protected void Page_Load(object sender, EventArgs e)
{
// Get userfile from query string.
var userfile = Request.QueryString["userfile"];
// Our action only works if a userfile is given to work with.
if (string.IsNullOrEmpty(userfile))
{
// Return "Not Found" HTTP response.
Response.StatusCode = 404;
Response.End();
return;
}
// Read document from storage.
var fileContent = Storage.GetFile(userfile);
// Open an validate signatures with PKI SDK based on the PAdES Basic policy.
var signature = Lacuna.Pki.Pades.PadesSignature.Open(fileContent);
var policyMapper = PadesPoliciesForGeneration.GetPadesBasic(Util.GetTrustArbitrator());
// Generate a model to be shown on the page from the PadesSignature instance computed from Open()
// method above. This class can be inspected on SignatureModels.cs file. In this class, we validate
// each signature based on the policy mapper defined above.
var model = new PadesSignatureModel(signature, policyMapper);
// Set property for rendering on page (see aspx file).
this.Model = model;
}
/// <summary>
/// This method defines the signature policy that will be used on the signature.
/// </summary>
private ICadesPolicyMapper getSignaturePolicy()
{
var policy = CadesPoliciesForGeneration.GetPkiBrazilAdrBasica();
#if DEBUG
// During debug only, we return a wrapper which will overwrite the policy's default trust
// arbitrator (which in this case corresponds to the ICP-Brasil roots only), with our custom trust
// arbitrator which accepts test certificates (see Util.GetTrustArbitrator()).
return(new CadesPolicyMapperWrapper(policy, Util.GetTrustArbitrator()));
#else
return(policy);
#endif
}
/// <summary>
/// This method defines the signature policy that will be used on the signature.
/// </summary>
private XmlPolicySpec getSignaturePolicy()
{
var policy = BrazilXmlPolicySpec.GetNFePadraoNacional();
#if DEBUG
// During debug only, we clear the policy's default trust arbitrator (which, in the case of
// the policy returned by BrazilXmlPolicySpec.GetNFePadraoNacional(), corresponds to the ICP-Brasil
// roots only), and use our custom trust arbitrator which accepts test certificates
// (see Util.GetTrustArbitrator())
policy.ClearTrustArbitrators();
policy.AddTrustArbitrator(Util.GetTrustArbitrator());
#endif
return(policy);
}
protected void Page_Load(object sender, EventArgs e)
{
// Get verification code from query string.
var formattedVerificationCode = Request.QueryString["c"];
// On PrinterFriendlyVersion.aspx, we stored the unformatted version of the verification code
// (without hyphens) but used the formatted version (with hyphens) on the printer-friendly PDF. Now,
// we remove the hyphens before looking it up.
var verificationCode = AlphaCode.Parse(formattedVerificationCode);
// Get document associated with verification code.
var fileId = Storage.LookupVerificationCode(verificationCode);
if (fileId == null)
{
// Invalid code given!
// Small delay to slow down brute-force attacks (if you want to be extra careful you might want
// to add a CAPTCHA to the process).
Thread.Sleep(TimeSpan.FromSeconds(2));
// Return "Not Found" HTTP response.
Response.StatusCode = 404;
Response.End();
return;
}
// Read document from storage.
var fileContent = Storage.GetFile(fileId);
// Open and validate signatures with PKI SDK based on the PAdES Basic policy.
var signature = Lacuna.Pki.Pades.PadesSignature.Open(fileContent);
var policyMapper = PadesPoliciesForGeneration.GetPadesBasic(Util.GetTrustArbitrator());
// Generate a model to be shown on the page from the PadesSignature instance computed from Open()
// method above. This class can be inspected on SignatureModels.cs file. In this class, we validate
// each signature based on the policy mapper defined above.
var model = new PadesSignatureModel(signature, policyMapper);
// Set properties for rendering on page (see aspx file).
this.FileId = fileId;
this.Model = model;
}
protected void SubmitButton_Click(object sender, EventArgs e)
{
var nonceStore = Util.GetNonceStore();
var certAuth = new PKCertificateAuthentication(nonceStore);
PKCertificate certificate;
var vr = certAuth.Complete(Convert.FromBase64String(NonceField.Value), Convert.FromBase64String(CertificateField.Value), Convert.FromBase64String(SignatureField.Value), Util.GetTrustArbitrator(), out certificate);
if (!vr.IsValid)
{
vr.Errors.ForEach(ve => ModelState.AddModelError("", ve.ToString()));
startNewAuth();
return;
}
this.AuthenticatedCertificate = certificate;
this.ValidationResults = vr;
Server.Transfer("AuthenticationSuccess.aspx");
}
/// <summary>
/// This method defines the signature policy that will be used on the signature.
