2} votes present for {3} options.",
connection.Id,
signedEnvelope.Certificate.Id.ToString(),
ballot.Votes.Count,
question.Options.Count());
throw new PiArgumentException(ExceptionCode.InvalidEnvelopeBadVoteCount, "Invalid envelope. Vote count does not match.");
}
if (ballot.Votes.Any(vote => vote.RangeProves.Count != parameters.ProofCount))
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Voter id {1} (verified) tried to vote, but there was the wrong number of range proofs on a vote.",
connection.Id,
signedEnvelope.Certificate.Id.ToString());
throw new PiArgumentException(ExceptionCode.InvalidEnvelopeBadProofCount, "Invalid envelope. Number of range prooves does not match.");
}
}
bool hasVoted = DbConnection.ExecuteHasRows(
"SELECT count(*) FROM envelope WHERE VotingId = @VotingId AND VoterId = @VoterId",
"@VotingId", Id.ToByteArray(),
"@VoterId", signedEnvelope.Certificate.Id.ToByteArray());
if (hasVoted)
throw new PiArgumentException(ExceptionCode.AlreadyVoted, "Voter has already voted.");
MySqlTransaction transaction = DbConnection.BeginTransaction();
MySqlCommand indexCommand = new MySqlCommand(
"SELECT max(EnvelopeIndex) + 1 FROM envelope WHERE VotingId = @VotingId",
DbConnection,
transaction);
indexCommand.Add("@VotingId", Id.ToByteArray());
object indexObject = indexCommand.ExecuteScalar();
int envelopeIndex = indexObject == DBNull.Value ? 1 : Convert.ToInt32(indexObject);
MySqlCommand insertCommand = new MySqlCommand(
"INSERT INTO envelope (VotingId, EnvelopeIndex, VoterId, Value) VALUES (@VotingId, @EnvelopeIndex, @VoterId, @Value)",
DbConnection,
transaction);
insertCommand.Add("@VotingId", Id.ToByteArray());
insertCommand.Add("@VoterId", signedEnvelope.Certificate.Id.ToByteArray());
insertCommand.Add("@Value", signedEnvelope.ToBinary());
insertCommand.Add("@EnvelopeIndex", envelopeIndex);
insertCommand.ExecuteNonQuery();
transaction.Commit();
Logger.Log(LogLevel.Info,
"Connection {0}: Envelope for certificate id {1} on voting id {2} stored.",
connection.Id,
signedEnvelope.Certificate.Id.ToString(),
Id.ToString());
VoteReceipt voteReceipt = new VoteReceipt(Parameters, signedEnvelope);
return new Signed<VoteReceipt>(voteReceipt, this.serverCertificate);
}
/// <summary>
/// Deposit partial deciphers from an authority.
/// </summary>
/// <param name="signedPartialDecipherList">Partial decipher list.</param>
public void DepositPartialDecipher(
IRpcConnection connection,
Signed<PartialDecipherList> signedPartialDecipherList)
{
if (signedPartialDecipherList == null)
throw new ArgumentNullException("partialDecipherContainer");
if (Status != VotingStatus.Deciphering)
{
Logger.Log(LogLevel.Warning, "Authority id {0} (unverified) tried to deposit his partial decipher, but the status was {1}.", signedPartialDecipherList.Certificate.Id.ToString(), Status.ToString());
throw new InvalidOperationException("Wrong status for operation.");
}
PartialDecipherList partialDecipherList = signedPartialDecipherList.Value;
Certificate certificate = GetAuthority(partialDecipherList.AuthorityIndex);
if (!signedPartialDecipherList.Verify(this.certificateStorage, Parameters.VotingBeginDate))
{
if (signedPartialDecipherList.VerifySimple())
{
Logger.Log(LogLevel.Warning, "Authority id {0} (unverified) tried to deposit his partial decipher, but his certificate had state {1}.", signedPartialDecipherList.Certificate.Id.ToString(), signedPartialDecipherList.Certificate.Validate(this.certificateStorage, Parameters.VotingBeginDate).Text());
}
else
{
Logger.Log(LogLevel.Warning, "Authority id {0} (unverified) tried to deposit his partial decipher, but the signature was invalid.", signedPartialDecipherList.Certificate.Id.ToString());
}
throw new PiArgumentException(ExceptionCode.InvalidSignature, "Bad signature.");
}
if (!signedPartialDecipherList.Certificate.IsIdentic(certificate))
{
