Fix comment permissions (#28213)

This PR will fix some missed checks for private repositories' data on
web routes and API routes.

1 files changed, 54 insertions, 2 deletions

diff --git a/routers/api/v1/repo/issue_comment.go b/routers/api/v1/repo/issue_comment.go
index c718424f7e..4db2c68a79 100644
--- a/routers/api/v1/repo/issue_comment.go
+++ b/routers/api/v1/repo/issue_comment.go
@@ -12,9 +12,11 @@ import (
 	issues_model "code.gitea.io/gitea/models/issues"
 	access_model "code.gitea.io/gitea/models/perm/access"
 	repo_model "code.gitea.io/gitea/models/repo"
+	"code.gitea.io/gitea/models/unit"
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/context"
 	api "code.gitea.io/gitea/modules/structs"
+	"code.gitea.io/gitea/modules/util"
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/routers/api/v1/utils"
 	"code.gitea.io/gitea/services/convert"
@@ -71,6 +73,11 @@ func ListIssueComments(ctx *context.APIContext) {
 		ctx.Error(http.StatusInternalServerError, "GetRawIssueByIndex", err)
 		return
 	}
+	if !ctx.Repo.CanReadIssuesOrPulls(issue.IsPull) {
+		ctx.NotFound()
+		return
+	}
+
 	issue.Repo = ctx.Repo.Repository
 
 	opts := &issues_model.FindCommentsOptions{
@@ -271,12 +278,27 @@ func ListRepoIssueComments(ctx *context.APIContext) {
 		return
 	}
 
+	var isPull util.OptionalBool
+	canReadIssue := ctx.Repo.CanRead(unit.TypeIssues)
+	canReadPull := ctx.Repo.CanRead(unit.TypePullRequests)
+	if canReadIssue && canReadPull {
+		isPull = util.OptionalBoolNone
+	} else if canReadIssue {
+		isPull = util.OptionalBoolFalse
+	} else if canReadPull {
+		isPull = util.OptionalBoolTrue
+	} else {
+		ctx.NotFound()
+		return
+	}
+
 	opts := &issues_model.FindCommentsOptions{
 		ListOptions: utils.GetListOptions(ctx),
 		RepoID:      ctx.Repo.Repository.ID,
 		Type:        issues_model.CommentTypeComment,
 		Since:       since,
 		Before:      before,
+		IsPull:      isPull,
 	}
 
 	comments, err := issues_model.FindComments(ctx, opts)
@@ -367,6 +389,11 @@ func CreateIssueComment(ctx *context.APIContext) {
 		return
 	}
 
+	if !ctx.Repo.CanReadIssuesOrPulls(issue.IsPull) {
+		ctx.NotFound()
+		return
+	}
+
 	if issue.IsLocked && !ctx.Repo.CanWriteIssuesOrPulls(issue.IsPull) && !ctx.Doer.IsAdmin {
 		ctx.Error(http.StatusForbidden, "CreateIssueComment", errors.New(ctx.Tr("repo.issues.comment_on_locked")))
 		return
@@ -436,6 +463,11 @@ func GetIssueComment(ctx *context.APIContext) {
 		return
 	}
 
+	if !ctx.Repo.CanReadIssuesOrPulls(comment.Issue.IsPull) {
+		ctx.NotFound()
+		return
+	}
+
 	if comment.Type != issues_model.CommentTypeComment {
 		ctx.Status(http.StatusNoContent)
 		return
@@ -555,7 +587,17 @@ func editIssueComment(ctx *context.APIContext, form api.EditIssueCommentOption)
 		return
 	}
 
-	if !ctx.IsSigned || (ctx.Doer.ID != comment.PosterID && !ctx.Repo.IsAdmin()) {
+	if err := comment.LoadIssue(ctx); err != nil {
+		ctx.Error(http.StatusInternalServerError, "LoadIssue", err)
+		return
+	}
+
+	if comment.Issue.RepoID != ctx.Repo.Repository.ID {
+		ctx.Status(http.StatusNotFound)
+		return
+	}
+
+	if !ctx.IsSigned || (ctx.Doer.ID != comment.PosterID && !ctx.Repo.CanWriteIssuesOrPulls(comment.Issue.IsPull)) {
 		ctx.Status(http.StatusForbidden)
 		return
 	}
@@ -658,7 +700,17 @@ func deleteIssueComment(ctx *context.APIContext) {
 		return
 	}
 
-	if !ctx.IsSigned || (ctx.Doer.ID != comment.PosterID && !ctx.Repo.IsAdmin()) {
+	if err := comment.LoadIssue(ctx); err != nil {
+		ctx.Error(http.StatusInternalServerError, "LoadIssue", err)
+		return
+	}
+
+	if comment.Issue.RepoID != ctx.Repo.Repository.ID {
+		ctx.Status(http.StatusNotFound)
+		return
+	}
+
+	if !ctx.IsSigned || (ctx.Doer.ID != comment.PosterID && !ctx.Repo.CanWriteIssuesOrPulls(comment.Issue.IsPull)) {
 		ctx.Status(http.StatusForbidden)
 		return
 	} else if comment.Type != issues_model.CommentTypeComment {