/// </summary>
private IPadesPolicyMapper getSignaturePolicy()
{
return(PadesPoliciesForGeneration.GetPadesBasic(Util.GetTrustArbitrator()));
}
private byte[] generatePrinterFriendlyVersion(byte[] pdfContent, string verificationCode)
{
// The verification code is generated without hyphens to save storage space and avoid copy-and-paste
// problems. On the PDF generation, we use the "formatted" version, with hyphens (which will later
// be discarded on the verification page).
var formattedVerificationCode = AlphaCode.Format(verificationCode);
// Build the verification link from the constant "VerificationLinkFormat" (see above) and the
// formatted verification code.
var verificationLink = string.Format(VerificationLinkFormat, formattedVerificationCode);
// 1. Inspect signatures on the PDF.
var signature = Lacuna.Pki.Pades.PadesSignature.Open(pdfContent);
// 2. Create PDF with verification information from the signed PDF.
var pdfMarker = new PdfMarker();
// Build string with joined names of signers (see method getDisplayName() below).
var signerNames = Util.JoinStringsPt(signature.Signers.Select(s => getDisplayName(s.Signer.SigningCertificate)));
var allPagesMessage = string.Format("This document was digitally signed by {0}.\nTo verify the signatures go to {1} on {2} and inform the code {3}", signerNames, VerificationSiteNameWithArticle, VerificationSite, formattedVerificationCode);
// ICP-Brasil logo on bottom-right corner of every page (except on the page which will be created at
// the end of the document).
pdfMarker.AddMark(new PdfMark()
{
PageOption = PdfMarkPageOptions.AllPages,
Container = new PadesVisualRectangle()
{
Width = 1,
Right = 1,
Height = 1,
Bottom = 1
},
Elements = new List <PdfMarkElement>()
{
new PdfMarkImage()
{
ImageContent = Storage.GetIcpBrasilLogoContent(),
Opacity = 75
}
}
});
// Summary on bottom margin of every page (except on the page which will be created at the end of
// the document).
pdfMarker.AddMark(new PdfMark()
{
PageOption = PdfMarkPageOptions.AllPages,
Container = new PadesVisualRectangle()
{
Height = 2,
Bottom = 0,
Left = 1.5,
Right = 3.5
},
Elements = new List <PdfMarkElement>()
{
new PdfMarkText()
{
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
Text = allPagesMessage
}
}
}
}
});
// Summary on right margin of every page (except on the page which will be created at the end of the
// document), rotated 90 degrees counterclockwise (text goes up).
pdfMarker.AddMark(new PdfMark()
{
PageOption = PdfMarkPageOptions.AllPages,
Container = new PadesVisualRectangle()
{
Width = 2,
Right = 0,
Top = 1.5,
Bottom = 3.5
},
Elements = new List <PdfMarkElement>()
{
new PdfMarkText()
{
Rotation = PdfMarkRotation.D90,
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
Text = allPagesMessage
}
}
}
}
});
// Create a "manifest" mark on a new page added on the end of the document. We'll add several
// elements to this marks.
var manifestMark = new PdfMark()
{
PageOption = PdfMarkPageOptions.NewPage,
// This mark's container is the whole page with 1-inch margins.
Container = new PadesVisualRectangle()
{
Top = 2.54,
Bottom = 2.54,
Right = 2.54,
Left = 2.54
}
};
// We'll keep track of our "vertical offset" as we add elements to the mark.
double verticalOffset = 0;
double elementHeight;
elementHeight = 3;
// ICP-Brasil logo on the upper-left corner.
manifestMark.Elements.Add(new PdfMarkImage()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Width = elementHeight, /* Using elemengHeight as width because the image is square. */
Left = 0
},
ImageContent = Storage.GetIcpBrasilLogoContent()
});
// QR Code with the verification link on the upper-right corner. We will generate a PdfMarkImage from
// a QR Code generated using the QRCoder library.