Logger.Log(LogLevel.Warning, "Authority id {0} (verified) tried to deposit his partial decipher, but his certificate did not match id {1} for authority index {2}.", signedPartialDecipherList.Certificate.Id.ToString(), certificate.Id.ToString(), partialDecipherList.AuthorityIndex);
throw new PiArgumentException(ExceptionCode.AuthorityInvalid, "Not signed by proper authority.");
}
if (partialDecipherList.PartialDeciphers.Count < 4)
{
Logger.Log(LogLevel.Warning, "Authority id {0} (verified) tried to deposit his partial decipher, but there were only {1} parts instead of 4.", signedPartialDecipherList.Certificate.Id.ToString(), partialDecipherList.PartialDeciphers.Count);
throw new PiArgumentException(ExceptionCode.AuthorityCountMismatch, "Your Pi-Vote client is outdated.");
}
bool exists = DbConnection.ExecuteHasRows(
"SELECT count(*) FROM deciphers WHERE VotingId = @VotingId AND AuthorityIndex = @AuthorityIndex",
"@VotingId", Id.ToByteArray(),
"@AuthorityIndex", partialDecipherList.AuthorityIndex);
if (exists)
throw new ArgumentException("Authority has already deposited shares.");
MySqlCommand insertCommand = new MySqlCommand("INSERT INTO deciphers (VotingId, AuthorityIndex, Value) VALUES (@VotingId, @AuthorityIndex, @Value)", DbConnection);
insertCommand.Add("@VotingId", Id.ToByteArray());
insertCommand.Add("@AuthorityIndex", partialDecipherList.AuthorityIndex);
insertCommand.Add("@Value", signedPartialDecipherList.ToBinary());
insertCommand.ExecuteNonQuery();
Logger.Log(LogLevel.Info, "Connection {0}: Partical deciphers for certificate id {1} on voting id {2} stored.", connection.Id, signedPartialDecipherList.Certificate.Id.ToString(), Id.ToString());
long depositedShareResponseCount = (long)DbConnection.ExecuteScalar(
"SELECT count(*) FROM deciphers WHERE VotingId = @VotingId",
"@VotingId", Id.ToByteArray());
SendAdminAuthorityActivityMail(certificate, "deposited partial deciphers");
if (depositedShareResponseCount == this.parameters.Thereshold + 1)
{
Status = VotingStatus.Finished;
}
}
/// <summary>
/// Deposit a share part from authorities.
/// </summary>
/// <param name="signedSharePart">Share part.</param>
public void DepositShares(
IRpcConnection connection,
Signed<SharePart> signedSharePart)
{
if (signedSharePart == null)
throw new ArgumentNullException("shares");
if (Status != VotingStatus.New)
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Authority id {1} (unverified) tried to deposit shares, but the status was {2}.",
connection.Id,
signedSharePart.Certificate.Id.ToString(),
Status.ToString());
throw new PiArgumentException(ExceptionCode.WrongStatusForOperation, "Wrong status for operation.");
}
SharePart sharePart = signedSharePart.Value;
Certificate certificate = GetAuthority(sharePart.AuthorityIndex);
if (!signedSharePart.Verify(this.certificateStorage, Parameters.VotingBeginDate))
{
if (signedSharePart.VerifySimple())
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Authority id {1} (unverified) tried to deposit shares, but his certificate had state {2}.",
connection.Id,
signedSharePart.Certificate.Id.ToString(),
signedSharePart.Certificate.Validate(this.certificateStorage, Parameters.VotingBeginDate).Text());
}
else
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Authority id {1} (unverified) tried to deposit shares, but the signature was invalid.",
connection.Id,
signedSharePart.Certificate.Id.ToString());
}
throw new PiSecurityException(ExceptionCode.InvalidSignature, "Bad signature.");
}
if (!signedSharePart.Certificate.IsIdentic(certificate))
{
Logger.Log(LogLevel.Warning,
"Connection {0}: Authority id {1} (verified) tried to deposit shares, but his certificate did not match id {2} for authority index {3}.",
connection.Id,
signedSharePart.Certificate.Id.ToString(),
certificate.Id.ToString(),
sharePart.AuthorityIndex);
throw new PiSecurityException(ExceptionCode.NoAuthorizedAuthority, "Not signed by proper authority.");
}
bool exists = DbConnection.ExecuteHasRows(
"SELECT count(*) FROM sharepart WHERE VotingId = @VotingId AND AuthorityIndex = @AuthorityIndex",
