{"record":{"id":"4cf5bf8813ed58f3","repo":"router-for-me/CLIProxyAPI","slug":"failed-to-generate-code-verifier-w-4cf5bf","errorCode":null,"errorMessage":"failed to generate code verifier: %w","messagePattern":"failed to generate code verifier: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"internal/auth/codex/pkce.go","lineNumber":21,"sourceCode":"// code generation for secure authentication flows.\npackage codex\n\nimport (\n\t\"crypto/rand\"\n\t\"crypto/sha256\"\n\t\"encoding/base64\"\n\t\"fmt\"\n)\n\n// GeneratePKCECodes generates a new pair of PKCE (Proof Key for Code Exchange) codes.\n// It creates a cryptographically random code verifier and its corresponding\n// SHA256 code challenge, as specified in RFC 7636. This is a critical security\n// feature for the OAuth 2.0 authorization code flow.\nfunc GeneratePKCECodes() (*PKCECodes, error) {\n\t// Generate code verifier: 43-128 characters, URL-safe\n\tcodeVerifier, err := generateCodeVerifier()\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"failed to generate code verifier: %w\", err)\n\t}\n\n\t// Generate code challenge using S256 method\n\tcodeChallenge := generateCodeChallenge(codeVerifier)\n\n\treturn &PKCECodes{\n\t\tCodeVerifier:  codeVerifier,\n\t\tCodeChallenge: codeChallenge,\n\t}, nil\n}\n\n// generateCodeVerifier creates a cryptographically secure random string to be used\n// as the code verifier in the PKCE flow. The verifier is a high-entropy string\n// that is later used to prove possession of the client that initiated the\n// authorization request.\nfunc generateCodeVerifier() (string, error) {\n\t// Generate 96 random bytes (will result in 128 base64 characters)\n\tbytes := make([]byte, 96)","sourceCodeStart":3,"sourceCodeEnd":39,"githubUrl":"https://github.com/router-for-me/CLIProxyAPI/blob/78f0c4079e3e6273d65d03b5549cffc898703264/internal/auth/codex/pkce.go#L3-L39","documentation":"GeneratePKCECodes could not produce a code verifier, wrapping the failure from generateCodeVerifier (crypto/rand read failure). This runs at the very start of every Codex login, so it aborts the flow before any browser interaction. In practice the only realistic cause is the wrapped random-bytes error (213) — entropy or rand.Reader unavailability.","triggerScenarios":"rand.Read returning an error (see 213); a test or embedder replacing rand.Reader with a failing reader; extremely constrained container runtimes without getrandom(2).","commonSituations":"Exotic minimal containers/VMs lacking entropy sources; custom builds that stub out crypto/rand; essentially never on mainstream Linux/macOS.","solutions":["Treat it as an environment problem: verify /dev/urandom (or getrandom) is available inside the container.","Remove any test stubs overriding rand.Reader.","If the runtime genuinely lacks entropy early at boot, retry login after the system has run for a moment.","As a last resort on broken hosts, upgrade the kernel/runtime."],"exampleFix":null,"handlingStrategy":"try-catch","validationCode":null,"typeGuard":null,"tryCatchPattern":"codes, err := pkce.GeneratePKCECodes()\nif err != nil {\n    // crypto/entropy problem: environment-level fix required (see rand.Read)\n    log.Errorf(\"cannot generate PKCE (rand unavailable?): %v\", err)\n    return err\n}","preventionTips":["Verify /dev/urandom and getrandom(2) work in the target container before shipping.","Do not stub crypto/rand.Reader outside tests."],"tags":["oauth","codex","pkce","crypto","auth-flow"],"backgroundTag":null,"analyzedSha":"78f0c4079e3e6273d65d03b5549cffc898703264","analyzedAt":"2026-08-15T12:26:37.444Z","schemaVersion":2},"datasetVersion":"2026-08-15T17:31:12.345Z"}