byte[] qrCodeImageContent;
using (var qrGenerator = new QRCodeGenerator()) {
using (var qrCodeData = qrGenerator.CreateQrCode(verificationLink, QRCodeGenerator.ECCLevel.M)) {
using (var qrCode = new QRCode(qrCodeData)) {
var qrCodeBitmap = qrCode.GetGraphic(10, Color.Black, Color.White, false);
using (var buffer = new MemoryStream()) {
qrCodeBitmap.Save(buffer, ImageFormat.Png);
qrCodeImageContent = buffer.ToArray();
};
}
}
}
manifestMark.Elements.Add(new PdfMarkImage()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Width = elementHeight, /* Using elemengHeight as width because the image is square. */
Right = 0
},
ImageContent = qrCodeImageContent
});
// Header "SIGNATURES VERIFICATION" centered between ICP-Brasil logo and QR Code.
manifestMark.Elements.Add(new PdfMarkText()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset + 0.2,
Right = 0,
Left = 0
},
Align = PadesHorizontalAlign.Center,
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize * 1.6,
Text = "SIGNATURES\nVERIFICATION"
}
}
});
verticalOffset += elementHeight;
// Verifical padding.
verticalOffset += 1.7;
// Header with verification code.
elementHeight = 2;
manifestMark.Elements.Add(new PdfMarkText()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Right = 0,
Left = 0
},
Align = PadesHorizontalAlign.Center,
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize * 1.2,
Text = string.Format("Verification Code: {0}", formattedVerificationCode)
}
}
});
verticalOffset += elementHeight;
// Paragraph saying "this document was signed by the following signer etc" and mentioning the time zone of the
// date/times below.
elementHeight = 2.5;
manifestMark.Elements.Add(new PdfMarkText()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Left = 0,
Right = 0
},
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize,
Text = string.Format("This document was digitally signed by the following signers on the indicated dates ({0}):", TimeZoneDisplayName)
}
}
});
verticalOffset += elementHeight;
// Iterate signers.
foreach (var signer in signature.Signers)
{
elementHeight = 1.5;
// Validate signature based on the PAdES Basic policy.
var policyMapper = PadesPoliciesForGeneration.GetPadesBasic(Util.GetTrustArbitrator());
var validationResults = signature.ValidateSignature(signer, policyMapper);
// Green "check" or red "X" icon depending on result of validation for this signer.
manifestMark.Elements.Add(new PdfMarkImage()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = 0.5,
Top = verticalOffset + 0.2,
Width = 0.5,
Left = 0
},
ImageContent = Storage.GetValidationResultIcon(validationResults.IsValid)
});
// Description of signer (see method getSignerDescription() below).
manifestMark.Elements.Add(new PdfMarkText()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Left = 0.8,
Right = 0
},
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize,
Text = getSignerDescription(signer)
}
}
});
verticalOffset += elementHeight;
}
// Some vertical padding from last signer.
verticalOffset += 1;
// Paragraph with link to veritifcation site and citing both the verification code above and the
// verification link below.
elementHeight = 2.5;
manifestMark.Elements.Add(new PdfMarkText()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Right = 0,
Left = 0
},
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize,
Text = string.Format("To verify the signatures, go to {0} on ", VerificationSiteNameWithArticle)
},
new PdfTextSection()
{
Color = Color.Blue,
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize,
Text = VerificationSite
},
new PdfTextSection()
{
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize,
Text = " and inform the code above or follow the link below:"
}
}
});
verticalOffset += elementHeight;
// Verification link.
elementHeight = 1.5;
manifestMark.Elements.Add(new PdfMarkText()
{
RelativeContainer = new PadesVisualRectangle()
{
Height = elementHeight,
Top = verticalOffset,
Right = 0,
Left = 0
},
Align = PadesHorizontalAlign.Center,
Texts = new List <PdfTextSection>()
{
new PdfTextSection()
{
Color = Color.Blue,
Style = PdfTextStyle.Normal,
FontSize = NormalFontSize,
Text = verificationLink
}
}
});
pdfMarker.AddMark(manifestMark);
// Prevent from throwing exception when the file to be marked already have a signature (default: true).
pdfMarker.ThrowIfSignedPdf = false;
// Note: Before applying the marks, all signature from the signed file will be removed.
// Apply marks and return the printer-friendly PDF's content.
byte[] pfvContent = pdfMarker.WriteMarks(pdfContent);
return(pfvContent);
}