"@VotingId", Id.ToByteArray(),
"@AuthorityIndex", sharePart.AuthorityIndex);
if (exists)
{
Logger.Log(LogLevel.Warning,
"Connection {0}: uthority id {1} (verified) tried to deposit shares, these were already present.",
connection.Id,
signedSharePart.Certificate.Id.ToString());
throw new PiArgumentException(ExceptionCode.AuthorityHasAlreadyDeposited, "Authority has already deposited shares.");
}
MySqlCommand insertCommand = new MySqlCommand("INSERT INTO sharepart (VotingId, AuthorityIndex, Value) VALUES (@VotingId, @AuthorityIndex, @Value)", DbConnection);
insertCommand.Add("@VotingId", Id.ToByteArray());
insertCommand.Add("@AuthorityIndex", sharePart.AuthorityIndex);
insertCommand.Add("@Value", signedSharePart.ToBinary());
insertCommand.ExecuteNonQuery();
Logger.Log(LogLevel.Info,
"Connection {0}: Shares for certificate id {1} on voting id {2} stored.",
connection.Id,
signedSharePart.Certificate.Id.ToString(), Id.ToString());
long depositedSharePartCount = (long)DbConnection.ExecuteScalar(
"SELECT count(*) FROM sharepart WHERE VotingId = @VotingId",
"@VotingId", Id.ToByteArray());
SendAdminAuthorityActivityMail(certificate, "deposited shares");
if (depositedSharePartCount == this.parameters.AuthorityCount)
{
Status = VotingStatus.Sharing;
}
}
/// <summary>
/// Add an authority.
/// </summary>
/// <param name="certificate">Authority to be added.</param>
/// <returns>Index of the authority.</returns>
public int AddAuthority(
IRpcConnection connection,
Certificate certificate)
{
if (certificate == null)
throw new ArgumentNullException("certificate");
if (certificate.Validate(this.certificateStorage) != CertificateValidationResult.Valid)
throw new PiSecurityException(ExceptionCode.InvalidCertificate, "Authority certificate not valid.");
if (!(certificate is AuthorityCertificate))
throw new PiSecurityException(ExceptionCode.NoAuthorizedAuthority, "No an authority certificate.");
MySqlTransaction transaction = DbConnection.BeginTransaction();
MySqlCommand countCommand = new MySqlCommand("SELECT count(*) FROM authority WHERE VotingId = @VotingId", DbConnection, transaction);
countCommand.Add("@VotingId", this.parameters.VotingId.ToByteArray());
if ((long)countCommand.ExecuteScalar() >= this.parameters.AuthorityCount)
throw new PiArgumentException(ExceptionCode.AlreadyEnoughAuthorities, "Already enough authorities.");
MySqlCommand addedCommand = new MySqlCommand("SELECT count(*) FROM authority WHERE VotingId = @VotingId AND AuthorityId = @AuthorityId", DbConnection, transaction);
addedCommand.Add("@VotingId", this.parameters.VotingId.ToByteArray());
addedCommand.Add("@AuthorityId", certificate.Id.ToByteArray());
if (addedCommand.ExecuteHasRows())
throw new PiArgumentException(ExceptionCode.AuthorityAlreadyInVoting, "Already an authority of the voting.");
MySqlCommand indexCommand = new MySqlCommand("SELECT max(AuthorityIndex) + 1 FROM authority WHERE VotingId = @VotingId", DbConnection, transaction);
indexCommand.Add("@VotingId", this.parameters.VotingId.ToByteArray());
object authorityIndexNull = indexCommand.ExecuteScalar();
int authorityIndex = authorityIndexNull == DBNull.Value ? 1 : Convert.ToInt32((long)authorityIndexNull);
MySqlCommand insertCommand = new MySqlCommand("INSERT INTO authority (VotingId, AuthorityIndex, AuthorityId, Certificate) VALUES (@VotingId, @AuthorityIndex, @AuthorityId, @Certificate)", DbConnection, transaction);
insertCommand.Parameters.AddWithValue("@VotingId", this.parameters.VotingId.ToByteArray());
insertCommand.Parameters.AddWithValue("@AuthorityIndex", authorityIndex);
insertCommand.Parameters.AddWithValue("@AuthorityId", certificate.Id.ToByteArray());
insertCommand.Parameters.AddWithValue("@Certificate", certificate.ToBinary());
insertCommand.ExecuteNonQuery();
Logger.Log(LogLevel.Info, "Connection {0}: Authority id {1} added to voting id {2}", connection.Id, certificate.Id.ToString(), Id.ToString());
transaction.Commit();
return authorityIndex;
}
