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connector/github: abstract scope check and group getter

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This commit is contained in:
Eric Stroczynski 2017-08-18 11:04:12 -07:00
parent e761f1eacd
commit 913a03f1a2
1 changed files with 43 additions and 47 deletions
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78
connector/github/github.go
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@ -25,7 +25,10 @@ import (
const (
apiURL = "https://api.github.com"
// GitHub requires this scope to access '/user' and '/user/emails' API endpoints.
scopeEmail = "user:email"
// GitHub requires this scope to access '/user/teams' and '/orgs' API endpoints
// which are used when a client includes the 'groups' scope.
scopeOrgs = "read:org"
)
@ -133,12 +136,19 @@ type githubConnector struct {
httpClient *http.Client
}
// groupsRequired returns whether dex requires GitHub's 'read:org' scope. Dex
// needs 'read:org' if 'orgs' or 'org' fields are populated in a config file.
// Clients can require 'groups' scope without setting 'orgs'/'org'.
func (c *githubConnector) groupsRequired(groupScope bool) bool {
return len(c.orgs) > 0 || c.org != "" || groupScope
}
func (c *githubConnector) oauth2Config(scopes connector.Scopes) *oauth2.Config {
var githubScopes []string
if scopes.Groups {
githubScopes = []string{scopeEmail, scopeOrgs}
} else {
githubScopes = []string{scopeEmail}
// 'read:org' scope is required by the GitHub API, and thus for dex to ensure
// a user is a member of orgs and teams provided in configs.
githubScopes := []string{scopeEmail}
if c.groupsRequired(scopes.Groups) {
githubScopes = append(githubScopes, scopeOrgs)
}
endpoint := github.Endpoint
@ -244,24 +254,12 @@ func (c *githubConnector) HandleCallback(s connector.Scopes, r *http.Request) (i
EmailVerified: true,
}
if s.Groups {
var groups []string
if len(c.orgs) > 0 {
if groups, err = c.listGroups(ctx, client, user.Login); err != nil {
return identity, err
}
} else if c.org != "" {
inOrg, err := c.userInOrg(ctx, client, user.Login, c.org)
// Only set identity.Groups if 'orgs', 'org', or 'groups' scope are specified.
if c.groupsRequired(s.Groups) {
groups, err := c.getGroups(ctx, client, s.Groups, user.Login)
if err != nil {
return identity, err
}
if !inOrg {
return identity, fmt.Errorf("github: user %q not a member of org %q", user.Login, c.org)
}
if groups, err = c.teams(ctx, client, c.org); err != nil {
return identity, fmt.Errorf("github: get teams: %v", err)
}
}
identity.Groups = groups
}
@ -300,37 +298,35 @@ func (c *githubConnector) Refresh(ctx context.Context, s connector.Scopes, ident
identity.Username = username
identity.Email = user.Email
if s.Groups {
var groups []string
if len(c.orgs) > 0 {
if groups, err = c.listGroups(ctx, client, user.Login); err != nil {
return identity, err
}
} else if c.org != "" {
inOrg, err := c.userInOrg(ctx, client, user.Login, c.org)
// Only set identity.Groups if 'orgs', 'org', or 'groups' scope are specified.
if c.groupsRequired(s.Groups) {
groups, err := c.getGroups(ctx, client, s.Groups, user.Login)
if err != nil {
return identity, err
}
if !inOrg {
return identity, fmt.Errorf("github: user %q not a member of org %q", user.Login, c.org)
}
if groups, err = c.teams(ctx, client, c.org); err != nil {
return identity, fmt.Errorf("github: get teams: %v", err)
}
}
identity.Groups = groups
}
return identity, nil
}
// listGroups enforces org and team constraints on user authorization
// getGroups retrieves GitHub orgs and teams a user is in, if any.
func (c *githubConnector) getGroups(ctx context.Context, client *http.Client, groupScope bool, userLogin string) ([]string, error) {
if len(c.orgs) > 0 {
return c.groupsForOrgs(ctx, client, userLogin)
} else if c.org != "" {
return c.teamsForOrg(ctx, client, c.org)
}
return nil, nil
}
// groupsForOrgs enforces org and team constraints on user authorization
// Cases in which user is authorized:
// N orgs, no teams: user is member of at least 1 org
// N orgs, M teams per org: user is member of any team from at least 1 org
// N-1 orgs, M teams per org, 1 org with no teams: user is member of any team
// from at least 1 org, or member of org with no teams
func (c *githubConnector) listGroups(ctx context.Context, client *http.Client, userName string) (groups []string, err error) {
func (c *githubConnector) groupsForOrgs(ctx context.Context, client *http.Client, userName string) (groups []string, err error) {
var inOrgNoTeams bool
for _, org := range c.orgs {
inOrg, err := c.userInOrg(ctx, client, userName, org.Name)
@ -341,7 +337,7 @@ func (c *githubConnector) listGroups(ctx context.Context, client *http.Client, u
continue
}
teams, err := c.teams(ctx, client, org.Name)
teams, err := c.teamsForOrg(ctx, client, org.Name)
if err != nil {
return groups, err
}
@ -560,11 +556,11 @@ type team struct {
} `json:"organization"`
}
// teams queries the GitHub API for team membership within a specific organization.
// teamsForOrg queries the GitHub API for team membership within a specific organization.
//
// The HTTP passed client is expected to be constructed by the golang.org/x/oauth2 package,
// which inserts a bearer token as part of the request.
func (c *githubConnector) teams(ctx context.Context, client *http.Client, orgName string) ([]string, error) {
func (c *githubConnector) teamsForOrg(ctx context.Context, client *http.Client, orgName string) ([]string, error) {
apiURL, groups := c.apiURL+"/user/teams", []string{}
for {
// https://developer.github.com/v3/orgs/teams/#list-user-teams
@ -573,7 +569,7 @@ func (c *githubConnector) teams(ctx context.Context, client *http.Client, orgNam
err error
)
if apiURL, err = get(ctx, client, apiURL, &teams); err != nil {
return nil, err
return nil, fmt.Errorf("github: get teams: %v", err)
}
for _, team := range teams {